Registration Dossier

Administrative data

Endpoint:
two-generation reproductive toxicity
Remarks:
based on test type (migrated information)
Type of information:
migrated information: read-across based on grouping of substances (category approach)
Adequacy of study:
key study
Study period:
17 Nov 2003 - 18 Jul 2004
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: GLP-Guideline study with acceptable restrictions. Lack of test material details.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2005
Report Date:
2005

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 416 (Two-Generation Reproduction Toxicity Study)
Deviations:
yes
Remarks:
lack of test material details.
GLP compliance:
yes (incl. certificate)
Remarks:
Freie und Hansestadt Hamburg, Behörde für Wissenschaft und Gesundheit, Hamburg, Germany
Limit test:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): only trade name given
- Physical state: light yellow liquid
- Analytical purity: no data
- Lot/batch No.: 303091
- Expiration date of the lot/batch: 02.2006
- Density: 20 °C: 0.908 g/cm³ (LPT identification)
- Storage conditions: at room temperature

Test animals

Species:
rat
Strain:
other: CD® / Crl:CD®
Sex:
male/female
Details on test animals and environmental conditions:
TEST ANIMALS
- Source: Charles River Deutschland GmbH, Sulzfeld, Germany
- Age at study initiation: (P) 40-47 days (males/females)
- Weight at study initiation: (P) 164.0 - 206.3 g (males) and 139.9 - 176.1 g (females)
- Housing: pre-mating animals and the pregnant females were housed individually, the rearing females were housed together with their pups and the mating animals were kept as pairs in Makrolon type III cages. Coarse granulated wood (Brandenburg, Goldenstedt-Arkeburg, Germany) was used as bedding material.
- Diet: ssniff R-Z V1324 (ssniff Spezialdiäten GmbH, Soest, Germany), ad libitum
- Water: tap water, ad libitum
- Acclimation period: 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22 ± 2
- Humidity (%): 55 ± 15
- Photoperiod (hrs dark / hrs light): 12/12

Administration / exposure

Route of administration:
oral: gavage
Vehicle:
corn oil
Details on exposure:
PREPARATION OF DOSING SOLUTIONS: once daily, 7 days/week

VEHICLE
- Amount of vehicle: 2 mL/kg bw
- Lot/batch no.: 31107453
Details on mating procedure:
- M/F ratio per cage: 1/1
- Length of cohabitation: until copulation occurred or 2 weeks had elapsed
- Proof of pregnancy: vaginal plug / sperm in vaginal smear referred to as Day 0 of pregnancy
- After 14 days of unsuccessful pairing the animals were separated without further opportunity for mating.
- After successful mating each pregnant female was caged: individually
Analytical verification of doses or concentrations:
yes
Details on analytical verification of doses or concentrations:
The determination of the test substance in corn oil mixtures was performed applying a GC method with FID detection. The test substance was quantified applying a reference standard. The following parameters were determined: linearity, accuracy, precision, sensitivity, specificity and stability. The results of the analysis showed that the test item vehicle mixtures were correctly prepared and the concentration and stability found were in good agreement to those expected. The actual concentrations of the test item-carrier mixtures were within the measured range of 97.4-104.7% of the nominal test item concentrations.
Duration of treatment / exposure:
(F0) Males: 10 weeks before mating, 2 weeks during mating.
(F0) Females: 10 weeks before mating, up to 2 weeks during mating, approximately 3 weeks during pregnancy, 3 weeks during lactation.
(F1) Males: 10 weeks before mating, 2 weeks during mating.
(F1) Females: 10 weeks before mating, up to 2 weeks during mating, approximately 3 weeks during pregnancy, 3 weeks during lactation.
Frequency of treatment:
daily, 7 days/week
Details on study schedule:
- F1 parental animals not mated until at least 10 weeks after selected from the F1 litters.
- Selection of parents from F1 generation when pups were 3 weeks of age.
Doses / concentrations
Remarks:
Doses / Concentrations:
100, 300 and 1000 mg/kg bw/day
Basis:
nominal conc.
No. of animals per sex per dose:
20
Control animals:
yes, concurrent vehicle
Details on study design:
- Dose selection rationale: The dose levels for this study were selected in agreement with the sponsor based on available toxicity data.

Examinations

Parental animals: Observations and examinations:
CAGE SIDE OBSERVATIONS: Yes
- Time schedule: twice daily

DETAILED CLINICAL OBSERVATIONS: Yes
- Time schedule: daily

BODY WEIGHT: Yes
- Time schedule for examinations: Parental animals (F0 and F1) were weighed on the first day of dosing and at least weekly thereafter. Parental females (F0 and F1) were weighed daily during gestation and during lactation on the same days as the weighing of litters and on the day the animals were sacrificed.

FOOD CONSUMPTION AND COMPOUND INTAKE:
- Food consumption for each animal was determined weekly during the pre-mating period and daily during the gestation periods. After parturition and during lactation, food consumption measurements were performed on the same day as the weighing of the litters.
Oestrous cyclicity (parental animals):
Oestrous cycle length and normality were evaluated in F0 and F1 females by vaginal smear 3 weeks prior to mating until evidence of mating was found. When obtaining vaginal/cervical cells, care was taken to avoid disturbance of mucosa and subsequently, the induction of pseudopregnancy.
Sperm parameters (parental animals):
Parameters examined in [F0/F1] male parental generations: testis weight, epididymis weight and one of each paired organ was reserved for histopathological examination. Of a subset of at least 10 males of each group, the remaining testes and epididymides were used for enumeration of ultra-sound resistant (homogenisation-resistant) spermatids and cauda epididymides sperm reserves, respectively. From the same groups, sperm motility and sperm morphology was determined.
Litter observations:
STANDARDISATION OF LITTERS
- Performed on day 4 postpartum: no

PARAMETERS EXAMINED
The following parameters were examined in [F1 / F2 ] offspring: number and sex of pups, weight, presence of milk in the stomach, externally visible abnormalities, stillbirths.
- Functional development: mid-air righting reflex, auditory startle reflex, pupillary reflex, open field, passive avoidance learning and memory.
- Physical development: pinna detachment, ear and eye opening, cleavage of the balanopreputial gland, vaginal opening, upper incisor eruption.

GROSS EXAMINATION OF DEAD PUPS:
yes, all pups with external abnormalities or clinical signs and at least one randomly selected pup/sex/litter from F1 and F2 generation, were examined macroscopically for any structural abnormalities or pathological changes.
Postmortem examinations (parental animals):
SACRIFICE
- Male animals: All surviving animals at the end of the mating period
- Maternal animals: All surviving animals after 3 lactation weeks

GROSS NECROPSY
- Gross necropsy consisted of external surfaces, orifices, cranila cavity, carcass and all organs. Special attention was paid to the organs of the reproductive system.

HISTOPATHOLOGY / ORGAN WEIGHTS
The following tissues were prepared for microscopic examination: adrenal glands, coagulation gland, epididymides, grossly abnormal tissue, ovary, pituitary, prostate, seminal vesicle, testicle, uterus (with oviducts and cervix) and vagina.
The following organs were weighed: adrenal glands, brain, epididymides, kidney, liver, ovary, pituitary, prostate, seminal vesicle, spleen, testicle, thyroid and uterus (with oviducts and cervix).
Postmortem examinations (offspring):
SACRIFICE
- The F1 offspring not selected as parental animals or selected for open field and passive avoidance testes and all F2 offspring were sacrificed after 3 lactation weeks.
- These animals were subjected to postmortem examinations macroscopic and microscopic examination as follows: full histopathology of the organs were performed for all high dose and control F1 parental animals per sex.

GROSS NECROPSY
- Gross necropsy consisted of grossly abnormal tissue.

HISTOPATHOLOGY
- Grossly abnormal tissue from all pups with external abnormalities or clinical signs, as well as from at least one randomly selected pup/sex/litter from F1 and F2 generation were fixed for possible histopathological examinations. In F1 females evaluation of Corpora lutea of lactation in ovaries was performed.
Statistics:
For all numerical values homogeneity of variances was tested by using the BARTLETT chi-square test. If the variances were homogenous, the DUNNETT test (p ≤ 0.01) was used to compare the experimental groups with the control group.
In case of heterogeneity of variances, the STUDENT´s t-test was carried out, limit of significance was p ≤ 0.01.
For the comparison of classification measurements the FISHER´s exact test (≤ 0.05), n < 100 or chi²-test with Yates´correction for continuity, n ≥ 100 (p ≤ 0.01) was employed.
Reproductive indices:
For each group the following calculations were performed:
- Fertility female index: (number of pregnancies/number of matings) x 100
- Gestation index: (number of litters with live pups/number of pregnancies) x 100

For each litter and group the following calculations were performed:
- Live-born index: (number of pups born alive/total number of pups born) x 100
- Lactation index: (number of pups alive on Day 21/number of pups alive on Day 4) x 100
- Sex ratio: number of males/number of females
- Percentage by Sex: number of males (females)/total number of animals x 100
- Viability index: (number of pups alive on Day 4/number of pups alive and kept on Day 0) x 100
Offspring viability indices:
For each litter and group the following calculations were performed:
- Live-born index: (number of pups born alive/total number of pups born) x 100
- Lactation index: (number of pups alive on Day 21/number of pups alive on Day 4) x 100
- Sex ratio: number of males/number of females
- Percentage by Sex: number of males (females)/total number of animals x 100
- Viability index: (number of pups alive on Day 4/number of pups alive and kept on Day 0) x 100

Results and discussion

Results: P0 (first parental generation)

General toxicity (P0)

Clinical signs:
no effects observed
Body weight and weight changes:
effects observed, treatment-related
Description (incidence and severity):
F0: Low-/mid-dose (f): increased body weight gain; high-dose (f): decreased body weight gain, low-dose (f): increased food consumption, non-adverse; F1: mid-dose (f): decreased body weight; high-dose (f): increased body weight, non-adverse
Food consumption and compound intake (if feeding study):
effects observed, treatment-related
Description (incidence and severity):
F0: Low-/mid-dose (f): increased body weight gain; high-dose (f): decreased body weight gain, low-dose (f): increased food consumption, non-adverse; F1: mid-dose (f): decreased body weight; high-dose (f): increased body weight, non-adverse
Organ weight findings including organ / body weight ratios:
effects observed, treatment-related
Histopathological findings: non-neoplastic:
no effects observed

Reproductive function / performance (P0)

Reproductive function: oestrous cycle:
no effects observed
Reproductive function: sperm measures:
no effects observed
Reproductive performance:
effects observed, treatment-related
Description (incidence and severity):
F0: mid- and high dose: reduced live-born indices; high-dose: increased post-implantation loss and prolonged gestation length, non-adverse; F1: high-dose (f): increased fertility index, non-adverse

Details on results (P0)

CLINICAL SIGNS AND MORTALITY (PARENTAL ANIMALS)
F0: No mortality and no signs of systemic toxicity were observed.
F1: No mortality and no signs of systemic toxicity were observed.

BODY WEIGHT (PARENTAL ANIMALS)
F0: No influence was noted on the body weight and the body weight gain of the male rats during the pre-mating and mating period. Statistically significant increase in body weight gain during the pre-mating and mating period of the low- mid-dose female group were observed. Additionally, decrease of body weight gain during the gestation period was observed in the mid-dose group. The differences were not considered to be test item-related (Table 3 under "Any other information on results incl. tables").
F1: No influence was noted on the body weight and the body weight gain of the male rats during the pre-mating and mating period. In the mid-dose female group a decreased body weight gain and in the high and low-dose female group an increased body weight gain was apparent but not considered to be test-item related. A statistically significant increase in food consumption in the low- and high-dose female group was determined and was not considered to be test item-related.

FOOD CONSUMPTION (PARENTAL ANIMALS)
F0: No test item-related influence was observed on the food consumption or the food efficiency of the male animals treated with 100, 300 or 1000 mg/kg bw/day during the pre-mating period. A statistically significant increase in food consumption in the low dose female group was determined and was not considered to be test item-related.
F1: No test item-related influence was observed on the food consumption or the food efficiency of the male animals treated with 100, 300 or 1000 mg/kg bw/day during the pre-mating period.
No test item-related influence was observed on the food consumption or the food efficiency of the female animals treated with 100, 300 or 1000 mg/kg bw/day during the pre-mating, gestation or lactation period. Statistically significant increases in food consumption were observed in the high and low dose group in week 8 and week 20, respectively and were not considered to be test item-related.

REPRODUCTIVE FUNCTION: ESTROUS CYCLE (PARENTAL ANIMALS)
F0: No test item-related influence on the number or the length of the oestrous cycles was observed at any of the tested dose levels during the pre-mating and the mating period. No test item-related difference was noted for the number of abnormal cycles between the dose level groups and the control group.
F1: No test item-related influence on the number or the length of the oestrous cycles was observed at any of the tested dose levels during the pre-mating and the mating period. No test item-related difference was noted tor the number of abnormal cycles between the dose level groups compared to the control group.

REPRODUCTIVE FUNCTION: SPERM MEASURES (PARENTAL ANIMALS)
F0: No test item-related influence was noted on the male fertility of the animals.
The number of ultrasound-resistant spermatids per gram testicular tissue was not influenced at any of the tested dose levels. No test item related changes were noted in the percentage of motile spermatozoa in the epididymal cauda for the males treated with either 100, 300 or 1000 mg/kg bw/day. The mean percentage of morphologically normal spermatids was not different in the dosed males as compared to the control animals.
F1: No test item-related influence was noted on the male fertility of the animals. The number of ultrasound-resistant spermatids per gram testicular tissue was not influenced. No test item related changes were noted in the percentage of motile spermatozoa in the epididymal cauda for the males treated with either 100, 300 or 1000 mg/kg bw/day. The mean percentage of morphologically normal spermatids was not different in the dosed males as compared to the control animals.

REPRODUCTIVE PERFORMANCE (PARENTAL ANIMALS)
F0: In the high dose group an increased postimplantation loss (statistically significant at p ≤ 0.05) and a statistically (at p ≤ 0.01) significantly prolonged gestation length was observed. The value of post-implantation loss was slightly out of the range of the historical control data and was not considered to be of toxicological relevance. The marginally and not dose-related prolonged gestation length in the high dose group was 21.8 days compared to 21.2 days of the control group.The slight but statistically (at p ≤ 0.05) significantly reduced live-born indices at 300 or 1000 mg/kg bw/day were regarded to be spontaneous; the values were still within the background data of the testing laboratory. Furthermore, the reduced values in each group are based on one litter each only with no viable pups. In the high dose dam no. 171 revealed only one pup which was dead, in the intermediate dose dam no. 126 revealed a litter with 9 dead pups. If both litters are excluded from calculation, the mean live-born index is 98.8% for the intermediate dose group and 98.6% tor the high dose group. These values are within the range of the control group. No test item-related influence was noted for the number of implantation sites, pups at birth (alive and dead), runts or malformed pups, in the number of dams with runts or malformed pups as well as in the value calculated for the gestation index. No female aborted. No malformed pups ware noted. No test item-related influence was noted on the sex ratio, the percentage by sex and the survival indices (viability indices and lactation index) in any of the tested dose groups (see Table 1 and 5 under "Any other information on results incl. tables").
F1: No test substance-related influence on post-implantation loss and gestation length was observed in any animal.

SEXUAL MATURATION
F1: No test item-related influence was noted on the female fertility index of the animals treated with 100, 300 or 1000 mg/kg bw/day. The statistically significantly (at p ≤ 0.01) increased fertility index of the high dosed females is due to the relatively low fertility index of the control females and, therefore, of no biological relevance (see Table 1). No test item-related influence was noted on the pre-coital time of the females.
There were no test item-related differences between the control group and the treated animals in the number of implantation sites, pups at birth (alive and dead), stillbirths, live born pups, in the number of dams with stillborn pups, runts and malformed pups as well as in the values calculated for the gestation index, the gestation length, the live-born Index and the post-implantation loss. No female aborted.
No test item-related influence was noted on the sex ratio, the percentage by sex and the survival indices (viability indices and lactation index) in any of the tested dose groups.

ORGAN WEIGHTS (PARENTAL ANIMALS)
F0: In the high-dose females a statistically significant increase in relative organs weights of brain, spleen and pituitary were observed. These slight alterations in comparison to the control animals were without biological relevance. In the low dose female group, increased pituitary and uterus weight was observed and not considered to be test item-related. The respective absolute organ weights remained unchanged (see Table 2 under "Any other information on results incl. tables").
F1: No test item-related influence was noted tor the relative and absolute organ weights of male and female animals treated with 100, 300 or 1000 mg/kg bw/day. A slight but statistically significantly (at p ≤ 0.01) reduced relative organ weight of the left adrenal is regarded as spontaneous as the effect was observed for the left adrenal only.

GROSS PATHOLOGY (PARENTAL ANIMALS)
F0: Macroscopic inspections at necropsy revealed no test item-related changes in the organs or tissues of the animals treated with either 100, 300 or 1000 mg/kg bw/day (see Table 2 under "Any other information on results incl. tables").
F1: No test item-related changes were observed during necropsy.

HISTOPATHOLOGY (PARENTAL ANIMALS)
F0: The histomorphological examination of rats treated with the high-dose did not reveal any microscopical morphological changes which are considered to be related to the treatment with the test item. Type, incidence and severity of the lesions recorded were not increased in the treated animals as compared to the control animals. All lesions observed were interpreted as spontaneous organ changes and were thus not test item-related.
F1: The histopathological examination of the high-dose group did not reveal any morphological changes which are considered to be related to the test item. In F1 females unaffected Corpora lutea of lactation were present in ovaries of all females. No statistically significant difference was noted on the number of primordial and small growing follicles during examination of the ovaries.

Effect levels (P0)

open allclose all
Dose descriptor:
NOEL
Effect level:
300 mg/kg bw/day (nominal)
Based on:
test mat.
Sex:
female
Basis for effect level:
other: overall effects
Dose descriptor:
NOAEL
Effect level:
> 1 000 mg/kg bw/day (nominal)
Based on:
test mat.
Sex:
female
Basis for effect level:
other: Increased post-implantation loss and increased gestation length.

Results: F1 generation

General toxicity (F1)

Clinical signs:
no effects observed
Mortality / viability:
no mortality observed
Body weight and weight changes:
effects observed, treatment-related
Description (incidence and severity):
F1 (until weaning) high-dose (m, f): increased body weight
Sexual maturation:
no effects observed
Organ weight findings including organ / body weight ratios:
effects observed, treatment-related
Description (incidence and severity):
F1 (until weaning) low- and high-dose (f, m): decreased relative brain weight, non-adverse
Gross pathological findings:
effects observed, treatment-related
Description (incidence and severity):
F1 (until weaning) low- and high-dose: delayed ear opening; high dose (m, f): delayed pinna detachement and eye opening; mid- and high-dose (f): delayed vaginal opening, non-adverse
Histopathological findings:
no effects observed

Details on results (F1)

CLINICAL SIGNS AND MORTALITY (OFFSPRING)
F1/F2: No clinical signs and no mortality were reported.

DEVELOPMENTAL LANDMARKS (OFFSPRING)
F1: No test item-related influence was noted on the physical development. No delayed development was noted for the examined pinna detachment, upper incisor eruption, ear and eye opening.
Statistically significant differences in morphological landmarks which are not considered to be test item-related are listed in Table 4 under "Any other information on results incl. tables".

BODY WEIGHT (OFFSPRING)
F1: No test item-related influence was noted on the mean and total litter weight at any of the tested dose levels. Statistically significant differences in mean body weight where apparent for the following groups but were not considered to be test item-related: increase in mean body weight of the high dose females and males.
F2: No test item-related influence was noted on the mean and total litter weight at any of the tested dose levels.

ORGAN WEIGHTS (OFFSPRING)
F1: No test item-related influence was noted for the relative and absolute organ weights. A statistically significant (at p ≤ 0.01) decreased relative brain weight of the male and female pups of the low and high dose group is regarded to be due to the slightly increased body weight at autopsy observed for these dose groups.
F2: No test item-related influence was noted for the relative and absolute organ weights of the selected male and female F2 pups at any of the tested dose levels.

GROSS PATHOLOGY (OFFSPRING)
F1: No test item-related changes were observed in the organs or tissues of the F1 pups selected for necropsy.
F2: No test item-related changes were observed in the organs or tissues of the F2 pups selected for necropsy.

SEXUAL MATURATION (OFFSPRING)
F1: No delayed development was noted for the cleavage of balanopreputial gland and vaginal opening.

HISTOPATHOLOGY (OFFSPRING)
F1: No test item-related changes in the organs or tissues of the F1 pubs were observed at any of the tested dose levels.
F2: No test item-related changes in the organs or tissues of the F1 pubs were observed at any of the tested dose levels.

FUNCTIONAL TESTS (OFFSPRING)
F1: No test item-related influence on the functional development of the F1 pups was observed. The number of pups showed no auditory startle reflex, midair righting reflex and pupillary reflex as well as the number of pups failed the passive avoidance test revealed no difference between the test item-treated animals and the control group. No test item-related influence in the open field test was apparent. The statistically significant (at p ≤ 0.01) decreased number of pups failed the passive avoidance learning test observed in the intermediate and high dose group is regarded to be a spontaneous finding. Under the present test conditions a decreased number of pups tailed the passive avoidance learning test compared to the control is of no biological relevance.

MATERNAL CARE (OFFSPRING)
F1: No deficiencies in maternal care were noted for the females treated with the test substance. No inadequate lactation or cannibalism of alive and healthy pups was observed during the 3-week lactation period.

ANOGENITAL DISTANCE (OFFSPRING)
F2: No test item-related influence was noted on the anogenital distance at any of the tested dose levels. The statistically significantly (at p ≤ 0.01) decreased anogenital distance noted for male pups of the intermediate dose group is regarded to be a spontaneous finding as no dose response relationship was observed.

Effect levels (F1)

Dose descriptor:
NOAEL
Generation:
F1
Effect level:
>= 1 000 mg/kg bw/day (nominal)
Based on:
test mat.
Sex:
male/female
Basis for effect level:
other: overall effects

Results: F2 generation

Effect levels (F2)

Dose descriptor:
NOAEL
Generation:
F2
Effect level:
>= 1 000 mg/kg bw/day (nominal)
Based on:
test mat.
Sex:
male/female
Basis for effect level:
other: overall effects

Overall reproductive toxicity

Reproductive effects observed:
not specified

Any other information on results incl. tables

Table 1. Table for reproductive toxicity study.

Group /Dose level

Fertility Index in %

F0         F1

No. of males evaluated for fertility

F0                F1

No. of fertile males

F0          F1

Group 1 (control)

83

79

24

24

22

23

Group 2 (100 mg/kg bw/day)

92

79

24

24

23

24

Group 3 (300 mg/kg bw/day)

92

96*

24

24

24

23

Group 4 (1000 mg/kg bw/day)

96*

88

24

24

24

23

*: statistically significant at p ≤ 0.01 (Fisher test)

Table 2. Organ weights of F0 females.

Organ

Group

Increase ↑

Decrease ↓

Brain

Group 4 (1000 mg/kg bw/day)

↑*

Pituitary

Group 2 (100 mg/kg bw/day)

Group 4 (1000 mg/kg bw/day)

↑*

↑*

Spleen

Group 4 (1000 mg/kg bw/day)

↑*

Uterus

Group 2 (100 mg/kg bw/day)

↑*

*: statistically significant at p ≤ 0.01 (Fisher test)

Table 3. Body weight gain.

Period / Day of age

Group

Increase ↑

Decrease ↓

Pre-mating and mating

Group 2 (100 mg/kg bw/day); F0 females

Group 3 (300 mg/kg bw/day); F0 females

↑*

↑*

Gestation

Group 3 (300 mg/kg bw/day); F0 females

*

Day 7, 14, 21

Group 4 (1000 mg/kg bw/day); F1 (until weaning) males and females

*

Week 1-2

Group 3 (300 mg/kg bw/day); F1 (parental animals) females

*

Week 9-10

Group 4 (1000 mg/kg bw/day); F1 (parental animals) females

*

*: statistically significant at p ≤ 0.01 (Fisher test)

Table 4. Examination of morphological landmarks F1 (until weaning).

Parameter

Group

Accelerated ↑

Delayed ↓

Reason

Time point

Pinna detachment

Group 4 (1000 mg/kg bw/day); females and males

*

A

Day of life

Ear opening

Group 2 (100 mg/kg bw/day); females and males

Group 4 (1000 mg/kg bw/day); females and males

*

*

A, B

A

Day of life

Eye opening

Group 4 (1000 mg/kg bw/day); females and males

*

A

Day of life

Vaginal opening

Group 3 (300 mg/kg bw/day); females

Group 4 (1000 mg/kg bw/day); females

*

*

A, B

A

Day after conception

Day of life

*: statistically significant at p ≤ 0.01 (Fisher test)

A: the slight alternation in comparison to control animals is without biological relevance

B: lacking dose dependence

C: effect is due to the relative low or high value observed for the control group

D: effect observed before start of treatment

Table 5. Table for reproductive performance.

 

Group 1 (control)

Group 2

(100 mg/kg bw/day)

Group 3

(300 mg/kg bw/day)

Group 4 (1000 mg/kg bw/day)

Fertility Index in %
F0
F1


83
79


92
79


92
96*


96*
88

No. of males evaluated for fertility
F0
F1


24
24


24
24


24
24


24
24

No. of fertile males
F0
F1


22
23


23
24


24
23


24
23

Gestation length (days)
F0
F1


21.2
21.2


21.5
21.5


21.5
21.2


21.8##
21.5

Live-Born Index (%)
F0
F1


99.7
100


96.5
100


93.9*
100


93.7*
99.5

Post-implantation loss (%)
F0
F1


 8.0
7.6


15.9
6.1


14.8
7.6


18.9*
6.7

Gestation Index (%)
F0
F1

100
100

100
100

100
100

100
100

Implantation sites (%)
F0
F1


339
325


334
312


299
324


310
341

*: statistically significant at p ≤ 0.05 (Fisher test)

##: statistically significant at p ≤ 0.01 (Dunnett test or Student´s t-test)

Table 6. Maternal effects.

Parameter

Group 1

Control

Group 2

100 mg/kg bw/day

Group 3

300 mg/kg bw/day

Group 4

1000 mg/kg bw/day

Total treated

F0/F1

 

20

 

20

 

20

 

20

No. (%) dead F0/F1

0 (0)

0 (0)

0 (0)

 

0 (0)

 

Body weight gain [g]

mean (Day 1-21)

F0

F1

 

 

53.3 ± 6.4

56 ± 8.1

 

 

53.1 ± 6.4

54 ± 6.9

 

 

51.1 ± 7.9

51.5 ± 5.4

 

 

50.0 ± 11.7

53.1 ± 6.7

Gravid uterine weight [g/kg bw]

F0

F1

 

1.744 ± 0.277

1.488± 0.544

 

2.281 ± 0.649**

1.354± 0.243

 

1.759 ± 0.464

1.557± 1.592

 

2.167 ± 0.710

1.496± 0.461

No. (%) pregnant

F0

F1

 

83

79

 

92

79

 

92

96*

 

96*

88

* p ≤ 0.05 Fisher test

** p ≤ 0.01 Dunnett test or Student´s t-test

Table 7. Litter response.

Parameter

Group 1

0 mg/kg bw/day

Group 2

100 mg/kg bw/day

Group 3

300 mg/kg bw/day

Group 4

1000 mg/kg bw/day

Implantations

[total number]

F0

F1

 

 

339

325

 

 

334

312

 

 

299

324

 

 

310

341

Implantations F0

[total/number of dams ± SD]

 

17 ± 2.3

 

16.7 ± 2.0

 

15 ± 3.0

 

15.5 ± 3.2

Total number of live and dead foetuses at birth from

F0

F1

 

 

313

300

 

 

286

293

 

 

269

299

 

 

265

320

Total number of dead foetuses

F0

F1

 

1

0

 

8

0

 

12

0

 

5

1

Total number of live born pups

F0

F1

 

312

300

 

278

293

 

257

299

 

260

319

Post-implantation loss(%)

F0

F1

 

8.0

7.6

 

15.9

6.1

 

14.8

7.6

 

18.9*

6.7

Foetal sex rationat birth (mean %, m:f)

F1

F2

 

 

44.7/55.3

50/50

 

 

52.8/47.2

52/48

 

 

50.9/49.1

49/51

 

 

51.4/48.6

51/49

Foetus weight (mean at Day of Age 1) [g]

F1

F2

 

 

6.4

6.5

 

 

6.7

6.7

 

 

6.7

6.6

 

 

6.8

6.8

Number of malformed pups

F1

F2

0

0

0

0

0

0

0

1#

Number of runts

F1

F2

 

1

1

 

2

0

 

0

1

 

0

0

*: statistically significant at p≤ 0.05 (Fisher test)

#: short tail was observed for pup no. 487-5 m

Applicant's summary and conclusion

Conclusions:
The test substance had no effect on reproductive performance.