Embryonic resorption in context to intragestational corpus luteum regression: A longitudinal ultrasonographic study in the European brown hare (Lepus europaeus PALLAS, 1778)

Schroeder, Katharina; Drews, Barbara; Roellig, Kathleen; Goeritz, Frank; Hildebrandt, T.B.

doi:10.1016/j.theriogenology.2013.05.010

Cited by 7 publications

(6 citation statements)

References 40 publications

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“…These values are 3 times higher than that of 20% generally reported in polytocous mammals (Sharkey and Smith 2003). In European brown hare (Lepus europaeus), the rate of embryo loss was reported as 42% (Schroeder et al 2013). The mechanism of embryo loss in mice is owed to endogenous apoptosis which takes place without maternal interaction (Drews et al 2020).…”

Section: Discussionmentioning

confidence: 74%

Effect of Age at Breeding on Female African Giant Rat (Cricetomys gambianus) Fertility in Captivity

2022

Int J Vet Sci

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This study aimed to evaluate the influence of age at breeding one female African giant rat (FAGR) fertility. Twenty-four nulliparous FAGR of 6, 8, or 10 months old were allocated to one of the three groups according to their age. They were housed individually and fed ad libitum. After five days of accommodation, a male was transferred into a female cage, and daily vaginal smears were performed to evidence mating for a period not exceeding 30 days. Reproductive parameters were then evaluated. Results showed a significant reduction (P<0.05) in pre-coitus cohabitation time in 8 (6.75±4.23days) and 10 (5.13±1.25days) months old females as compared to those aged six months (22.25±1.75days). There was an increase in mating rates, fertile mating, fertility, and stillbirth in 8 and 10 months old FAGR. The litter size significantly increased (P<0.05) in 8 and 10 months old compared to 6 months old FAGR. Preimplantation embryo losses rates were 60.00±39.44, 66.66±34.96, and 35.00±21.19% in 6, 8, and 10 months old FAGR, respectively. In this study, fertility increased with age, so it was better in the FAGR older than six months.

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Section: Discussionmentioning

confidence: 74%

Effect of Age at Breeding on Female African Giant Rat (Cricetomys gambianus) Fertility in Captivity

2022

Int J Vet Sci

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“…Because no empirical value was available, this value was obtained by calibration. Prenatal loss of individual embryos and entire litters, especially at the beginning of the gestation period, was reported by Schröder [26]. This was reflected in the model by a probability of abortion at a random time point during gestation.…”

Section: Submodelsmentioning

confidence: 87%

Modeling individual movement decisions of brown hare (Lepus europaeus) as a key concept for realistic spatial behavior and exposure: A population model for landscape‐level risk assessment

Kleinmann¹,

Wang²

2017

Enviro Toxic and Chemistry

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Spatial behavior is of crucial importance for the risk assessment of pesticides and for the assessment of effects of agricultural practice or multiple stressors, because it determines field use, exposition, and recovery. Recently, population models have increasingly been used to understand the mechanisms driving risk and recovery or to conduct landscape-level risk assessments. To include spatial behavior appropriately in population models for use in risk assessments, a new method, "probabilistic walk," was developed, which simulates the detailed daily movement of individuals by taking into account food resources, vegetation cover, and the presence of conspecifics. At each movement step, animals decide where to move next based on probabilities being determined from this information. The model was parameterized to simulate populations of brown hares (Lepus europaeus). A detailed validation of the model demonstrated that it can realistically reproduce various natural patterns of brown hare ecology and behavior. Simulated proportions of time animals spent in fields (PT values) were also comparable to field observations. It is shown that these important parameters for the risk assessment may, however, vary in different landscapes. The results demonstrate the value of using population models to reduce uncertainties in risk assessment and to better understand which factors determine risk in a landscape context. Environ Toxicol Chem 2017;36:2299-2307. © 2017 SETAC.

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“…[43] Placental luteotropin in rabbits has been implicated as the embryonic signal for maintaining luteal hormone production during pregnancy. [44] Luteotropin sustains luteal function by follicular production of estradiol, the major luteotropic hormone in the rabbit.…”

Section: Caesarean Section Data Of Doesmentioning

confidence: 99%

“…The production of luteal progesterone from the corpus luteum helps maintain pregnancy, stating the need for the embryo to send out signals to prolong its life during the period of pregnancy. [43] Placental luteotropin in rabbits has been implicated as the embryonic signal for maintaining luteal hormone production during pregnancy. [44] Luteotropin sustains luteal function by follicular production of estradiol, the major luteotropic hormone in the rabbit.…”

Section: Caesarean Section Data Of Doesmentioning

confidence: 99%

A comparative study on the embryo-fetal development in rabbits after artificial insemination

Obasi¹,

Lambe²,

Gbadamosi³

et al. 2016

Anatomy

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Objectives: Artificial insemination (AI) is the introduction of spermatozoa into a female's uterus or cervix for the purpose of achieving pregnancy. It is a fertility treatment for humans, in animal breeding and embryo-fetal developmental studies. This study investigated the embryo-fetal development in the rabbit via artificial insemination by evaluating the litter size, reproductive data and external morphological abnormalities after insemination. Methods:Ten adult female and three male rabbits weighing 1.8 kg and 2 kg, respectively were used. Group A served as the natural mating, while Group B served as the AI group, and the males served as semen donors. On day 28 of gestation, does were subjected to caesarean section. The ovaries and uteri were removed and examined for the number of corpora lutea and the status of all implantation. Results:Results showed a significant increase in fetal weight, total fetal number, total resorption sites, number of implantation and total number of live foetuses (p<0.05), while there was no significant increase in parameters like average fetal weight, placenta weight, uterine gravid weight, number of corpora lutea and sex ratio in Group B compared to Group A (p>0.05). A conception rate of 100% was observed in Group A compared to Group B with 80% conception rate. External examination carried out on the foetuses revealed no external abnormalities in both groups. Conclusion:The results of this study show the clear advantages in the use of rabbits for AI in terms of embryo-fetal developmental studies.

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Embryonic resorption in context to intragestational corpus luteum regression: A longitudinal ultrasonographic study in the European brown hare (Lepus europaeus PALLAS, 1778)

Cited by 7 publications

References 40 publications

Effect of Age at Breeding on Female African Giant Rat (Cricetomys gambianus) Fertility in Captivity

Effect of Age at Breeding on Female African Giant Rat (Cricetomys gambianus) Fertility in Captivity

Modeling individual movement decisions of brown hare (Lepus europaeus) as a key concept for realistic spatial behavior and exposure: A population model for landscape‐level risk assessment

A comparative study on the embryo-fetal development in rabbits after artificial insemination

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