Reproductive cycle of the steppe polecat (Mustela eversmanni)
| Autor: | S. Neirinckx, Rodney A. Mead, N. M. Czekala |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
Male
Litter (animal) Embryology medicine.medical_specialty Litter Size Polecat Carnivora Mustela eversmanni Endocrinology Animal science Estrus Pregnancy Internal medicine Testis medicine Animals Progesterone photoperiodism Estrous cycle Estrogens Conjugated (USP) biology Reproduction Ferrets Obstetrics and Gynecology Cell Biology biology.organism_classification medicine.disease Reproductive Medicine Gestation Female Testicular Regression Seasons |
| Zdroj: | Reproduction. 88:353-360 |
| ISSN: | 1741-7899 1470-1626 |
| DOI: | 10.1530/jrf.0.0880353 |
| Popis: | In laboratory conditions, in a natural photoperiod, testicular redevelopment began in late December. Maximal testis size was attained by the end of February. Testicular regression began in mid-May and was complete by the end of August. Oestrus was first observed in late March and continued throughout April. Females mated for the first time between 30 March and 8 April. Mating generally coincided with peak concentrations of urinary oestrone conjugates and when vaginal lavages contained greater than 90% cornified epithelial cells. Blastocyst implantation occurred by Day 13 and the post-implantation period was 29 days. Gestation ranged from 39 to 43 days and first parturition occurred in mid-May. Concentrations of urinary oestrone conjugates and free progesterone were elevated during the first half of pregnancy, reaching maximum values at mid-pregnancy, and then gradually declined as parturition neared. Litter size of primiparous females averaged 6.8 young/female. Females that were pseudopregnant or lost their litters shortly after birth, and several with weaned kits, exhibited a second oestrus. |
| Databáze: | OpenAIRE |
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