Endocrine and behavioral observations during transition of non-breeding into breeding season in female American bison (Bison bison)

Theriogenology
Hilde Vervaecke, Franz Schwarzenberger

Abstract

This study provides endocrine data in relation to behavioral events during the transition of the non-breeding into the breeding season in American bison (Bison bison). Fecal progesterone metabolite patterns (20-oxo-P) were obtained in 13 adult female American bison and hormonal data were correlated with behavioral observations; i.e. copulation, male tending, female tail-up behavior and gestation length. Based on fecal progesterone metabolite patterns, the breeding season started between the middle of July and early August. Predictable short cycles reflected the transition from non-breeding to the breeding season; the luteal phase of these cycles was 4.10+/-0.86 days. Copulations and female tail-up behavior were reliably associated with the hormonally detected ovulation. Male tending behavior was more loosely associated with hormonally detected ovulation. The observed hormonal pattern in the study females indicated that 9 of 10 pregnant cows conceived during the second ovulatory period in the breeding season. One other cow conceived during her third ovulatory period, and one cow did not conceive until later in the breeding season by beginning of October. Gestation duration was on average 266.30+/-1.00 days. In summary, this stud...Continue Reading

References

Sep 16, 2000·Theriogenology·Y Yavas, J S Walton
Jul 11, 2003·Animal Reproduction Science·Catherine RodenVan Elsacker Linda
Jun 4, 2004·Reproduction : the Official Journal of the Society for the Study of Fertility·A MeikleP Chilibroste
Oct 7, 2004·Hormones and Behavior·M S MooringK M McPeak

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Citations

Apr 19, 2013·Reproduction, Fertility, and Development·J Manuel PalominoGregg P Adams
Jun 5, 2007·General and Comparative Endocrinology·Jolanta KiewiszBozena Szafranska
Dec 23, 2014·Reproduction in Domestic Animals = Zuchthygiene·S KrishnakumarJ C Thundathil
Apr 1, 2017·Journal of Zoo and Wildlife Medicine : Official Publication of the American Association of Zoo Veterinarians·Sulochana KrishnakumarJacob C Thundathil
Apr 21, 2018·Journal of Mammalogy·Calvin L DuncanPaul Stapp
Feb 23, 2020·Theriogenology·Gabriela F Mastromonaco, Antonio L Gonzalez-Grajales

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