Progesterone during the breeding season and pregnancy in female muskoxen on different dietary regimens

  • Janice E. Rowell
  • Robert G. White
  • William E. Hauer
Keywords: estrous cycle, body condition, embryonic loss, abortion, progesterone, muskoxen

Abstract

Previously, we documented lowered calving success in captive muskoxen raised for 6 years on a low nutritional plane. In an effort to identify causes of lowered calf production, we looked at serum progesterone during the breeding season in muskoxen raised on either a high (HP) or low (LP) nutritional plane. Complete cessation of estrous cycli-city in 2 parous cows was the only irregularity identified. Abortion and/or embryonic loss occurred in both HP and LP cows. We also compared progesterone during pregnancy between the 2 nutritional planes and lactating and non-lacta-ting cows. The timing of the rise and fall of the mid-pregnant progesterone peak was consistent with stage of gestation and apparently independent of time of breeding, diet or lactational status.
Published
1997-02-01
How to Cite
RowellJ. E., WhiteR. G., & HauerW. E. (1997). Progesterone during the breeding season and pregnancy in female muskoxen on different dietary regimens. Rangifer, 17(3), 125-129. https://doi.org/10.7557/2.17.3.1363
Section
Brief communications