Yearling bulls shorten the duration of postpartum anestrus in beef cows to the same extent as do mature bulls1
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چکیده
منابع مشابه
Yearling bulls shorten the duration of postpartum anestrus in beef cows to the same extent as do mature bulls.
The objective of this study was to determine whether yearling bulls, when pastured with cows, reduced the duration of postpartum anestrus to the same extent as did mature bulls. This experiment was conducted over a 3-yr period. Cows were stratified by parity group to achieve 37% 2-yr-old and 63% mature (> 2-yr-old) cows within each treatment group (approximately 50 cows per treatment per year)....
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Crossbred (Bos taurus) yearling beef bulls were assessed for breeding soundness and physical traits prior to multi-sire natural mating at pasture. Bulls (n = 60) were assigned to six groups of nine or 10 bulls and two bull-groups were rotated on 14-day intervals during a 63-day mating season in each breeding herd (n = 3) of 191-196 cows. The remaining bulls (n = 14) were maintained under simila...
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15 صفحه اولPhysiological mechanisms controlling anestrus and infertility in postpartum beef cattle.
Postpartum infertility is caused by four factors: general infertility, lack of uterine involution, short estrous cycles and anestrus. The general infertility component is common to any estrous cycle and reduces potential fertility by 20 to 30%. Incomplete uterine involution prevents fertilization during the first 20 d after calving but is not related to anestrus. Short estrous cycles prevent fe...
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ژورنال
عنوان ژورنال: Journal of Animal Science
سال: 1993
ISSN: 0021-8812,1525-3163
DOI: 10.2527/1993.712306x