Journal ArticleDOI
Short estrous cycles and associated serum progesterone levels in beef cows.
Kenneth G Odde,Kenneth G Odde,H.S. Ward,H.S. Ward,G.H. Kiracofe,G.H. Kiracofe,R.M. McKee,R.M. McKee,R.J. Kittok,R.J. Kittok +9 more
TLDR
Short estrous cycles in beef cows were investigated in two experiments and an increased percentage of cows which had calves weaned were observed in estrus within 10 and 25 days after the date of weaning and a higher percentage had 7- to 10-day estrus cycles.About:
This article is published in Theriogenology.The article was published on 1980-08-01. It has received 132 citations till now. The article focuses on the topics: Estrous cycle.read more
Citations
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Journal ArticleDOI
Postpartum acyclicity in suckled beef cows: a review.
Y. Yavas,J.S. Walton +1 more
TL;DR: A model for the postpartum ovulatory acyclicity and for the resumption of cyclicity is presented and shows an increasing frequency of GnRH discharges and LH pulses, terminal follicular maturation, ovulation, and continued cyclicity.
Journal ArticleDOI
Pattern of follicular growth and resumption of ovarian activity in post-partum beef suckler cows.
TL;DR: It is concluded that prolonged anoestrus in post-partum beef suckler cows is due to lack of ovulation of a dominant follicle rather than delayed development of dominant follicles.
Journal ArticleDOI
Influence of body condition at calving and postpartum nutrition on endocrine function and reproductive performance of primiparous beef cows
TL;DR: Concentrations of IGF-I and leptin in plasma were constant during 7 wk before the first estrus, indicating that acute changes in these hormones are not associated with the resumption of ovarian function in primiparous beef cows.
Journal ArticleDOI
Luteal function: the estrous cycle and early pregnancy.
TL;DR: The mechanisms involved in maternal recognition of pregnancy are very diverse between species and may involve direct luteotropic stimulation of the CL, reduced uterine secretion of P GF2 alpha, and/or inhibition of actions of PGF2 alpha at the level of theCL.
Journal ArticleDOI
Exogenous progesterone and progestins as used in estrous synchrony regimens do not mimic the corpus luteum in regulation of luteinizing hormone and 17 beta-estradiol in circulation of cows.
N. Kojima,T. T. Stumpf,Andrea S. Cupp,L. A. Werth,Mark S. Roberson,M. W. Wolfe,Roger J. Kittok,J. E. Kinder +7 more
TL;DR: The working hypothesis was that the low concentrations of progesterone (P4) and synthetic progestins administered in hormonal regimens to control estrous cycles of cows would have similar effects on secretion of LH and 17 beta-estradiol (E2), and concentrations of exogenous P4 typical of the midluteal phase of the estrous cycle and the corpus luteum (CL).
References
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Book
Physiology of Reproduction and Artificial Insemination of Cattle
TL;DR: Physiology of reproduction and artificial insemination of cattle, Physiology of reproduced cattle, and the role of fertilisation in the development of foetal development are studied.
Journal ArticleDOI
Alteration of the Bovine Estrous Cycle with Oxytocin
TL;DR: Oxytocin was less effective in causing diestrual shortening when either atropine or reserpine was administered concurrently, and was completely ineffective in inducing precocious estrus in hysterectomized, but not in sham-operated, heifers.