Physiology and Endocrinology: Hormonal Regulation of the Estrous Cycle in Dairy Cattle
نویسندگان
چکیده
J. Anim. Sci. Vol. 88, E-Suppl. 2/J. Dairy Sci. Vol. 93, E-Suppl. 1/Poult. Sci. Vol. 89, E-Suppl. 1 W277 Effects of treatments with hCG or GnRH on serum progesterone (P4) and conception rates (CR) in lactating dairy cows submitted to timed artificial insemination (AI) or embryo transfer (ET). P. Justolin*1, P. Morelli1, M. Reis1, O. Sá Filho1, F. Aragon2, M. Veras2, S. Soriano3, and J. L. Vasconcelos1, 1FMVZ UNESP, Botucatu, SP, Brazil, 2Pioneiros Veterinary Clinic, Carambei, PR, Brazil, 3Colorado Dairies, Araras, SP, Brazil.
منابع مشابه
Hormonal Profile of Ovarian Follicular Fluid and Blood Plasma during Different Stages of Estrous Cycle in Holstein Cattle
The aim of this study was to evaluate the concentrations of reproductive hormones in blood plasma and in follicular fluids of different sized follicles during various stages of the estrous cycle in Holstein cattle. Jugular blood samples from 42 adult Holstein cattle were collected immediately after the slaughter. Antral fluids from small (4-5 mm), medium (6-9 mm) and large (10-20 mm) follicles ...
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J. Anim. Sci. Vol. 88, E-Suppl. 2/J. Dairy Sci. Vol. 93, E-Suppl. 1/Poult. Sci. Vol. 89, E-Suppl. 1 T264 Effects of 72-h temporary calf removal prior to fixed-time AI on pregnancy rates and subsequent calf performance in suckled beef cows. G. H. L. Marquezini*1, V. R. G. Mercadante1, S. L. Bird2, B. J. Funnell2, and G. C. Lamb1, 1University of Florida, Marianna, 2University of Minnesota, Grand ...
متن کاملP-155: Pattern of Serum Adiponectin Concentrations in Normal Estrous Cycles of Postpartum High-Producing Dairy Cows
Background: There are accumulating evidences showing the role of adiponectin, a newly discovered adipocytokine secreted from adipose tissue, in the regulation of the ovarian function in dairy cows. The objective of the present study was to evaluate the pattern of serum adiponectin concentration during a normal estrous cycle in the postpartum dairy cows. Materials and Methods: Coccygeal vein blo...
متن کاملP-194: Follicular Fluid Adiponectin Concentrations in Follicles in The Luteal Phase of The Estrous Cycle in Dairy Cows
Background: Adiponectin is an adipocytokines which is secreted from the adipose tissue of human and domestic animals. No information is available regarding the follicular fluid adiponectin concentrations in dairy cows. Therefore, the aim of the present study was to determine the follicular fluid adiponectin concentrations in different-sized follicles in the luteal phase of the estrous cycle in ...
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There have been relatively few studies of the effects of estrogen on hormonal responses to stress. We therefore studied changes in ACTH, cortisol, norepinephrine (NE), and epinephrine (Epi) after stress induced by a barking dog (audiovisual stressor) and insulin-induced hypoglycemia (metabolic stressor) in ovariectomized sheep treated with estradiol or placebo and in intact sheep in the follicu...
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