Effects of GnRH and hCG administration during early luteal phase on estrous cycle length, expression of estrus and fertility in lactating dairy cows

Our objective was to determine the effects of a single treatment of human chorionic gonadotropin (hCG) or GnRH from d 5 to 7 of the estrous cycle on cycle length, expression of estrus and fertility in lactating dairy cows. Lactating Holstein cows (n = 354) located in Farm 1 and lactating Jersey cows...

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Veröffentlicht in:	Theriogenology 2021-10, Vol.173, p.23-31
Hauptverfasser:	Cunha, Thiago O., Martinez, Walter, Walleser, Emil, Martins, João Paulo N.
Format:	Artikel
Sprache:	eng
Schlagworte:	Accessory CL Activity monitor Animals Cattle Chorionic Gonadotropin - administration & dosage Dairy cows Estrous Cycle Estrus Estrus Synchronization Female Fertility GnRH Gonadotropin-Releasing Hormone - administration & dosage hCG Insemination, Artificial - veterinary Lactation Luteal Phase Pregnancy Progesterone
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