Equine chorionic gonadotropin improves the efficacy of a progestin-based fixed-time artificial insemination protocol in Nelore ( Bos indicus) heifers

A total of 177 Nelore heifers were examined by ultrasonography to determine the presence or absence of a corpus luteum (CL) and received a 3 mg norgestomet ear implant plus 2 mg of estradiol benzoate i.m. On Day 8, implants were removed and 150 μg of d-cloprostenol i.m. was administered. At the time...

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Veröffentlicht in:	Animal reproduction science 2010-04, Vol.118 (2), p.182-187
Hauptverfasser:	Sá Filho, M.F., Torres-Júnior, J.R.S., Penteado, L., Gimenes, L.U., Ferreira, R.M., Ayres, H., Castro e Paula, L.A., Sales, J.N.S., Baruselli, P.S.
Format:	Artikel
Sprache:	eng
Schlagworte:	Animals artificial insemination blood chemistry Cattle Chorionic Gonadotropin - administration & dosage cloprostenol Cloprostenol - administration & dosage controlled internal drug release devices Corpus luteum Corpus Luteum - diagnostic imaging Drug Implants eCG equine chorionic gonadotropin estradiol Estradiol - administration & dosage Estradiol - analogs & derivatives Estrus Synchronization Female fixed-time artificial insemination Follicular diameter Heifers Horses Insemination, Artificial - methods Insemination, Artificial - veterinary intramuscular injection Luteolytic Agents Nellore Norgestomet Ovarian Follicle - anatomy & histology Ovarian Follicle - drug effects ovarian follicles Ovulation Pregnancy pregnancy rate Pregnenediones - administration & dosage progestational hormones Progesterone Progesterone - blood puberty Time Factors Ultrasonography zebu
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