Administration of recombinant bovine somatotropin prior to fixed-time artificial insemination and the effects on fertility, embryo, and fetal size in beef heifers

Abstract Our objectives were to determine the effects of the administration of recombinant bovine somatotropin (bST) at the initiation of a fixed-time AI (TAI) protocol on concentrations of plasma IGF-1, follicle diameter, embryo/fetal size, and pregnancy rates in replacement beef heifers. Four hund...

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Veröffentlicht in:	Journal of animal science 2018-05, Vol.96 (5), p.1894-1902
Hauptverfasser:	Oosthuizen, Nicola, Fontes, Pedro L P, Henry, Darren D, Ciriaco, Francine M, Sanford, Carla D, Canal, Luara B, de Moraes, Gentil V, DiLorenzo, Nicolas, Currin, John F, Clark, Sherrie, Whittier, William D, Mercadante, Vitor R G, Lamb, G Cliff
Format:	Artikel
Sprache:	eng
Schlagworte:	Animal reproduction Animals Artificial insemination Beef Breeding Breeding seasons Cattle Cattle - embryology Cattle - physiology Drug delivery systems Female Fertility Fertility - drug effects Fetuses Gonadotropin-releasing hormone Growth Hormone - administration & dosage Growth hormones Injection Insemination, Artificial - veterinary Insulin-like growth factor I Insulin-Like Growth Factor I - analysis Morphometry Nose Ovarian Follicle - drug effects Pregnancy Pregnancy Rate Random Allocation Recombinant Proteins - blood Reproduction Reproduction (biology) Ultrasound
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