The effects of intramuscular or intravenous injections of gonadotropin releasing hormone at fixed-time artificial insemination on pregnancy rates of Bos indicus beef cows

Abstract

mg injection of GnRH was administered either via Vena caudalis (n=60), or via Longissimus dorsi (n=60). Cows were inseminated with the same sire and by a single AI technician. Pregnancy was determined by the transrectal ultrasonography on d 40 after AI. Cows receiving the intravenous administration of GnRH had higher (P = 0.04) pregnancy rates than the cows receiving the intramuscular injection of GnRH (65 vs 46.6%, respectively). It was concluded that the intravenous administration of GnRH at the time of AI improved the pregnancy rates of crossbred Bos indicus beef cows submitted to FTAI.

Application of Peptide for Improving Animal Health and Livestock Productivity

“…Peptida sintetis fertirelin 2,5-10 kali lebih aktif daripada peptida alamiahnya (Mergler 2016). Pemberian buserelin asetat 0,084 mg secara intravena pada saat inseminasi buatan dapat meningkatkan keberhasilan kebuntingan pada sapi silangan Bos indicus yang mengikuti program fixed time artificial insemination (FTAI) (Demeterco et al 2014).…”