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University of Nebraska - Lincoln
Department of Animal Science: Dissertations, Theses, and Student Research
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Beef Cattle Management Systems For Estrus Synchronization And Heifer Development, Hazy Rae Nielson
Beef Cattle Management Systems For Estrus Synchronization And Heifer Development, Hazy Rae Nielson
Department of Animal Science: Dissertations, Theses, and Student Research
Four experiments were conducted to evaluate estrus synchronization and heifer development systems. In the first experiment delaying AI 19 h following GnRH administration in a hybrid estrus detection and time AI protocol was evaluated. Final pregnancy rate was not different among heifers detected in estrus, AI at the time GnRH administration, or delayed AI. The second study compared the effect of melengestrol acetate (MGA) -PG and 14-d controlled internal drug release (CIDR) -PG estrus synchronization protocols on estrus response and pregnancy rates of 311 d old heifers. Final pregnancy rate was similar between CIDR and MGA treatment groups. The objective …