Department of Animal and Range Sciences, New Mexico State University, Las Cruces, NM, USA.
Department of Animal and Range Sciences, New Mexico State University, Las Cruces, NM, USA.
Anim Reprod Sci. 2019 Nov;210:106191. doi: 10.1016/j.anireprosci.2019.106191. Epub 2019 Sep 10.
A 2-year experiment was conducted to determine the effect of a single injection of prostaglandin after initiation of the breeding season on ewe estrous synchronization. Rambouillet ewes (n = 101; Year 1 = 52; Year 2 = 49) assigned to one of three treatments: untreated (CON); 12-d CIDR insert (CIDR); or 1 injection of prostaglandin at d 2.5 (1 PG) after rams were placed with ewes. Rams were placed with ewes at the time of CIDR removal (d 0) and remained with ewes during a 35-d breeding season. Both the CIDR- (94%) and 1 PG (73.5%) treatment groups had a larger number (P ≤ 0.01) of ewes bred in the first 5 d of the breeding season compared to ewes of the control (33%) group. As expected, CIDR-treated ewes had a shorter time to mating, than 1 PG-treated ewes and ewes of the control group had a longer interval to mating than both CIDR- and 1 PG-treated ewes (P ≤ 0.01). The number of lambs born per ewe and kg of lamb weaned per ewe was not different (P ≥ 0.31) among treatment groups. Additionally, there was no difference (P = 0.78) in net profit per ewe among treatment groups. Based on these data, utilizing a single injection of PG 2.5 d after initiation of the breeding season resulted in similar pregnancy rates at d 5 of the breeding season when compared with CIDR-treated ewes indicating the potential utilization of the 1PG protocol in a confinement setting as a viable method for estrous synchronization.
一项为期两年的实验旨在确定在繁殖季节开始后单次注射前列腺素对母羊发情同步的影响。兰布赖特母羊（n=101；第 1 年=52；第 2 年=49）分为三组处理：未处理（CON）；12 天的CIDR 插入（CIDR）；或在公羊与母羊交配后第 2.5 天（1PG）注射一次前列腺素。公羊在 CIDR 去除（d 0）时与母羊交配，并在 35 天的繁殖季节期间与母羊一起。与对照组（33%）的母羊相比，CIDR（94%）和 1PG（73.5%）处理组的母羊在繁殖季节的前 5 天内配种的母羊数量更多（P≤0.01）。如预期的那样，CIDR 处理的母羊交配时间更短，而 1PG 处理的母羊和对照组的母羊的交配间隔时间比 CIDR 和 1PG 处理的母羊都长（P≤0.01）。每组母羊产羔数和断奶羔羊每只母羊体重无差异（P≥0.31）。此外，各组之间母羊的净收益也没有差异（P=0.78）。基于这些数据，在繁殖季节开始后 2.5 天单次注射 PG 可导致繁殖季节第 5 天的妊娠率与 CIDR 处理的母羊相似，表明在封闭环境中使用 1PG 方案作为发情同步的可行方法具有潜力。
