Bai J H, Qin Y S, Zhang S L, Xu X L, Song Y Q, Xiao L L, Feng T, Tian J H, Liu Y
Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China.
Beijing University of Agricultural, College of Animal Science and Technology, Beijing 100096, China.
Animal. 2021 Dec;15(12):100410. doi: 10.1016/j.animal.2021.100410. Epub 2021 Nov 27.
Timed artificial insemination (TAI) is an efficient reproductive technology in batch farrowing production that aids management in pig farms. However, the effect of TAI on the reproduction performance is still controversial. This study aimed to evaluate the effects of two TAI protocols on the reproductive performance of primiparous sows. A total of 332 weaned sows were randomly allocated into three treatments. Sows assigned to Control (n = 110) were untreated and inseminated on each day in oestrus after weaning. Sows assigned to eG-TAI (n = 112) received equine chorionic gonadotropin (eCG) 24 h after weaning and gonadotropin-releasing hormone (Gonadorelin: GnRH) at oestrus, and were inseminated at 8 and 32 h later if oestrus at 0800, or 16 and 40 h later if oestrus at 1600. Sows assigned to 2e-TAI (n = 110) received eCG and GnRH 24 h and 96 h after weaning, respectively, and were inseminated 16 and 40 h after GnRH administration. Sows showing oestrus at GnRH administration or 64 h after were inseminated immediately, for a total of three inseminations. Ultrasonographic evaluations were performed to determine the follicular diameter and time of ovulation. Most sows in the 2e-TAI and eG-TAI groups ovulated 0-48 h after the GnRH injection. Our results indicated that oestrus rate within seven days after weaning in the experimental groups was higher, and weaning-to-oestrus interval was shorter than in the control group (99.3 h vs 113.5 h, P < 0.05). The breeding and farrowing rates in the experimental groups were significantly higher than in the control group (P < 0.05), while the numbers of total born, live-born and stillborn were not different among the three groups (Control: 12.7, 11.6 and 1.1; 2e-TAI: 12.4, 11.3 and 1.0; eG-TAI: 12.0, 11.4 and 0.4, respectively). These results indicated that TAI could ensure a high farrowing rate in primiparous sows under batch farrowing management.
定时人工授精（TAI）是一种在批次分娩生产中有助于猪场管理的高效繁殖技术。然而，TAI对繁殖性能的影响仍存在争议。本研究旨在评估两种TAI方案对初产母猪繁殖性能的影响。总共332头断奶母猪被随机分为三个处理组。分配到对照组（n = 110）的母猪不进行处理，在断奶后发情的每一天进行授精。分配到eG-TAI组（n = 112）的母猪在断奶后24小时接受马绒毛膜促性腺激素（eCG），发情时接受促性腺激素释放激素（戈那瑞林：GnRH），如果在08:00发情，则在8小时和32小时后授精，如果在16:00发情，则在16小时和40小时后授精。分配到2e-TAI组（n = 110）的母猪分别在断奶后24小时和96小时接受eCG和GnRH，并在GnRH给药后16小时和40小时进行授精。在GnRH给药时或给药后64小时出现发情的母猪立即进行授精，总共进行三次授精。进行超声评估以确定卵泡直径和排卵时间。2e-TAI组和eG-TAI组的大多数母猪在GnRH注射后0-48小时排卵。我们的结果表明，实验组断奶后七天内的发情率更高，断奶至发情间隔比对照组短（99.3小时对113.5小时，P < 0.05）。实验组的配种率和分娩率显著高于对照组（P < 0.05），而三组之间的总产仔数、活产仔数和死产仔数没有差异（对照组：12.7、11.6和1.1；2e-TAI组：12.4、11.3和1.0；eG-TAI组：12.0、11.4和0.4）。这些结果表明，在批次分娩管理下，TAI可以确保初产母猪的高分娩率。
