文献类型： 外文期刊

作者： Bai, J. H. ¹ ; Qin, Y. S. ¹ ; Zhang, S. L. ³ ; Xu, X. L. ¹ ; Song, Y. Q. ¹ ; Xiao, L. L. ¹ ; Feng, T. ¹ ; Tian, J. H. ² ; Liu, Y. ¹ ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Inst Anim Husb & Vet Med, Beijing 100097, Peoples R China

2.China Agr Univ, Coll Anim Sci & Technol, Minist Agr, Natl Engn Lab Anim Breeding,Key Lab Anim Genet Br, Beijing 102206, Peoples R China

3.Beijing Univ Agr, Coll Anim Sci & Technol, Beijing 100096, Peoples R China

关键词： Batch farrowing; Controlled ovulation; Farrowing rate; Gonadorelin; Swine

期刊名称：ANIMAL （ 影响因子：3.73； 五年影响因子：3.908 ）

ISSN： 1751-7311

年卷期： 2021 年 15 卷 12 期

页码：

收录情况： SCI

摘要： 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. (c) 2021 The Author(s). Published by Elsevier B.V. on behalf of The Animal Consortium. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).