文献类型： 外文期刊

作者： Liu, Kexiong ¹ ; Xu, Xiaoling ¹ ; Song, Yuqing ¹ ; Xiao, Linli ¹ ; Wen, Junhui ¹ ; Ding, Haiquan ¹ ; Zhao, Shuxin ¹ ; Qiao, Dongliang ² ; Zhang, Bo ³ ; Niu, Aihua ³ ; Bai, Jiahua ¹ ; Liu, Yan ¹ ;

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

2.Minist Agr & Rural Affairs, Dev Ctr Sci & Technol, Beijing 100176, Peoples R China

3.Beijing Zhongyu Pig Breeding Co Ltd, Beijing 100194, Peoples R China

关键词： Altrenogest; Estrus concentration; Follicle development; Lactation; Weaning sows

期刊名称：PORCINE HEALTH MANAGEMENT （ 影响因子：3.0； 五年影响因子：3.1 ）

ISSN：

年卷期： 2024 年 10 卷 1 期

页码：

收录情况： SCI

摘要： Background Most sows will experience negative energy balance during lactation resulting in impaired follicular development. This study aimed to treat 28-day lactating sows with altrenogest (ALT) to suppress follicle enlargement during lactation, and to assess the estrus and reproductive performance post-weaning. Methods In this study, we conducted two trials. In trial 1, we monitored the follicular development of lactating sows including 10 primiparous sows and 10 multiparous sows during the whole lactation to confirm the ALT administration time. In trial 2, a total of 42 primiparous and 111 multiparous sows were allocated to three treatments: Ctrl (control group, n = 51): no treatment; TAI (timed artificial insemination group, n = 51): sows were injected with equine chorionic gonadotropin (eCG) after weaning 24 h and gonadotropin-releasing hormone (GnRH) when they expressed estrus; and AT-TAI (ALT treatment-timed artificial insemination group, n = 51): base on the process of TAI group, the sows were fed with 20 mg ALT per day before weaning 10 days. All sows were artificially inseminated twice at 12 h and 36 h after estrus. The follicle size changes and serum hormone levels were explored in this process. Results Although the follicle size of multiparous sows was larger than primiparous sows during the whole lactation (P < 0.05), similar change trends of follicle size were observed in primiparous and multiparous sows. Meanwhile, the FSH, LH and E2 levels of multiparous sows were higher than primiparous sows. The ALT treatment significantly inhibits the increase in follicle size (P < 0.05) and reduces the serum levels of FSH, LH and E2 (P > 0.05). Additionally, ALT treatment increases estrus concentration and the preovulatory follicle size (P < 0.05), meanwhile, it delays the weaning-to-estrus interval (WEI, P < 0.001). However, the estrus rate, pregnancy rate, total pigs born and born alive did not differ between treatments (P > 0.05). Conclusions There were significant differences in the size of follicles in the lactation between primiparous and multiparous sows. ALT treatment during the last ten days of lactation concentrated estrus expression leading to higher work efficiency of breeder in batch production, however, with no improvement in reproductive performance.