Bruun T S, Amdi C, Vinther J, Schop M, Strathe A B, Hansen C F
SEGES Pig Research Centre, Copenhagen V, Denmark.
Department of Large Animal Sciences, University of Copenhagen, Frederiksberg C, Denmark.
Theriogenology. 2016 Sep 1;86(4):981-987. doi: 10.1016/j.theriogenology.2016.03.023. Epub 2016 Mar 24.
The use of nurse sows in Danish piggeries is common practice because of large litter sizes; however, the effect of being selected as a nurse sow on subsequent reproductive performance is unknown. Therefore, the aim of this study was to quantify a nurse sow's reproductive performance in the subsequent litter. Nurse sows were defined as sows weaning their own litter at least 18 days postpartum and thereafter nursing another litter (nurse litter) before service. Data (2012-2013) from 20 piggeries with more than 14.5 live born piglets per litter and a stable distribution of sows among parities over time were selected. Records from 79,864 litters were obtained and analyzed using mixed linear and logistic regression models. The average lactation lengths were 40.3 days for nurse sows and 27.8 days for non-nurse (normal) sows. Nurse sows weaned on average 12.4 piglets and subsequently 11.5 nurse piglets, whereas non-nurse weaned 11.7 piglets in their single weaning. There was no difference in re-service rate between nurse and non-nurse sows in the subsequent reproductive cycle. Subsequent litter size in the next reproductive cycle was higher for nurse sows than that for non-nurse sows (18.69 vs. 18.11 total born piglets; P < 0.001). Nurse sows were of a slightly lower parity than non-nurse sows (3.12 vs. 3.27, P < 0.001), and nurse sows had an increased weaning to estrus interval compared to non-nurse sows (4.23 vs. 4.19 days, P < 0.001). The results indicate that nurse sows were selected among sows nursing large litters and could therefore suggest that these sows represent the best percentile of sows in a given piggery. In conclusion, this survey indicated no negative effects of being selected as a nurse sow on the subsequent reproductive performance. On the contrary, nurse sows gave birth to more piglets compared to non-nurse sows in their subsequent litter.
由于丹麦养猪场的仔猪窝产仔数较多，使用保姆母猪是常见做法；然而，被选为保姆母猪对其后续繁殖性能的影响尚不清楚。因此，本研究的目的是量化保姆母猪在下一窝中的繁殖性能。保姆母猪定义为产后至少18天断奶自己的仔猪，随后在配种前哺育另一窝仔猪（保姆窝）的母猪。选取了20个猪场（2012 - 2013年）的数据，这些猪场每窝活产仔猪超过14.5头，且不同胎次的母猪随时间分布稳定。获取了79,864窝仔猪的记录，并使用混合线性和逻辑回归模型进行分析。保姆母猪的平均哺乳期为40.3天，非保姆（正常）母猪为27.8天。保姆母猪平均断奶12.4头仔猪，随后哺育11.5头保姆仔猪，而非保姆母猪在单窝断奶时断奶11.7头仔猪。在后续繁殖周期中，保姆母猪和非保姆母猪的再配种率没有差异。保姆母猪在下一个繁殖周期的后续窝产仔数高于非保姆母猪（总产仔数分别为18.69头和18.11头；P < 0.001）。保姆母猪的胎次略低于非保姆母猪（分别为3.12和3.27，P < 0.001），与非保姆母猪相比，保姆母猪的断奶至发情间隔有所增加（分别为4.23天和4.19天，P < 0.001）。结果表明，保姆母猪是从哺育大窝仔猪的母猪中挑选出来的，因此可以表明这些母猪代表了特定养猪场中母猪的最佳百分位数。总之，这项调查表明被选为保姆母猪对后续繁殖性能没有负面影响。相反，与非保姆母猪相比，保姆母猪在后续窝中产仔更多。
