Vargas Anamaria J, Bernardi Mari L, Paranhos Tiago F, Gonçalves Marcio A D, Bortolozzo Fernando P, Wentz Ivo
Setor de Suínos, Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9090, CEP 91540-000, Porto Alegre, RS, Brazil.
Anim Reprod Sci. 2009 Jul;113(1-4):305-10. doi: 10.1016/j.anireprosci.2008.06.006. Epub 2008 Jun 20.
The objective of this study was to analyze reproductive performance in swine females re-serviced after return to estrus or abortion in comparison with females in first service (gilts or weaned females). Records used were obtained from four commercial sow herds in Brazil including 24,194 mating records from PigCHAMP research database. Three mating categories (first service in gilts or weaned sows, re-serviced after return to estrus and re-serviced after abortion) were considered for the analysis. The farrowing rate (FR) was less and return to estrus (RER), abortion rate (ABR) and total born (TB) were greater in the category re-serviced after return to estrus compared to first service category (P<0.05). The category re-serviced after abortion only differed from the first service category by a greater ABR (P<0.05). In gilts and PO2-5 females re-serviced after a return to estrus, the FR was less (72.0% and 83.2%) and RER was greater (22.3% and 12.5%) compared to first service PO2-5 sows (92.7% and 5.3%; P<0.05). A re-service after a return to estrus did not affect TB in PO > or =2 females (P>0.05) but resulted in less TB in gilts and greater TB in primiparous sows (P<0.05). In females re-serviced after a return to estrus the performance was similar (P>0.05) between the two intervals considered as regular return to estrus (18-24 days and 36-48 days). Among the intervals considered as irregular return to estrus, greater FR was observed in intermediate (25-35 days) than in early (11-17 days) or late (>48 days) intervals. The re-service after a return to estrus results in an impaired farrowing rate, with a greater impact on gilts than at older parities. Females re-serviced after abortion are more predisposed to the recurrence of this reproductive failure.
本研究的目的是分析经产母猪在返情或流产后再次配种时的繁殖性能，并与初配母猪（后备母猪或断奶母猪）进行比较。所使用的记录来自巴西的四个商业母猪群，包括从PigCHAMP研究数据库中获取的24,194条配种记录。分析时考虑了三个配种类别（后备母猪或断奶母猪的初配、返情后再次配种和流产后再次配种）。与初配类别相比，返情后再次配种类别的产仔率（FR）较低，返情率（RER）、流产率（ABR）和总产仔数（TB）较高（P<0.05）。流产后再次配种类别与初配类别相比，仅ABR较高（P<0.05）。在返情后再次配种的后备母猪和PO2-5经产母猪中，与初配的PO2-5经产母猪相比，FR较低（分别为72.0%和83.2%），RER较高（分别为22.3%和12.5%）（92.7%和5.3%；P<0.05）。返情后再次配种对PO≥2经产母猪的TB没有影响（P>0.05），但导致后备母猪的TB减少，初产母猪的TB增加（P<0.05）。在返情后再次配种的母猪中，被视为正常返情的两个间隔（18-24天和36-48天）之间的性能相似（P>0.05）。在被视为异常返情的间隔中，中期（25-35天）的FR高于早期（11-17天）或晚期（>48天）间隔。返情后再次配种会导致产仔率受损，对后备母猪的影响比对老龄母猪更大。流产后再次配种的母猪更容易再次出现这种繁殖失败情况。
