McLoda Shelby, Anderson Nichole C, Earing Jennifer, Lugar Drew
Department of Agriculture, Illinois State University, Normal, IL 61761, USA.
School of Veterinary Medicine, Texas Tech University, 7671 Evans Drive, Amarillo, TX 79106, USA.
Animals (Basel). 2021 Sep 30;11(10):2858. doi: 10.3390/ani11102858.
The purpose of this study was to investigate the effects of light exposure on farrowing performance in sows. Thirty sows were moved to the farrowing unit at d 110 of gestation and assigned a treatment: 12 h light/12 h dark cycle (Dark) or 24 h light (Light). Treatments began upon entry into the farrowing unit. Video was recorded continuously from initiation of the treatments until completion of farrowing. Data collected included duration of farrowing, birthing interval, and behavior during farrowing. Additionally, the number of total born, liveborn, and stillborn piglets was recorded. Gestation length was different between treatments, with a shorter gestation in Dark treatment sows than Light treatment sows (116.4 vs. 117.1 ± 0.2 d, respectively; = 0.027). The total duration of parturition and number of liveborn did not differ ( = 0.393). Number of stillborn piglets between treatments did differ ( = 0.018). Dark had more stillborns compared to Light treatment sows (1.5 vs. 0.7 ± 0.2 piglets, respectively). Neither the interval between piglets nor farrowing behavior differed between treatments ( > 0.100). The results from this experiment indicate that a sudden change in photoperiod has the potential to impact the gestation length of sows and number of stillborn pigs.
本研究的目的是调查光照对母猪分娩性能的影响。30头母猪在妊娠第110天被转移到分娩单元，并被分配一种处理方式：12小时光照/12小时黑暗周期（黑暗组）或24小时光照（光照组）。处理在进入分娩单元时开始。从处理开始到分娩结束持续录制视频。收集的数据包括分娩持续时间、产仔间隔和分娩期间的行为。此外，记录出生仔猪总数、活产仔猪数和死产仔猪数。不同处理方式下的妊娠期长度不同，黑暗组处理的母猪妊娠期短于光照组处理的母猪（分别为116.4天和117.1±0.2天；P = 0.027）。分娩总持续时间和活产仔猪数没有差异（P = 0.393）。不同处理方式下的死产仔猪数存在差异（P = 0.018）。黑暗组的死产仔猪数多于光照组处理的母猪（分别为1.5头和0.7±0.2头仔猪）。仔猪之间的间隔和分娩行为在不同处理方式之间没有差异（P>0.100）。本实验结果表明，光周期的突然变化有可能影响母猪的妊娠期长度和死产仔猪数。
