Boma M H, Bilkei G
Veterinary Consulting, Bahnhofstrasse 42, CH-8600 Dübendorf, Switzerland.
Onderstepoort J Vet Res. 2006 Sep;73(3):229-32. doi: 10.4102/ojvr.v73i3.149.
Reproductive performance of 12 Kenyan pig breeding units (56-299 sows per unit) of similar feeding, genetics and health status were evaluated from October 2003 to October 2004 during hot and cooler periods. Sows during cooler months of the year (April to October, average temperature between 08:00 and 17:00: 25.2 +/- 2.2 degrees C) had shorter (P < 0.01) weaning to service intervals (7.9 +/- 2.2 days vs. 12.7 +/- 2.7 days, respectively), less (P < 0.01) regular returns to service (5.7 +/- 1.9% vs. 9.9 +/- 1.9%, respectively), higher (P < 0.01) farrowing rates (80.1 +/- 4.4% vs. 70.8 +/- 3.8%, respectively), and larger born (10.0 +/- 1.1 vs 9.1 +/- 1.7, P < 0.05) and weaned litter sizes (9.2 +/- 1.2 vs. 8.0 + 1.3, P < 0.05) compared with the time periods of high ambient temperature (November to March, between 08:00 and 17:00: 37.2 +/- 3.3 degrees C). It was concluded that a high ambient temperature is a risk factor for reproductive performance in pig breeding units.
2003年10月至2004年10月期间，在炎热和凉爽季节，对12个肯尼亚种猪场（每个猪场有56 - 299头母猪）的繁殖性能进行了评估，这些猪场的饲养、遗传和健康状况相似。在一年中较凉爽的月份（4月至10月，08:00至17:00的平均温度为25.2 +/- 2.2摄氏度），母猪断奶至配种的间隔时间更短（P < 0.01）（分别为7.9 +/- 2.2天和12.7 +/- 2.7天），返情规律的情况更少（P < 0.01）（分别为5.7 +/- 1.9%和9.9 +/- 1.9%），产仔率更高（P < 0.01）（分别为80.1 +/- 4.4%和70.8 +/- 3.8%），出生仔猪数更多（10.0 +/- 1.1头对9.1 +/- 1.7头，P < 0.05），断奶仔猪数也更多（9.2 +/- 1.2头对8.0 + 1.3头，P < 0.05），与环境温度较高的时期（11月至3月，08:00至17:00的温度为37.2 +/- 3.3摄氏度）相比。得出的结论是，环境温度高是种猪场繁殖性能的一个风险因素。
