译者的话　　后备母猪的初配日龄、体况、情期要求在业界已有广泛的共识，但第一胎母猪在哺乳期内是应该失重还是增重存在不同的看法，本研究从统计学的角度分析得出：从第一次授精到哺乳期间母猪增重越多，其受孕失败的比例就越低，且此期间增重情况会影响第二胎的繁殖性能--增加第一次配种以及哺乳期的体重可以优化第二胎的繁殖性能。详尽内容，请观《一胎母猪的增重及繁殖情况对其二胎繁殖性能的影响》。　　一胎母猪的增重及繁殖情况对其二胎繁殖性能的影响（中）　　Effect of live weight development and reproduction in first parity on reproductive performance of second parity sows - Part 2　　L.L. Hovinga,b,∗, N.M. Soedea, E.A.M. Graatc, H. Feitsmad, B. Kempa　　a 荷兰瓦赫宁根大学瓦赫宁根动物科学研究所(WIAS)适应生理学组　　a Adaptation Physiology Group, Wageningen Institute of Animal Sciences (WIAS), Wageningen University, The Netherlands　　b 荷兰Varkens KI Nederland公司　　b Varkens KI Nederland, The Netherlands　　c 荷兰瓦赫宁根大学WIAS定量兽医流行病学小组　　c Quantitative Veterinary Epidemiology Group, WIAS, Wageningen University, The Netherlands　　d 荷兰猪遗传研究所(IPG)　　d Institute for Pig Genetics (IPG), The Netherlands　　关键词 Keywords:　　窝产仔数 Litter size　　受胎率 Pregnancy rate　　繁殖性能 Reproductive performance　　母猪 Sows　　二胎母猪 Second parity　　接上文...　　3　　结果 Results　　3.1. 对母猪增重的测定　　Measures of sow development　　两个场的母猪体重增加情况差异显著(P<0.05，表2)，因此分别进行分析。A场的初配日龄比B场小46天，初配体重比B场低21.3公斤。第一次分娩后和第一次断奶后，A场的母猪体重任然较轻。但是体重差异从初配时的21.3公斤减少到断奶时的9.5公斤。A猪场和B猪场在哺乳期的绝对体重和相对体重损失情况相似（A场分别为24.9 kg和13.6%；B场为23.7 kg和12.3%）。平均而言，A场母猪从初配到第一次断奶期间体重增加比B场母猪多(A场31.6 kg，B猪场20.9 kg；P<0.05)。　　Farms differed significantly in sow live weight development (P<0.05, Table 2) and were therefore analyzed separately. Age and weight at first insemination were 46 days and 21.3 kg lower at farm A compared with farm B. After first farrowing and at first weaning sows on farm A remained lighter, but the weight difference was reduced from 21.3 kg at first insemination to 9.5 kg at first weaning. Both absolute and relative weight loss during lactation, was similar for farm A (24.9 kg and 13.6%) and farm B (23.7 kg and 12.3%).On average, sows on farm A gained more weight in the period between first insemination and first weaning compared with farm B (31.6 kg for farm A, 20.9 kg for farm B; P<0.05).　　表2：两个猪场的母猪从第一次配种到第一次断奶的增重情况的测定。　　Table 2: Measures of sow development from first insemination to first weaning on two farms.