Impact of birth weight and daily weight gain during suckling on the weight gain of weaning piglets

ABSTRACT This study evaluated the effect of birth weight and weight gain during the suckling phase on the piglet daily weight gain during the nursery phase (21-61 days of age). Piglets (n= 534) derived from 55 first-parity sows were weighed at birth, weaning, and end of the nursery phase. The data were analyzed according to a completely randomized experimental design, with three classes of birth weight (BW) and two classes of weight gain during the suckling phase (SDWG). High BW and low SDWG piglets were 0.2kg lighter at weaning than low BW and high SDWG animals (P< 0.05). However, at the end of the nursery phase, this situation was inverted, with high BW and low SDWG piglets 2.20kg heavier (P< 0.05). Low BW and high SDWG piglets were heavier at weaning and at the end of the nursery phase than low BW and low SDWG piglets (P< 0.05). At the same time, intermediate and high BW and low and high SDWG piglets presented body weight differences at weaning (P< 0.05), but not at the end of the nursery phase (P< 0.05). Piglets with 1.25 to 2.30kg BW and low weight gain during suckling presented a partial compensatory growth during the nursery phase.

摘要
本研究评估了初生体重（birth weight, BW）与哺乳期增重（suckling phase weight gain, SDWG）对保育期（21~61日龄）仔猪日增重的影响。试验共纳入55头初产母猪所产的534头仔猪，分别于初生、断奶及保育期结束时进行体重称量。本研究采用完全随机试验设计开展数据分析，设置3个初生体重等级与2个哺乳期增重等级。结果显示，初生体重较高且哺乳期增重较低的仔猪，断奶时体重较初生体重较低且哺乳期增重较高的仔猪轻0.2kg（P<0.05）。但在保育期结束时，该情况发生反转：初生体重较高且哺乳期增重较低的仔猪体重较前述组高2.20kg（P<0.05）。初生体重较低且哺乳期增重较高的仔猪，在断奶及保育期结束时的体重均显著高于初生体重较低且哺乳期增重较低的仔猪（P<0.05）。与此同时，初生体重中等与较高的仔猪，无论哺乳期增重高低，断奶时体重均存在显著差异（P<0.05），但保育期结束时未观测到该差异（P<0.05）。初生体重处于1.25~2.30kg且哺乳期增重较低的仔猪，在保育期表现出部分补偿性生长。