饲喂模式对生长育肥猪胴体品质和脂质代谢的影响

摘要

本试验旨在研究饲喂模式对生长育肥猪生长性能、胴体品质和脂质代谢的影响.试验选择48头平均初始体重为(61.4±2.5) kg的杜×长×大三元杂交去势公猪,根据体重按随机区组设计分到自由采食组(自由采食)和限制饲喂频率组(每天饲喂2次).每个处理8个重复,每个重复3头猪.结果表明:限制饲喂频率组的平均日采食量(ADFI)、平均日增重(ADG)、胴体重、屠宰率和平均背膘厚均显著低于自由采食组(P＜0.05);饲喂模式对猪肉品质相关指标无显著影响(P＞0.10);限制饲喂频率组脂肪组织中苹果酸酶(ME)和脂肪酸合成酶(FAS)的活力显著低于自由采食组(P＜0.05);限制饲喂频率组脂肪组织中FAS和过氧化物酶体增生物激活受体γ(PPARγ)的mRNA表达量显著低于自由采食组(P＜0.05).综上分析,限制饲喂频率降低了生长育肥猪的生长性能、胴体品质和脂肪沉积,但对肉品质无显著影响,其中限制饲喂频率主要是通过降低脂肪合成减少脂质沉积.%The objective of the present study was to study the effects of feeding schedule on growth performance,carcass quality and lipid metabolism of growing-finishing pigs.A total of 48 growing-finishing pigs (initial BW 61.4 ± 2.5 kg) were assigned to one of the 2 feeding schedule (had free access to diet and restricted meal frequency) in a randomized complete block design.Pigs had free access (FA) to diet were fed on an ad libitum basis and restricted meal frequency (RMF) group were fed twice daily during the 8-weeks experimental period.There were 8 replicates per treatment group with 3 pigs per replicate.The results showed that the RMF fed pigs had lower average daily feed intake,average daily gain,carcass weight,dressing percentage and average backfat thickness than that for pigs had free access to feed (P＜0.05).There were no effects of feeding schedule on meat quality traits (P＞0.1).The activities of malic enzyme and fatty acid synthase were lower in RMF fed pigs compared with pigs had free access to diet (P＜0.05).In addition,the RMF fed pigs had lower mRNA expression levels of fatty acid synthase and peroxisome proliferator-activated receptorγ than pigs had free access to diet(P＜0.05).In summary,the RMF feeding regime decreases the growth performance,dressing percentage and lipid deposition,but has no effect on meat quality of growing-finishing pigs.The RMF feeding regime decreases lipid deposition by decreasing lipogenesis.