日粮能量水平对五指山猪生长性能、初情期启动及血清激素含量的影响

试验旨在研究不同日粮能量水平对五指山猪生长性能、初情期启动及血清激素含量的影响。选择20头日龄(30±2)d、体重(2.5±0.6)kg、健康的断奶五指山母猪,随机分为2个处理,分别为NRC组(标准组:饲喂基础日粮,按正常的后备母猪饲喂标准量投放饲料)和0.7 NRC组(限饲组:按NRC组70%的投饲量投喂),每个处理10个重复,每个重复1头猪,试验期10周。结果表明,断奶后6~10周时NRC组体重显著高于0.7 NRC组(P<0.05);NRC组平均日增重显著高于0.7 NRC组(P<0.05);日粮能量水平对五指山猪初情期日龄有显著影响(P<0.05),限饲(0.7 NRC)可延缓五指山母猪发情期启动;0.7 NRC组母猪初情期时背膘厚度显著低于NRC组(P<0.05),初情期时0.7 NRC组母猪背膘厚度降低39.7%左右;初情期时,NRC组血清中卵泡刺激素(FSH)、黄体生成素(LH)、雌二酮(E₂)和瘦素(Leptin)含量均显著高于0.7 NRC组(P<0.05)。由此可知,提高日粮能量水平有利于母猪初情期的启动和发情表现。

Effect of Dietary Energy Level on Growth Performance,Onset of Puberty and Serum Hormone Contents of Wuzhishan Sows

This study was conducted to investigate the effect of dietary energy level on growth performance, onset of puberty and serum hormone contents of Wuzhishan sows.Twenty Wuzhishan sows which had the similar body weight (2.5±0.6)kg and age (30±2)d were randomly allocated to 2 treatments named NRC group (Standard group:Feed the basal diet to Wuzhishan sows with the amount of the normal standard) and 0.7 NRC group (Limited energy intake group:Feed the basal diet to Wuzhishan sows with the 70% amount of the normal standard), there were 10 replicates in each group and 1 pig per replicate.The trial lasted for 10 weeks.The results showed that the body weight in NRC group was significantly higher than the 0.7 NRC group 6 to 10 weeks after weaning (P<0.05).The average daily gain weight in NRC group was significantly higher than the 0.7 NRC group (P<0.05).Dietary energy level had significant effect on the age of puberty (P<0.05), and the age of puberty in 0.7 NRC group was later than the NRC group.The thickness of back fat in the age of puberty of 0.7 NRC group was significantly lower than the NRC group (P<0.05), and decreased by 39.7%.In the age of puberty, the contents of FSH, LH, E₂ and Leptin in serum of NRC group were significantly higher than that of 0.7 NRC group (P<0.05).In conclusion, higher feeding energy level had a better body condition, which stimulated the puberty and estrous symptom in Wuzhishan sows.