摘要:
为探讨等消化能、等氨基酸平衡模式下,不同日粮可消化赖氨酸(DLys)水平对40~70kg后备母猪生长性能、血清指标的影响,选用120头体况相似、平均体重约为40.00kg的长大二元母猪,随机分成4组,每个组3个重复,每个重复10头猪,分别饲喂DLys水平为0.68%(试验1组)、0.73%(试验2组)、0.78%(试验3组)、0.83%(试验4组)的玉米-豆粕型日粮,试验期38d。结果表明,试验3组平均日增重(ADG)最大(787.43g),料重比(F/G)最低(2.55);试验3组血清尿素氮(BUN)含量显著低于其他试验组(P<0.05);血清IGF-Ⅰ、T3和T4含量各组间差异不显著(P>0.05);试验3组血清游离赖氨酸、苏氨酸含量显著低于或明显低于1组、2组和4组。由此可见,在本试验条件下,长大后备母猪40~70kg阶段适宜日粮DLys水平为0.78%,以消化能浓度表示为0.57g·MJ-1。
Abstract:
The study was conducted to evaluate the effects of four dietary digestible lysine levels on the growth performance and serum indices of replacement gilts from 40 to 70kilograms based on corn-soybean meal with isoenergy and the same ideal amino acid pattern.A total of one hundred and twenty two-line crossbred gilts(Landrace×Large White),with 40 kg of average body weigh and similar body conditions were allocated to four groups with three replicates per group and ten per replicate.The gilts were fed with four diets with different digestible lysine(DLys)levels of 0.68%(trial group 1),0.73%(trial group 2),0.78%(trial group 3)and 0.83%(trial group4).The results showed that average daily gain(ADG)(787.43g)were highest and F/G(2.55)were lowest in trial group 3(P<0.05),the concentration of BUN was significantly lower than that in other trial groups(P<0.05),and the concentration of IGF-Ⅰ was no significant difference among the trial groups(P >0.05).In conclusion,the optimum level of DLys in replacement gilt weighting 40 to 70kg based on this experiment were0.78%,or 0.57g·MJ-1 as expressed with digestive energy(DE).
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