摘要
本试验旨在研究低蛋白质饲粮补充缬氨酸(Val)对肉鸡生长性能、屠宰性能和血清指标的影响。选取300只1日龄爱拔益加肉鸡,随机分成5个组(Ⅰ~Ⅴ组),每组6个重复,每个重复10只鸡。试验各组饲粮赖氨酸(Lys)和粗蛋白质水平前期(1~21日龄)分别为1.17%和19.55%,后期(22~42日龄)分别为1.01%和17.67%;Ⅰ~Ⅴ组饲粮前期和后期Val/Lys值分别为68%、73%、78%、83%和88%。试验期42 d。结果表明:1)低蛋白质饲粮补充Val能显著提高1~42日龄肉鸡末体重和平均日增重(ADG)(P <0. 05),显著降低料重比(F/G)(P <0. 05),以ADG和F/G为效应指标进行二次曲线方程拟合表明,饲粮Val/Lys推荐值分别为80. 07%和81.03%。2)低蛋白质饲粮补充Val对肉鸡屠宰率、全净膛率、胸肌率、腿肌率和腹脂率均无显著影响(P>0.05)。3)与Ⅰ组相比,Ⅱ~Ⅴ组肉鸡血清中总蛋白、白蛋白、球蛋白含量以及总超氧化物歧化酶和过氧化氢酶活性均无显著差异(P> 0.05),但血清尿酸含量有所降低(0.05
0.05)。与Ⅰ组和Ⅱ组相比,Ⅲ组和Ⅳ组肉鸡血清中丙二醛含量显著降低(P<0.05)。低蛋白质饲粮补充Val对肉鸡血清游离氨基酸含量均无显著影响(P>0.05)。由此可见,低蛋白质饲粮补充Val能提高肉鸡生长性能和抗氧化能力。在本试验条件下,肉鸡获得最大ADG和最小F/G的饲粮Val/Lys推荐值分别为80.07%和81.03%。
The objective of this study was to investigate the effects of valine( Val) supplementation in low-protein diets on growth performance,slaughter performance and serum indices of broilers. A total of 300 one-day-old Arbor Acres broilers were randomly divided into 5 groups( groups Ⅰ to Ⅴ) with 6 replicates per group and 10 chickens per replicate. The recommended levels of crude protein in diets for broilers in the starter( 1 to 21 days of age) and grower( 22 to 42 days of age) phases were 19. 55% and 17. 67%,respectively. The dietary lysine( Lys) levels were 1.17% and 1.01% for the starter and grower phases,respectively. Dietary Val/Lys ratios were supplied with 68%,73%,78%,83% and 88% for the starter and grower phases,respectively. The experiment lasted for 42 days. The results showed as follows: 1) the Val supplementation in low-protein diets significantly increased the final body weight and average daily gain( P < 0.05),but significantly decreased the feed/gain ratio( F/G)( P<0.05) of broilers from 1 to 42 days of age. When analyzed by quadratic regression model,the optimal Val/Lys ratios for ADG and F/G were 80. 07% and 81. 03%,respectively. 2) The Val supplementation in low-protein diets had no significantly different effects on slaughter rate,whole net carcass rate,breast muscle rate,leg muscle rate and abdominal fat rate of broilers( P>0.05). 3) Compared with group Ⅰ,the serum contents of total protein,albumin,globulin and the serum activates of total superoxide dismutase and catalase of broilers in groups Ⅱ to Ⅴ were not significantly different( P > 0. 05),but the serum uric acid content was decreased( 0.05
0. 05).The serum malondialdehyde content of broilers in groups Ⅲ and Ⅳ was significantly lower than that in groups Ⅰand Ⅱ( P> 0. 05). The Val supplementation in low-protein diets had no significantly different effects on serum free amino acid contents of broilers( P>0.05). These results indicate that the Val supplementation in low-protein diets can improve the growth performance and antioxidant capacity of broilers. The recommended Val/Lys ratios to achieve maximum ADG and minimum F/G are 80.07% and 81.03%,respectively.
引文
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