日粮赖氨酸水平对豫南黑猪生长性能、血清生化指标及肉质性状的影响

Effects of lysine levels on growth performance,serum biochemical parameters and meat quality in Yunan black pigs

为了解高纤维低蛋白日粮中添加不同赖氨酸水平对育肥期豫南黑猪生长性能、血清生化指标及肉质性状的影响．试验选取54头体重为60kg左右的豫南黑猪，随机分为3个处理（A组，B组，C组），每处理6个重复．每个重复3头，分别饲喂赖氨酸（Lys）水平为0．7％，0．8％和0．9％的玉米一豆粕型日粮（粗纤维含量为5．5％1．通过测定其生长性能、血清生化指标的变化、胴体性状及肉质性状，确定肥育期豫南黑猪的最佳赖氨酸水平．结果表明，育肥期豫南黑猪的平均采食量随日粮赖氨酸水平的升高而增加（P〈0．05），料重比随日粮赖氨酸水平的增加而下降（P〉0．05）．添加赖氨酸水平为0．9％时，显著提高了瘦肉率、屠宰率、肉色、总蛋白含量、粗蛋白质表观消化率、肌肉蛋白含量，显著降低了血清中尿素氮（P〈0．05）．但血清激素水平、组织器官以及肌肉矿物质含量等指标，不同赖氨酸水平间无显著差异（P〉0．05）．上述结果提示，60～90kg肥育期豫南黑猪的高纤维日粮适宜添加赖氨酸水平为0．9％．

The study was conducted to investigate the effects of different lysine levels on growth per- formance, serum biochemical parameters, carcass performance and meat quality traits in finishing Yu- nan black pigs. A total of fifty four （Yunan black） finishing pigs with 60 kg of average live weight were randomly allocated to three treatments（A, B and C group） with six replicates for each, the diets concentrate with the different levels of the lysine. The experimental diets were based on corn-soybean meal diets （ Fibrin ：5.5% ）. The results showed that the average daily feed intake（ADFI） increased sig- nificantly with the elevated Lys levels （P 〈 0.05）. With the level of lysine （0.9%） in the diets, the lean percentage, carcass percentage, muscle color, the content of total protein in serum and muscle, and apparent crude protein digestibility changed significantly （P 〈 0.05）. The different levels of the lysine in diet had no signification influence on serum hormones, tissues and organs, and the contents of mineral substance in muscles （P 〉 0.05 ）. These findings suggested that the optimal Lys in the diet （Fibrin：5.5% , in finishing Yunan black pigs with 60 -90 kg of live weight was O. 9%.