不同蛋白、赖氨酸水平饲粮对杜洛克猪的肥育效果、消化率和代谢的影响

Effects of Different Dietary Protein and Lysine Levels on Growing -Finishing Performance, Digestion and Metabolism of Duroc Pigs

采用2种粗蛋白水平3种赖氨酸水平的6种饲粮,探讨其对杜洛克猪肥育效果、生长期口粮消化率及N代谢的影响。结果表明:2种蛋白水平对日增重、饲料利用经及胴体瘦肉率的影响均未达显著水准(P>0.05)。从赖氨酸水平看,前期蛋白为170%时,随赖氨酸水平提高,有提高日增重和饲料利用率的趋势,而蛋白为15％时,则以中等赖氨酸水平效果最好。后期赖氨酸水平的作用不显著。从6种饲粮看,以蛋白质15-13％,赖氨酸0.95-0.82％前后期赖蛋比均为6.3的饲粮的全期增重、胴体瘦肉率和经济效益均最高。高蛋白饲粮的粗蛋白及发粗脂肪的消化率比低蛋白饲粮高(P<0.05),但N沉积效率显著低于低蛋白饲粮(P<0.01),赖氨酸的影响不显。6组饲粮N沉积量差异不显著。

The study was conducted to examine the effects of 6 dietscontaining 2 protein levels and 3 lysine levels on growing-finishing performance, digestionand N-me tabolism in growing period of Duroc pigs. The results suggestedthat the average daily gain .efficiency of feed utilization and lean percentage were not significantly affected by protein levels. When the pigs were fed by 17% protein diets with the live—weight of 27—60 kg, the growth rate and feed efficiency tended to be imprved as lysine level increased. When the pigs were fed by 15% protein diets, the growth rate reached maximum as 0.95% lysine was used. The lysine level had no siginificanteffect on the performance of the pigs with over 60 kg live—weight. For the pigs of 27—90 kg live—weight, the best rate of gain and lean percentageswas got from the diet containing 15-13% protein, 0.95-0.82% lysine with a lysine: protein ratio of 6.3. The digestibilities of ground protein and ground fat of the pigs fed with high protein diets were higher than thosefed with low protein diets (P<0.05). N—rentention was not siginificantlyaffected by protein and lysine levels, but N-rentention efficiency of the pigs was affected by protein levels (P < 0.01).