摘要:
采用完全随机设计,选用体重为(18.0±0.5)kg的杜长大三元杂交猪54头,随机分为3个处理,每个处理3个重复,每个重复(栏)6头猪.对照组日粮配制参照美国NRC(1998)猪饲养标准和当前福建省规模养猪常用的日粮营养水平,粗蛋白为18.59%,表观可消化赖氨酸(Lys)为0.85%.试验Ⅰ、Ⅱ组日粮在对照组日粮基础上粗蛋白浓度下调为16.96%和15.53%,相应补充合成的赖氨酸、蛋氨酸、苏氨酸,各处理日粮赖氨酸浓度相同.结果表明,Ⅰ组、Ⅱ组的日增重分别比对照组提高3.83%和2.59%(P0.05),料重比Ⅰ组比对照组增加3.54%(P0.05),Ⅱ组比对照组降低1.18%(P0.05);与对照组相比,Ⅰ组、Ⅱ组血清尿素氮浓度分别降低10.43%(P0.05)和26.78%(P0.01),血清总蛋白、血清白蛋白各处理间相近(P0.05);随日粮蛋白质浓度的降低(1.5和3.0个百分点),生长猪的生长性能、相关血液生化指标得到一定改善.
Abstract:
By supplementing low protein diets with amino acids,the effects on the growth performance and blood biochemical indicators on growing pigs were evaluated.Fifty four crossbred growing pigs(Duroc譒andrace譒arge White)with an average body weight of 18.0?0.5 kg were randomly assigned to 3 treatment groups(3 duplicates,6 pigs per duplicate)by a randomized complete block design.The feed formulation included 18.59% crude protein and 0.85% apparent digestible lysine for the control group,in accordance with NRC(1998)standards.These levels also represent the current feed nutrition at large-scale pig-breeding farms in Fujian.The protein content was reduced to16.96% for Treatment I and 15.53% for Treatment II.The dietary lysine was kept constant for all treatments by supplementing each group with synthetic lysine,and with synthetic methionine and threonine according to the ideal model.As compared to the control group,the average daily weight gain increased 3.83% for Treatment I,and 2.59% for Treatment II(P0.05);FCR improved by 3.54%(P0.05)in Treatment I,while decreased by 1.18% in Treatment II(P0.05);and,the serum urea nitrogen decreased by 10.43% in Treatment I(P0.05)and 26.78% in Treatment II(P0.01).No significant difference among treatments was found on total protein and albumin in serum(P0.05).Growth performance and relative blood biochemistry of the pigs were improved with decreasing(i.e.,1.5% and 3%)dietary protein intake.
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