高血球粉低蛋白质日粮补充异亮氨酸对仔猪生产性能和血液生化指标的影响

EFFECTS OF ISOLEUCINE SUPPLEMENTATION TO LOW PROTEIN DIET WITH HIGH LEVEL OF SPRAY-DRIED BLOOD CELL MEAL ON PERFORMANCE AND SERUM PARAMETERS IN PIGLETS

选择42日龄平均体重(11.00±0.07)kg 的三元(杜×长×大)杂交断奶仔猪45头 ,随机分为3个处理 ,分别饲喂 :①20 %蛋白质日粮(含血球粉4.5 % ,异亮氨酸0.64 %) ;②高血球粉(6 %)低蛋白质(16 %)日粮补充赖氨酸、蛋氨酸、苏氨酸和色氨酸(异亮氨酸含量0.41 %) ;③在第2种日粮的基础上进一步补充0.23 %异亮氨酸。试验结果 :在高血球粉低蛋白质日粮中进一步补充异亮氨酸后 ,仔猪日增重和日采食量分别提高81 %(P<0.05)和48 %(P<0.05) ,饲料/增重比降低了19 %(P<0.07)。补充异亮氨酸组与20 %蛋白质组仔猪的生产性能相似。在高血球粉低蛋白质日粮中进一步补充异亮氨酸 ,显著降低了血清尿素氮、氨和游离异亮氨酸含量(P<0.05)。结论 :合理补充合成氨基酸 ,能够节约仔猪日粮蛋白质4个百分点 ;异亮氨酸是血球粉的主要限制因子之一 ,补充异亮氨酸 。

Forty-five piglets (Duroc×Landrace×Yorkshire,11.00±0.07kg)were selected to investigate the effects of crystal isoleucine supplementation(0.23%) to a low protein(16%) and low isoleucine(0.41%) diet supplemented with lysine,methionine,threonine and tryptophan on growth performance and serum parameters.Crystal isoleucine supplementation to low protein and low isoleucine diets increased average daily gain by 81%(P<0.05)and average daily feed intake by 48%(P<0.05) and decreased the feed to gain ratio by 19%(P<0.07).Growth performance of piglets fed the diet supplemented with crystal isoleucine was similar to that of piglets fed an unsupplemented diet containing 20% crude protein and 0.64% isoleucine.Serum urea nitrogen and ammonia concentrations decreased significantly(P<0.05) with crystal isoleucine supplementation.It was concluded that supplementation with synthetic amino acids of diet could spare protein by 4% and supplementation with isoleucine improved the feeding value of spray-dried blood cell meal in piglets.