饲养密度对仔猪生长性能和血清游离氨基酸含量的影响

Effects of Stocking Density on Growth Performance and Serum Free Amino Acid Contents of Piglets

本试验旨在研究饲养密度对仔猪生长性能和血清游离氨基酸含量的影响。选用28日龄、体重(7.72±0.29) kg的长×大二元健康仔猪720头,随机分为3组,每组6个重复(栏)。3个组分别为对照组(30头/栏)、高密度组(40头/栏)和极高密度组(50头/栏),即3个组的仔猪饲养密度分别为0.91、0.68和0.55 m2/头。试验期为28 d。结果表明:与对照组相比,饲养密度增大显著降低了仔猪的平均日增重和平均日采食量(P<0.05),显著提高了料重比(P<0.05),显著增加了争斗行为的次数(P<0.05),并且腹泻率有上升趋势(0.05≤P<0.10);随着饲养密度增大,仔猪血清中丝氨酸(Ser)、精氨酸(Arg)和蛋氨酸(Met)的含量显著降低(P<0.05),血清苯丙氨酸(Phe)和络氨酸(Tyr)含量有降低趋势(0.05≤P<0.10)。由此可见,饲养密度增大降低了仔猪的生长性能,并且降低了仔猪血清中与代谢过程及免疫功能相关的部分氨基酸含量。

This experiment was conducted to study the effects of stocking density on growth performance and serum free amino acid contents of piglets.A total of 720 healthy 28-day-old Large White×Landrace piglets with the body weight of(7.72 ± 0.29) kg were randomly divided into 3 groups with 6 replicates(pens) in each group.The 3 groups were control group(30 piglets per pen),high density group(40 piglets per pen) and very high density group(50 piglets per pen),the stocking densities of the 3 groups were 0.91,0.68 and0.55 m2 per head.The experiment period was 28 days.The results showed that compared with the control group,increasing stocking density significantly reduced the average daily gain and average daily feed intake of piglets(P<0.05),significantly increased the ratio of feed to gain(P<0.05),and the diarrhea rate had an increasing trend(0.05≤P<0.10);with the stocking density increasing,the contents of serine(Ser),arginine(Arg) and methionine(Met) in serum of piglets were significantly decreased(P<0.05),and the contents of phenylalanine(Phe) and tyrosine(Tyr) in serum had a decreasing trend(0.05≤P<0.10).The results show that increasing stocking density reduces the growth performance of piglets and reduces the contents of free amino acids in serum of piglets which are associated with metabolic processes and immune function.