日粮RDS水平对青年奶山羊屠宰性能、组织器官及表观消化率的影响

Effects of Dietary RDS Level on Slaughter Performance,Tissue Organs and Apparent Digestibility of Young Dairy Goats

试验旨在探究日粮中添加不同水平瘤胃可降解淀粉(RDS)对萨能奶山羊组织器官、表观消化率及肠道食靡的影响。选取16只体况相近、健康的西农萨能奶山羊随机分为高瘤胃可降解淀粉组(H-RDS,n=8)和低瘤胃可降解淀粉组(L-RDS,n=8),分别饲喂H-RDS(添加粉碎玉米)和L-RDS(添加整粒玉米)全混合日粮,预饲期7 d,试验期28周,在第28周末进行屠宰。结果表明:(1)L-RDS组与H-RDS组相比胴体净肉率差异极显著(P<0.01),且L-RDS组净肉率有明显上升趋势(0.05≤P≤0.10);(2)L-RDS组奶山羊肺的重量及肺、胰腺的相对比例显著增加(P<0.05),其他组织器官重量及比例在两组间无显著差异(P>0.05),H-RDS组奶山羊脾脏沉积蛋白显著增加(P<0.05),肾沉积蛋白有明显升高趋势(0.05≤P≤0.10);(3)L-RDS组奶山羊淀粉的进食量和消化量有上升趋势(0.05≤P≤0.10),其他营养物质的表观消化率无差异(P>0.05)。由此可知,适当降低日粮中RDS水平能提高奶山羊的生长性能,降解淀粉含量能提高奶山羊组织器官重量,改善淀粉的表观消化率。

The purpose of this experiment was to investigate the effects of adding different levels of rumen degradable starch(RDS)to the diet on tissues and organs,apparent digestibility and intestinal intake of Saanen dairy goats.Sixteen healthy Xinong Saanen dairy goats with similar body conditions were randomly divided into high rumen degradable starch group(H-RDS,n=8)and low rumen degradable starch group(L-RDS,n=8).They were fed with H-RDS(crushed corn added)and L-RDS(whole corn added)full mixed diets respectively.The pre-feeding period was 7 days,the trial period was 28 weeks,and goats were slaughtered at the end of the 28th week.The results showed that:(1)The difference in carcass net meat percentage was highly significant(P<0.01)in the L-RDS group compared to the H-RDS group,and net meat percentage in L-RDS group exhibited a significant upward trend(P<0.1);(2)In L-RDS group,the weight of the lungs and the relative proportion of lungs and pancreas of dairy goats increased significantly(P<0.05),while the weight and proportion of other tissues and organs had no significant difference between the two groups(P>0.05),the spleen sediment protein was significantly increased(P<0.05)and the kidney sediment protein was significantly increased in H-RDS group(0.05≤P≤0.10);(3)The starch intake and digestibility of milk goats in L-RDS group showed an upward trend(0.05≤P≤0.10),while the apparent digestibility of other nutrients had no difference(P>0.05).It can be concluded that proper reduction of RDS level in the diet can improve the growth performance of dairy goats,and the degradation of starch content can increase the weight of tissues and organs of dairy goats and improve the apparent digestibility of starch.