不同中性洗涤纤维水平饲粮对早期断奶羔羊生长性能、血清指标、屠宰性能和组织器官发育的影响

Effects of Different Levels of Dietary Neutral Detergent Fiber on Growth Performance, Serum Parameters, Slaughter Performance and Tissue and Organ Development of Early-Weaned Hu Lambs

本试验旨在研究不同中性洗涤纤维(NDF)水平饲粮对早期断奶羔羊生长性能、血清指标、屠宰性能和组织器官发育的影响。选用100只体况良好,体重[(6.10±0.10)kg]和日龄[(18±2)日龄]接近的湖羊公羔,随机分为4个组,每组5个重复,每个重复5只羔羊。各组分别饲喂NDF水平分别为10%(10N组)、15%(15N组)、20%(20N组)和25%(25N组)的饲粮。所有羔羊在21~60日龄均饲喂相同代乳粉。预试期3 d,正试期70 d。结果表明:1)在50、60、90日龄时,20N和25N组羔羊平均体重均显著高于10N组(P<0.05),相应的在41~50日龄、51~60日龄及21~60日龄时,20N和25N组羔羊平均日增重和平均干物质采食量也显著高于10N组(P<0.05)。除51~60日龄,其余各阶段各组间羔羊饲料转化率差异不显著(P>0.05)。2)15N组羔羊血清肌酐含量显著高于20N和25N组(P<0.05),15N、20N和25N组羔羊血清β-羟丁酸含量显著高于10N组(P<0.05)。3)20N和25N组羔羊宰前活重和胴体重均显著高于10N组(P<0.05)。4)25N组羔羊头占宰前活重的比例显著低于10N组(P<0.05),而蹄重、心脏重、肝脏重和脾脏重均显著高于10N组(P<0.05)。20N组羔羊心脏重和肝脏重显著高于10N组(P<0.05)。综合得出,饲粮NDF水平为20%或30%时,能够促进羔羊生长性能、屠宰性能以及心脏、肝脏等器官重量。

This experiment was conducted to study the effects of different levels of dietary neutral detergent fiber(NDF)on growth performance,serum parameters,slaughter performance and tissue and organ development of early-weaned hu lambs.One hundred healthy Hu lambs with similar body weight[(6.10±0.10)kg]and(18±2)days of age were randomly divided into four groups with five replicates in each group and five lambs in each replicate.Lambs in four groups were fed diets containing 10%(10N group),15%(15N group),20%(20N group)and 25%(25N group)NDF,respectively.All lambs received milk replacer at 21 to 60 days of age.The pre-experimental period lasted for 3 days,and the experimental period lasted for 70 days.The results showed as follows:1)at 50,60 and 90 days of age,the average body weight of lambs in 20N and 25N groups was significantly higher than that in 10N group(P<0.05),correspondly,at 41 to 50,51 to 60 and 21 to 60 days of age,the average daily gain and average dry matter intake of lambs in 20N and 25N groups were significantly higher than those in 10N group(P<0.05).The feed to gain ratio of lambs had no significant difference among all groups at all periods except at 51 to 60 days of age(P>0.05).2)The serum creatinine content of lambs in 15N group was significantly higher than that in 20N and 25N groups(P<0.05),the serumβ-hydroxybutyrate content of lambs in 15N,20N and 25N groups was significantly higher than that in 10N group(P<0.05).3)The live weight before slaughter and carcass weight of lambs in 20N and 25N groups were significantly higher than those in 10N group(P<0.05).4)The head percentage of live weight before slaughter of lambs in 25N group was significantly lower than that in 10N group(P<0.05),but the feet weight,heart weight,liver weight and spleen weight of lambs were significantly higher than those in 10N group(P<0.05).The heart weight and liver weight of lambs in 20N group were significantly higher than those in 10N group(P<0.05).In conclusion,when dietary NDF level was 20%or 30%,it can improve the growth performance,slaughter performance and organ weight such as heart and liver of lambs.