Effects of Dietary Nutrient Levels on Growth Performance,Meat Quality,Serum Biochemical Indices and Rumen Fermentation Parameters of Duolang Sheep
[Objective]The aim of this experiment was to study the effects of dietary nutrient levels on the growth performance,body measurement traits,slaughter performance,meat quality,serum biochemical indices and rumen fermentation parameters of Duolang sheep,so as to provide an important reference for the scientific feeding of sheep.[Method]Eighteen healthy,3-4 month old Duolang sheep with similar body weight were randomly divided into 3 groups with 6 replicates per group and 1 sheep per replicate.The concentrate-to-roughage ratio of the diets Ⅰ,Ⅱ and Ⅲ were 35∶65,50∶50 and 65∶35,respectively.The experiment period lasted for 74 days,including 14 days of adaption period and 60 days of formal period.Sheep were weighed,measured body size and collected blood from the jugular vein at the 60th days before morning feeding.After slaughter,rumen contents were collected,the slaughter performance and meat quality were determined.[Result]① Compared with diet Ⅰ,diet Ⅲ could significantly increase the average daily gain and chest circumference of sheep(P＜0.05).② Compared with diet Ⅰ,diet Ⅱ could significantly increase the dressing percentage of sheep(P＜0.05),and diet m could extremely significantly increase the carcass weight,dressing percentage and liver weight of sheep(P＜0.01).③ Compared with diet Ⅱ,diet Ⅰ could extremely significantly or significantly increase a*24h,pH24h and dripping loss rate of longissimus dorsi muscle in sheep(P＜0.01 or P＜0.05),and extremely significantly or significantly increase pH45min and pH24h of biceps femoris muscle in sheep(P＜0.01 or P＜0.05).Diet Ⅲ could extremely significantly or significantly increase a*24 h and b24h of longissimus dorsi muscle in sheep(P＜0.01 or P＜0.05).Compared with diet Ⅱ,dietⅠ could extremely significantly or significantly increase L*24 h and b*45 min of biceps femoris muscle in sheep(P＜0.01 or P＜0.05).④ Compared with diet Ⅱ,diet Ⅲ could significantly increase the urea nitrogen of serum in sheep(P＜0.05).⑤ Compared with diet Ⅰ,diet Ⅲ could extremely significantly or significantly increase the contents of ruminal valerate,lactic acid,isobutyrate and isovalerate of sheep(P＜0.01 or P＜0.05),significantly decrease A/P(P＜0.05),and dietsⅡ and Ⅲ could significantly increase the ammonia nitrogen level(P＜0.05).[Conclusion]In conclusion,fed total mixed ration with a concentrate-to-roughage ratio of 65:35 diet could improve the growth performance,slaughter performance and meat quality,promote liver development,change rumen fermentation type,and increase the content of total volatile fatty acid in Duolang sheep.
万方数据
维普
