成年云岭黑山羊的屠宰性能及肉质理化特性研究

对白天放牧,晚上补饲的24月龄成年云岭黑山羊的屠宰性能及肉质理化特性进行研究。8头云岭黑山羊用于本试验,所有试验山羊14日龄去势,90日龄断奶。断奶后采用"白天放牧、晚上补饲"的半放牧饲养方式,补充饲料粗蛋白18.5%,代谢能12.5 M J/kg。饲养至24月龄屠宰,测定屠宰性能和背最长肌理化特性。屠宰性能结果显示,宰前活重、胴体重、净肉重、屠宰率和净肉率分别为37.6 kg,20.8 kg,15.8 kg,55.3%和42.0%。背最长肌的理化特性结果显示,粗水分、粗蛋白、粗脂肪、粗灰分的百分含量分别为75.53%,19.98%,3.24%,0.99%。宰后45 m in pH值6.13,在4℃条件下贮存24 h后的pH值5.55。结果显示,成年云岭黑山羊在较大月龄(24月龄)有较高的产肉量,肉质的各项理化指标均在正常范围内。

Studies on Slaughtering Characteristics and Physicochemical Properties of Longissimus dorsi of Yunling Goat

The slaughtering characteristics and physicochemical properties of Longissimus dorsi of 24-month-old Yunling goats were studied in this paper.Eight newborn lambs were used as the experimental samples.They were castrated at the age of 2 weeks and weaned at the age of 90 days.After weaned,they grazed on the pasture by day and supplied with the forage containing 18.5% crude protein and 12.5 MJ/kg metabolic energies by night until 24 months old.They were slaughtered to determine the slaughtering characteristics and physicochemical properties of Longissimus dorsi.Pre-slaughter weight,carcass weight,lean meat,dressing percentage,and lean percentage were 37.6 kg,20.8 kg,15.8 kg,55.3%,42.0%,respectively.The contents of crude moisture,crude protein,crude fat,and ash of Longissimus dorsi were 75.53%,19.98%,3.24% and 0.99%.The pH 45 min and pH 24 h values of Longissimus dorsi were 6.13 and 5.55.The results showed that the meat yield and quality of 24-month-old Yunling goat were excellent.