不同屠宰体重美系杜洛克母猪胴体肉质性能初报

A Preliminary Report on Carcass and Meat Quality Performances of Female American Duroc at Different Live Weights

于2001年从美国引进杜洛克原种第二代种猪群中随机抽取28日龄48头杜洛克母猪,并保育至70日龄,体重达33kg,在生长到肥育阶段饲喂含DE13.39MJ/kg,CP18%～16%的饲粮。分别在100kg、120kg、150kg体重级别从48头母猪中随机选择12头(4×3,每个体重级别4头)进行屠宰,检测体重和日龄对胴体和肉质的影响。结果表明,当体重从100kg增至150kg时,瘦肉率从66.8%显著降至62.4%,即使在150kg体重,瘦肉率也完全符合市场需求。然而,板油和花油的增加值得注意。此外,肌内脂肪,体重120kg、150kg(3.32%、3.69%)高于100kg(2.86%)。这个结果提示,随着体重增大肌内脂肪提高而改善肉质,但嫩度降低。

female Duroc were randomly selected at 28 days of age from the second generation of American Duroc Breeding herd which was imported in 2001 from U.S. The 48 females were fed in nursery house till they were 70 days of age at about 33 kg body weight. For the growing-finishing phases the pigs were fed ad libitum with diets at DE 13.39 MJ/kg and CP 18%～16%. Randomly 12 ( 4×3, 4 individuals for each body weight phase) individuals from the 48 females were selected and slaughtered at about 100 kg?120 kg and 150 kg live weight at different growing phases separately to examine the influence of body weight or age on the carcass and meat quality. The results indicated that the lean percentage decreased significantly from 66.8% to 62.4% when live weight in creased from 100 kg to 150 kg. It means that Duroc females are lean enough to current market demands even they are finished at as later as 150 kg live weight. However the increased leaf fat and viscera fat need to be monitored. In addition, higher intramuscular fat percentage were for 120/150 kg live weight (3.32%/3.69%) than that for 100 kg(2.86%). The results imply better meat quality for higher live weight with higher intramuscular fat at the expense of a little worse tenderness.