肌糖原含量与猪生产性能、胴体品质及肉质性状间的关系

试验比较2个不同基因型猪肌糖原含量、生长性能、胴体品质和肉质的差异,并分析肌糖原含量与生长性能、胴体品质及肉质之间的相关关系。将7头纯种汉普夏阉公猪体重为(19.48±1.1)kg和6头长撒公猪体重为(20.5±1.5)kg在相同条件下进行单圈饲养,到体重达100kg左右时屠宰,并测定肌糖原、胴体品质和肉质。结果表明:汉普夏猪比长撒猪有较高的日增重(P>0.05),较高的肌糖原含量(P<0.05);长撒猪有较高的背膘厚(P<0.01),较低的屠宰率(P<0.05)、眼肌面积和瘦肉率(P<0.01);汉普夏猪有较低的pH2(P<0.05)、剪切力(P<0.05)和b值(P<0.01),但滴水损失和失水率(P<0.05)高于长撒猪。相关分析结果表明:肌糖原含量与眼肌面积和瘦肉率呈正相关,与剪切力、滴水损失、平均日增重、b值、pH1和pH2呈负相关,而与平均日增重、屠宰率和胴体长相关性不大。这表明肌糖原含量是影响猪胴体品质和肉质的一个重要因素。

Relationships between Muscle Glycogen and Swine Growth Performance,Carcass Traits and Pork Quality

This study was designed to compare the differences in muscle glycogen, growth performance, carcass traits and pork quality, and to investigate the relationships between muscle glycogen and growth performance, carcass traits and pork quality from two different genotypes pigs. Seven Hampshire-sired barrows with BW(19.48±1.136) kg and six Landrance-Saba(LS) barrows with BW(20.5±1.500)kg were placed in individual pens, fed same diets, and slaughtered when their weight attained 100 kg. The results suggested that Hampshire-sired pigs had greater average daily gain(P > 0.05)and higher muscle glycogen content(P < 0.05) than Landrance-Saba pigs. Landrance-Saba pigs had greater back-fat thickness (P < 0.01), lower eye lean area and lean percentage(P < 0.01), and a lower dressing percentage (P < 0.01). Hampshire-sired pigs had reduced pH2 (P < 0.05),shear force (P < 0.05), b values(P < 0.01), and greater drip loss(P < 0.05) compared to Landrance-Saba pigs. Correlation analyses showed that muscle glycogen content had positive relation to eye lean area, lean percentage, had negative relation to shear force, drip loss, b values pH1 and pH2, but had weakly relation to ADG, undressing percentage, carcass length. Results from this study suggested that muscle glycogen concentration at the time of slaughter was one important factor influencing carcass characteristics, ultimate pH and other meat quality traits.