不同铜源和水平对肥育绵羊胴体性状、肉品质和脂肪酸组成的影响

为改善和提高绵羊肉的品质,研究不同铜源和水平对肥育绵羊胴体性状、肉品质和脂肪酸组成的影响,本试验选用50只体重相近((23.8±1.6)kg)、3月龄左右的杜泊×蒙古羊杂交一代羯羊,随机分为5组,分别饲喂5种日粮:1)基础日粮(不加铜);2)基础日粮+10 mg/kg(DM)赖氨酸铜;3)基础日粮+20 mg/kg(DM)赖氨酸铜;4)基础日粮+10 mg/kg(DM)碱式氯化铜;5)基础日粮+20 mg/kg(DM)碱式氯化铜.结果表明,日粮中添加铜显著降低了肥育绵羊背膘厚和肾脂率(P<0.01),但对热胴体重、屠宰率和眼肌面积影响差异不显著(P>0.05);日粮中添加铜对肥育绵羊肉品质没有影响(P>0.05),对血浆、肌肉和脂肪组织中脂肪酸组成也无影响(P>0.05).赖氨酸铜和碱式氯化铜2种铜源以及10和20 mg/kg(DM)2种铜水平对肥育绵羊胴体性状、肉品质和脂肪酸组成的影响是相同的,因此,本研究建议绵羊日粮的适宜铜源为碱式氯化铜,适宜铜水平为16.74 mg/kg(DM).

Effects of different dietary copper sources and levelson carcass characteristics,meat quality andfatty acid composition in sheep

The effects of different dietary copper (Cu) sources and levels on carcass characteristics,meat quality and fatty acid composition of sheep were studied to determine the optimum copper source and level in diet in order to improve the meat quality of sheep.Fifty Dorper x Mongolia wether lambs (approximately 3 months of age;average BW=(23.8±1.6)kg) were randomly assigned to one of five treatments. Treatments consisted of 1) control (no supplemental Cu), 2) 10 mg/kg (DM) from Cu-lysine, 3) 20 mg/kg (DM) from Cu-lysine, 4) 10 mg/kg (DM) from tribasic copper chloride (TBCC), 5) 20 mg/kg (DM) from TBCC.Cu supplementation,regardless of sources and levels,significantly reduced (P<0.01) backfat and kidney fat in lambs,however there is no difference observed in hot carcass weight,dressing percentage,longissimus muscle area,meat quality,fatty acid composition of plasma,longissimus muscle and backfat (P>0.05).The TBCC copper supplement at 16.74 mg/kg (DM) was recommended in sheep diet,because there is no difference observed between supplemental Cu-lysine and TBCC at level of 10 and 20 mg/kg(DM) in carcass characteristics,meat quality and fatty acid composition.