In order to evaluate the nutritional quality of different parts of cattle carcasses of different ages, different carcass parts of Holstein veal calves and adult cattle slaughtered within 24 hours after birth and at 24 months of age, respectively, were selected for the determination of energy, protein, fat, carbohydrate, sodium, iron, zinc, ash, water and amino acids. The results showed that the energy, fat, iron and zinc contents in veal ((382.0 ± 16.6) kJ/100 g, (1.3 ± 0.4) g/100 g, (0.8 ± 0.1) mg/100 g, (25.0 ± 4.6) mg/100 g, respectively) were significantly lower than those in adult cattle beef ( (880.0 ± 463.0) kJ/100 g, (14.5 ± 14.1) g/100 g, (1.7 ± 0.7) mg/100 g, (47.0 ± 14.8) mg/100 g) (P < 0.05), but the protein and carbohydrate contents were very close to those in adult cattle beef. The essential amino acids content in veal (394.3 mg/g pro) was higher than that in adult cattle beef (365.2 mg/g pro). The nutritional composition was similar in different veal parts, while the contents of energy, fat and carbohydrate in different parts of adult cattle beef were different with coefficients of variation of 52.6%, 97.2% and 100.0%, respectively. In general, the nutrition quality of beef was different in cattle of different ages or different parts of adult cattle, and so different populations should choose the right beef according to their nutritional needs.%为针对不同月龄及不同部位牛肉开展营养品质评价分析研究,选取荷斯坦公犊牛与成年公牛(24月龄)不同部位牛肉进行能量、蛋白质、脂肪、碳水化合物、钠、铁、锌、灰分、水分及氨基酸含量的测定.结果表明:犊牛牛肉能量、脂肪、铁、锌含量(分别为(382.0±16.6)、(1.3±0.4)、(0.8±0.1)、(25.0±4.6)mg/100 g)均显著低于成年牛肉(分别为(880.0±463.0)、(14.5±14.1)、(1.7±0.7)、(47.0±14.8)mg/100 g),P值均小于0.01,而蛋白质和碳水化合物含量与成牛牛肉含量较为接近.犊牛牛肉必需氨基酸含量(394.3 mg/g pro)高于成牛(365.2 mg/g pro).犊牛不同部位牛肉营养成分较为接近,而成牛不同部位间能量、脂肪及碳水化合物含量差异较大,其变异系数分别高达52.6%、97.2%、100.0%.不同月龄及成年牛不同部位牛肉的营养品质具有一定差异,不同人群应结合自身营养需求特点进行合理选择.
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