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| 肉畜等级; 法定肉畜种类与等级; 肉牛等级美国的肉牛等级，slaughter steers 又分为质量等级 (quality grade)和产量等级 (yield grade)。其他肉牛只有质量等级 | |||
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| 肉畜等级; 法定肉畜种类与等级; 肉牛等级美国的肉牛等级，slaughter steers 又分为质量等级 (quality grade)和产量等级 (yield grade)。其他肉牛只有质量等级 | |||
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