名词
中文翻译：Unknown
同义词：
['substitute heifer', 'replacement cow', 'substitute calf']
例句：
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1. The farmerreplaced his old heifers with new ones to improve the quality of his cattle.
农民用新的代替旧的，以提高牲畜的质量。
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2. The dairy farm replaced some of their replacement heifers with older animals to save on expenses.
奶农将一些替换母牛换成了老动物，以节省开支。
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3. The rancher decided to replace some of his replacement heifers with more experienced cows to increase productivity.
牧场主决定用更有经验的奶牛替换一部分替换母牛，以提高生产力。