名词
中文翻译：育种困难
同义词：
['breeding barrier', 'breeding challenge']
例句：
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1.The new breed of chickens is expected to increase the efficiency of egg production.
预计新型鸡群将提高鸡蛋产量的效率。
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2.The research team has encountered breeding difficulties in developing a disease-resistant strain.
研究团队在开发一种抗病品种时遇到了育种难题。
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3. The farmer faced breeding difficulties when trying to crossbreed two different breeds of cattle.
当农民试图杂交两种不同品种的牛时，他遇到了育种难题。