条件筛选
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Who first introduced the concept of the ideal protein model for pigs, and when?
When and by whom was the concept of the ideal protein model for pigs first introduced?
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An Analysis of the Current State and Ideal Model of China's Laying Hen Industry
The characteristics of China's laying hen industry are: 1. The small-scale, large-group industrial model still occupies an important position, while modernized models are emerging. 2. Production conditions are crude and makeshift, equipment implementation varies greatly, and overall investment is insufficient. 3. Production efficiency and production levels are uneven, and overall efficiency