Maize (Zea mays L.) plays an important role in global food security. During 9,000 years of maize domestication and breeding, however, protein content was not a major breeding target. Consequently, many beneficial gene variants associated with higher protein content were gradually lost from cultivated maize. As a result, modern maize varieties often have low seed protein content, leading to a heavy reliance on imported soybean meal for livestock feed.

Maize (Zea mays L.) plays an important role in global food security. During 9,000 years of maize domestication and breeding, however, protein content was not a major breeding target. Consequently, many beneficial gene variants associated with higher protein content were gradually lost from cultivated maize. As a result, modern maize varieties often have low seed protein content, leading to a heavy reliance on imported soybean meal for livestock feed.

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