Balancing the essential amino acid levels in dairy rations has been proven as an effective nutritional tool at all stages of lactation. Recent research revealed the benefits of methionine to health status and reproductive performance. Now methionine is recognized as an essential amino acid, key to the optimum functioning of a multitude of metabolic pathways in the dairy cow, to ensure her well-being and longevity in the dairy herd. In this article, Luchini describes guidelines for amino acid balancing during lactation.

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