Cattle on low-protein rations may need amino acid supplement to boost milk yield

When dairy cows are fed diets with reduced protein concentrations—aimed at decreased environmental nitrogen pollution from their manure such as nitrate leaching, nutrient-laden run-off and ammonia volatilization—their milk production can suffer. Supplementing the amino acid histidine may help in maintaining, and even increasing, milk and milk-protein yields.

, Hristov explained. He added that earlier studies in Europe have shown that low histidine levels can limit milk production in dairy cows fed diets based on grass silage, which is the predominant forage in Northern Europe.

A series of experiments followed, confirming the importance of histidine to maintain milk production and milk protein content when cows were fed diets with reduced protein concentration. Lactating mammals require large amounts of amino acids to support milk synthesis by mammary glands during lactation, Hristov noted. Amino acid metabolism is a critical process for the lactating mammary gland.

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