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Relationships among whole- and part-lactation gross feed efficiency, feed consumption and milk yield


, : Relationships among whole- and part-lactation gross feed efficiency, feed consumption and milk yield. Journal of Dairy Science 55: 1113-1122

Milk production, food consumption and food conversion data were collected on 425 first lactation cows by 31 sires to determine if a part-lactation measure of food conversion would effectively predict total lactation efficiency. The data were summarised by ten 30-day periods (1 to 30, 31 to 60., 271 to 300) and a 300-day lactation total basis. The 2nd, 5th and 7th periods were examined to estimate h2s and genetic correlations.

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