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(Co)variance component estimation of yield traits between different lactations using an animal model

, : (Co)variance component estimation of yield traits between different lactations using an animal model. Livestock Production Science 43(2): 111-117

Records for the first 4 lactations in 18 658 Holstein cows, collected between 1974 and 1991 from 135 herds in Northern Spain, were studied. Additive and residual (co)variances between lactations were estimated for milk, fat and protein yields. Milk and fat yields were measured in all lactations but protein yields in only 10 583 cows. Two analyses were carried out.

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