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Genetic parameters of lactation milk yield as affected by lactation length adjustment procedures



Genetic parameters of lactation milk yield as affected by lactation length adjustment procedures



Proceedings of the 7th World Congress on Genetics Applied to Livestock Production, Montpellier, France, August, 2002 Session 1: 1-4



Three lactation length adjustment procedures were compared using weekly milk yield records on 2039 lactations of Sahiwal cows. Most (70%) lactations were shorter than 308 days. Predictions (in terms of bias and SD of bias) were better when future milk yield was estimated using last test day yield and average daily milk yield information of the recorded duration (LTAD) as compared to when last test day information was used only (LTD).

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