Persistency of lactation is a functional trait of great economic importance, allowing for the use of cheaper feeds and for the reduction of health costs (Dekkers et al., 1998). However, a widely accepted measure of lactation persistency has not been achieved so far (Gengler, 1996). A possible reason can be found in the a priori connotation of the several proposed measures, that refer to a standard shape of lactation curve regardless of the effective (co)variance structure of the original variables, i.e. Test Day (TD) records taken at different time intervals from calving. Aims of this work are : i) to find a measure of lactation persistency that originates directly from the (co)variance structure of data ; ii) to check the ability of this index to discriminate lactation patterns with different persistency ; iii) to analyse on phenotypic level the effect of some environmental factors on persistency
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 1, , 1.08, 2002
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