Persistence of milk production of Alpine goats in Cuba
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Abstract
the persistence of lactation and estimate its correlation with total milk production. A generalized mixed model was applied by the SAS MIXED procedure version 9.3 (2013), where fixed effects like herd, parturition year, parturition season (January-May and June-December) and lactation number were included, as well as the animal nested within each herd as random effect. In addition, the duration of lactation was included as a covariate. To estimate Pearson correlations, the CORR procedure of SAS was applied. Persistence was 53.6 % and the studied non-genetic factors were significant. The phenotypic correlations of persistence with total
milk were 0.26. It can be concluded that persistence of lactation had a low phenotypic correlation, in relation to milk production and duration of lactation. Further researches should be conducted with larger samples and genealogical information to recommend its inclusion in genetic improvement programs.
Key words: milk weighing, Alpine, lactation, correlation.
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