Resumo

MENDEZ, M.  e  FRAGA, L.M.. Milk yield and fat percentage at the control day in river buffalo cows in the Granma province. Arch. zootec. [online]. 2012, vol.61, n.233, pp.11-18. ISSN 1885-4494.  https://dx.doi.org/10.4321/S0004-05922012000100002.

The performance of milk yield (PDCL) and fat percentage (PDCG) was studied in the control day in buffalo herds of the Granma province using 2140 monthly records of daily milk yield and 1620 of fat records from 500 lactations. This corresponded to 150 buffalo cows of the Buffalypso breed whose calvings occurred between 1997 and 2005. The SAS statistical software was used with a mixed model of fixed effects for the effects group of contemporaries, weighting date and the interaction between herd and weighting date as fixed, and herd and earring of each animal within each herd, as random. The repeatability values for milk and fat were calculated. It was concluded that the milk yield in the control day was low and the fat percentage was kept within the range for this species. The repeatabilities were, in general, within the range from middle to high. The modeling with the values TDMP and TDMF fitted by the lineal model had high coefficients of adjustment using the logarithmic quadratic model. The selection of the buffalo cows for milk yield could be done from the repeated records of the control day through the highest values of repeatabilities obtained, studying also the non-genetic factors affecting milk yield.

Palavras-chave : Model; Curve; Repetibility.

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