Avaliação da produção de leite do rebanho da raça Holandesa da Estação Experimental de São Bento do Una - IPA

Abstract

Milk records were evaluate at daily, weekly, each 20 days and monthly intervals, to extrapolate milk production totals in the years between 1988 and 2003. Daily observations of milk production were analyzed in the morning (PLM), in the afternoon (PLT) and as daily totals (PLDIA). The data are relative to 117196 daily record evaluations of 414 lactations of 188 Holstein cows, pure of origin and of high genetic degree, from agreste region on Pernambuco state. For the statistical analyses the auto-regressive model of first order was used. Observed that autocorrelations predict for controls daily, weekly, each 20 days and monthly they are overestimated, mainly among closer days of two productions in the interval of one to 30 days in any period of the lactation. Independent of the control interval the correlations of Pearson among PLM, PLT and PLDIA were high and significant. Among the intervals of it milks studied PLT it can be indicated for the genetic evaluation and it is to criterion of the producer the definition among PLM, PLT and PLDIA to esteem the total production of milk.