Estudio de las Correlaciones entre Producción – Reproducción y Tipo de los Toros Jersey en Ecuador.

Abstract

To study the correlations between PTA (predicted transmission ability) of the Jersey bulls with genetic evaluation available in Ecuador: Production-Reproduction-Type was the proposal of this study. In the study, PTA (predicted transmission ability) of Jersey bulls was correlated with genetic evaluation available in Ecuador: Production-Type-Reproduction, by using database of Jersey bulls, available in the USA, which are commercialized in Ecuador; Twenty-five Jersey bulls were selected, the data were processed by descriptive statistics, in which the average was obtained; in turn, the correlation analysis was applied by the Pearson method using SPSS version Statistic 19. In the correlation between productive and reproductive parameters it can be indicated that 65% of the characteristics do not correlate, that is, they are independent; and those that progress directly (are correlated) are: DPR = Rate of pregnancy of the daughters with PL = Productive life and LIV= Habitability; also the HCR = Rate of conception of the daughters with PTAP = Predicted ability of transmission of protein and CCR = Rate of conception of the cow with LIV = Habitability. With respect to the correlation between productive parameters and type, it is indicated that 88% of the characteristics are independent; while for DF = milk temperament with PTAP = predicted ability of protein transmission; PTAF = predicted ability to transmit fat. For the correlation between reproductive and type parameters, 72% of the characteristics are independent; PTAT = Predicted ability of transmission of type with SCR = Rate of conception of the bull. JUI = index in Jersey with SCR = rate of conception of the bull, progress directly. For this reason, producers should consider characteristics that correlate when selecting stallions to use, to perform artificial insemination, because can have a direct or inverse impact on the herd selection and development.