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Study of correlations between genetic values production - reproduction and type in Holstein breed sires in Ecuador

Abstract:

In Chimborazo-Ecuador study of correlations between predicted ability to transmit protein (PTAP): Production-, type, and Reproduction of Holstein sires were analysed, using the database of bulls available in the US, marketed in Ecuador; 25 bulls were selected; the data were processed by descriptive statistics, and linear correlation analysis was performed by the Pearson method using SPSS Statistic version 19. In the correlation between productive and reproductive parameters, this indicated that 56% of the characteristics are not correlated, so, they are independent. That progress directly (correlated) are: daughters’ pregnancy rate (DPR) with productive life (PL) and habitability (LIV). In addition, the daughter’s conception rate (HCR) was correlated with predicted ability to transmit protein (PTAP) and cow’s conception rate (CRC) with LIV. In reference to the correlations between productive and type parameters, it was observed that 82.61% of the characteristics were independent. Dairy temperament (DF) was correlated with PTAP and predicted ability of fat transmission (PTAF). For the correlation between reproductive and type parameters, 67.82% of the characteristics are independent. PTAT was directly correlated with cup of conception of the bull (SCR) same as index udder Hosltein (JUI) with SCR. For this reason, the producers should select the studs looking for the characteristics that are correlated, because this influence the development of livestock.