La prueba de progenie de toros Friesian para las características de la leche mediante el uso del método de comparación contemporáneo

The Progeny test of Friesian sires for milk traits by using the contemporary comparison method

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Omar R Mardenli
University of Aleppo, Faculty of Agriculture, Department of Animal Production, Syria


Se utilizó el método de comparación contemporáneo (CC) de la relación de medio hermanos para estimar los valores genéticos de los toros Holstein-Friesian para 305días de producción de leche (305-DMY) y componentes básicos de las características de la leche, 409 registros de vacas. que son hijas de diez toros en ocho granjas lecheras sirias donde se utilizaron. El resultado del estudio mostró diferencias en los valores genéticos estimados (ccEBVs), donde el E Sire alcanzó el valor más alto del rasgo 305-DMY (254,47 kg), mientras que el B Sire alcanzó el mayor valor de porcentaje de proteína de la leche (MPP), leche rasgos de porcentaje de grasa (MFP) y porcentaje de lactosa de la leche (MLP) (0.822%, 0.857% y 1.09% respectivamente). De acuerdo con sus toros, las hijas de E Sire superaron a sus contrapartes en los rasgos 305-DMY (p=0.001), MPP (p=0.001) y MFP (p=0.04) (5701.44 kg, 3.55% y 3.88% respectivamente). Según la fuente de la finca, las hijas de la Finca 5 alcanzaron el valor más alto del rasgo 305-DMY (p= 0.04) y las hijas de la séptima finca lograron el valor más alto del rasgo MPP (p=0.007), los valores fueron 5403.48kg y 3.54% respectivamente. Los valores de heredabilidad (h2) para los rasgos de 305-DMY, MPP, MFP y MLP fueron 0.33, 0.54, 0.43 y 0.47 respectivamente. La mayoría de los coeficientes de correlación genéticos y fenotípicos se acercaban a cero, excepto la relación genética entre MLP y MPP y la relación fenotípica entre MFP y MPP (0,88 y 0,84 respectivamente).


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