Frequ{ring}ncia dos registros na seleç{acute}o para produç{acute}o de leite
Five milk recording methods were compared: three methods with register of the production of two milkings with biweekly (BW), monthy (M) and bimontly (BM) frequency; and two methods (A & C) with register of only one milking , alternating the morning and afternoon milkings monthly. The dairy production records of 509 lactations of HPB, Jersey and mixed HPB-Gir cows were used. For 425 lactations of 176 cows, it was possible to correct the total production by age and blood degree, and the express it as a deviation from the contemporary companions. For effects of selection on milk production, all the methods studied resulted in a similar genetic gain, for cows as well as for bulls, enabling the choice between them to be made solely on the basis of practical considerations
| Main Authors: | , , |
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| Format: | biblioteca |
| Published: |
1979
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| Subjects: | GANADO DE LECHE, PRODUCCION DE LECHE, REGISTROS DE PRODUCCION, FRECUENCIA, SELECCION, GENETICA, BRASIL, |
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