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Abstract

The productive performance of high-yielding Holstein-Friesian cows and the non-genetic effects of year and season of calving, cow age and dry period length were studied in cattle under permanent confinement (PC) and pasture-based (PB) systems in 2 farms of Region X of Chile. The analysed data were...

Author(s)
Davis M., P.; Magofke S., J. C.; García F., X.; Gana V., E.; González V., H.
Publisher
Facultad de Ciencias Agronómicas, Universidad de Chile, Santiago, Chile
Citation
Avances en Producción Animal, 2006, 31, 1/2, pp 65-88
Abstract

The productive performance of high-yielding Holstein-Friesian cows and the non-genetic effects of year and season of calving, cow age and dry period length were studied in cattle under permanent confinement with year around calving in the Region X of Chile. The analysed data were based on 2392...

Author(s)
Davis M., P.; García F., X.; Magofke S., J. C.; Gana V., E.; González V., H.
Publisher
Facultad de Ciencias Agronómicas, Universidad de Chile, Santiago, Chile
Citation
Avances en Producción Animal, 2006, 31, 1/2, pp 89-106
Abstract

A total of 1578 lactations of 493 cows were analysed between 1990 and 2001. Lactations were grouped according to calving season (autumn and spring), month of calving within season (autumn: March, April, May; spring: July, August, September), cow age, number of calvings and lactation year....

Author(s)
Pérez P., L.; Anrique G., R.; González V., H.
Publisher
Instituto de Investigaciones Agropecuarias, Chillán, Chile
Citation
Agricultura Técnica, 2007, 67, 1, pp 39-48
Abstract

The objectives of this study were to estimate the heritability; and genotypic, phenotypic and environmental correlations for 4% fat-corrected milk (FCM), milk yield without correction (MY), milk fat (MF) and milk fat percentage (MF%). Also, the changes in these parameters during the first 3...

Author(s)
García F., X.; Magofke S., J. C.; González V., H.; Gargiullo A., A.
Publisher
Facultad de Ciencias Agronómicas, Universidad de Chile, Santiago, Chile
Citation
Avances en Producción Animal, 2001, 26, 1/2, pp 49-62
Abstract

The performance of the daughters of New Zealand Friesian (Nz) sires, British Friesian (Br) sires and Black Chilean Friesian (FN) cows were studied. The cows were in a pasture system, having a late winter calving, and maintained at a university in Chile. Two comparisons were made: 50% Nz vs. FN (C1) ...

Author(s)
García F., X.; González V., H.; Magofke S., J. C.; Cuevas F., A.
Publisher
Facultad de Ciencias Agronómicas, Universidad de Chile, Santiago, Chile
Citation
Avances en Producción Animal, 2001, 26, 1/2, pp 63-78
Abstract

In order to identify factors affecting conception rate (CR), a total of 1375 insemination services in a dairy hard at Oromo Experimental Station, University of Chile, were analysed. In the first part, the effects influencing cow fertility were determined by using a model that included the following ...

Author(s)
González V., H.; García F., X.; Magofke S., J. C.
Citation
Avances en Producción Animal, 1999, 24, 1/2, pp 75-82