Genetic and environmental effects upon reproductive performance of Holstein crossbreds in the Sudan.

@article{Amin1986GeneticAE,
  title={Genetic and environmental effects upon reproductive performance of Holstein crossbreds in the Sudan.},
  author={F M El Amin and N A Simerl and Charles J. Wilcox},
  journal={Journal of dairy science},
  year={1986},
  volume={69 4},
  pages={1093-7}
}
Data from a herd near Khartoum for 1955 to 1977 were evaluated. Climate was semidesert with most rainfall (151 of 165 mm) in July through September. Mean maximum daily temperatures ranged from 30.7 (January) to 41.1 degrees C (May); mean minima were 14.6 degrees C (January) and 26.9 degrees C (June). Original base population (1907) was Butana with additions of Butana, Dairy Shorthorn, Ayrshire, Guernsey, and Holstein. Breed groups and % Holstein were 1, 0 to 25%; 2, 26 to 49%; 3, 50%; 4, 51 to… CONTINUE READING

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