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H. C. Els, van Zyl, C. M., and Swanepoel, F. J. C., The breed structure of the Santa Gertrudis in South Africa., Proceedings of the World Congress on Genetics applied to Livestock Production, vol. 17. Genetics and breeding of dairy and beef cattle, swine and horses, pp. 254–257, 1994. (165.92 KB)
H. C. Els and Venter, H. A. W., Factors influencing the weaning mass of Africander, Hereford, Bonsmara and Simmental calves in the Northern Transvaal Bushveld., vol. XIV. Dairy cattle genetics and breeding, adaptation and conservation., pp. 394–392, 1990. (823.81 KB)