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J. R. Walters and Hooper, P. N., British experience of AI and its use in the conservation of rare pig breeds., vol. XIV. Dairy cattle genetics and breeding, adaptation and conservation., pp. 480–483, 1990. (797.08 KB)
J. R. Walters and Sellwood, R., Aspects of genetic resistance to K88 E. Coli in pigs, in Proceedings of the World Congress on Genetics applied to Livestock Production., 1982, vol. 7. Symposia (1), pp. 362-367. (1.39 MB)