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por British Society of Animal Production.
por Imperial Bureau of Animal Breeding | Imperial Bureau of Animal Breeding and Genetics | Commonwealth Bureau of Animal Breeding and Genetics.
por American Society of Animal Science | American Society of Animal Production | American Society of Animal Science. Abstracts | American Dairy Science Association. Combined annual meeting | American Society of Animal Science. ASAS section abstracts.
por British Society of Animal Science | British Society of Animal Science. Meeting. Proceedings of the British Society of Animal Science | British Society of Animal Production.