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1963
The use of return interval pattern to indicate dairy herd infertility problems, OM Castle , Proceedings of the New Zealand Society of Animal Production, Volume 23, p.88-99, (1963) , (Full PDF)
1952
Selection Through the Herd Sire, OM Castle , Proceedings of the New Zealand Society of Animal Production, Volume 12, p.40-48, (1952) , (Full PDF)