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1974
P. Ivanov, Alexeiev, A., Ivanova, E., and Vankov, K., Basic principles of selection of breeding bulls' dams in the Bulgarian Red breed., Proceedings of the World Congress on Genetics applied to Livestock Production., vol. 3, pp. 623–629, 1974. (258.69 KB)
E. Ivanova and Kirov, G., Heritability of lactation persistency in Bulgarian Red cattle., Proceedings of the World Congress on Genetics applied to Livestock Production., vol. 3, pp. 617–621, 1974. (224.54 KB)