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The use of inbred bulls in breeding

, : The use of inbred bulls in breeding. Archiv fur Tierzucht 36(3-4): 245-264

Growth, semen production and breeding value for milk yield were analysed for 122 German Black Pied Dairy (GBPD) bulls with inbreeding coefficients of 6.25, 12.5 or 25%, and 114 non-inbred GBPD bulls of similar age, mostly paternal half-brothers of the inbred bulls. The inbred bulls had poorer semen production (ejaculate volume and number of pellets of frozen semen per ejaculate) than the non-inbred bulls, and a lower daily gain on test of 0.3-0.4% per 1% increase in inbreeding.

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Naumochkina, A.V., 1972: The use of inbred Black Pied bulls on inbred and outbred cows at the Omsk and Borsk farm breeding stations. Several inbred bulls were identified that produced inbred or outbred daughters in which milk yield and fat percentage were positively correlated; in the progeny of other bulls, the 2 traits were negatively correlated.

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