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How fast sires are improving, by breed



How fast sires are improving, by breed



Dairy Herd Improvement Letter 56(3): 3-4



Data for av. Predicted Differences (PD) for milk yields and fat yields for 1973 and 1978, and annual changes in PDs for these 2 traits in 1974-78, are tabulated by breed for Ayrshires, American Brown Swiss, Guernseys, Holstein-Friesians, Jerseys and Milking Shorthorns.

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