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100 percent 12,500 pound production annual change annual increase average age average productive calculated calf losses central composite design Coefficient of determination Correlations cow loss crop dairy cows dairy herd dairy purposes dependent variables effect enter the herd error of estimate estimated breeding value estimated producing ability experimental design farm manager Final equation freshening genetic gain haylage heifer calves born higher levels higher rearing rates Holstein income increase in breeding increase in milk involuntary loss lactation level of breeding level of production levels of calf levels of rearing linear terms lower rearing rates mastitis maximum replacement rate Mean Deviation Means and standard milk price milk production milk yield number of heifers oats optimum rearing rate percent rearing rate pound production level predicted difference rate of increase rearing costs rearing rate levels reported second derivative silage simulation program standard deviations Standard error Table tion worth and rearing