Parameter Estimate* Standard Error t Value Pr > t Intercept 5677 424.0 13.4 < 0.001 Days in milk 10 0.9 11.9 < 0.001 Lactation number -554 82.6 -6.7 < 0.001 Daily Milk† 82 3.5 23.9 < 0.001 BVD%‡ -12 4.4 -2.8  0.005 * Estimated effects on 305 day milk production shown in kg † Effect of each 0.45 kg increase in daily milk production at the time of DHIA test ‡ effect of each one percent increase in anti-p80 BVD Ab binding % (increased binding indicates less anti-p80 BVD Ab in cow's milk) R2 = 0.72, P < 0.0001

Table 2: General linear model for cow characteristics associated with 305 day projected milk production (kg) corrected for age, season and fat.