What are Production Diseases, and How do We Manage Them?

Table 1 Summary of multiple logistic regression analyses for ketosis of 590 third or more calvers in 6 herds, 1996^a.

	Summer calvings	Long dry period	Postparturient uterine diseases	BCS ≥ 3.75 at drying off	Milk fat to protein ratio in 1st test day^c
Rate/value	25.3	67.6 ± 9.1	38.1	31.7	1.380
Odds ratio^d	3.2**	1.3*^b	7.5**	2.7**	2.1**

*p < 0.05 **p < 0.01; ^aEffects of herds and parity were controlled; ^bFor each additional 10 days; ^cUpper quarter; ^dOdds ratio of a cow with a trait having ketosis compared to a cow without one.

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