Characterisation of the Repeat Breeding Syndrome in Swedish Dairy Cattle

Table 3 Final logistic regression model for herd frequency of repeat breeder cows.

Variable	β	SE(β)	Prob.
Intercept	-0.468	0.347	n.a.^a
Herd size	-0.023	0.008	n.a.
Herd average log₁₀SCC^b	-0.155	0.276	n.a.
Herd average days from calving to 1^st AI	-0.019	0.002	>0.001
Herd incidence clinical mastitis	0.594	0.209	0.004
Herd incidence reproductive disorders	-0.501	0.239	0.036
Herd incidence other vet. treated disorders	1.313	0.655	0.045
Interaction herd size*log₁₀SCC	0.016	0.008	0.038

^a not applicable
^b Somatic cell count (SCC) was the average of log₁₀ cell counts recorded, and adjusted for effects of breed, parity and milk yield, at official test-month in the period 1–150 days in milk

ISSN: 1751-0147