Table 1.

Linear regression models assessed the association between lameness with milk yield in grazing dairy cows (n = 6685 lactations for MILK150 and 4298 lactations for MILK305) from a commercial dairy herd evaluated for 7.5 years (January 2010–June 2017).

		MILK150 1				MILK305 2
		n	LSM 3	95% CI 4	p	n	LSM 3	95% CI 4	p
Lameness 5					<0.001				<0.001
	No	4789	5037	5006–5068		2927	9766	9703–9829
	Yes	1896	4876	4827–4924		1371	9583	9491–9675

¹ MILK150: accumulated milk yield to 150 DIM; ² MILK305: accumulated milk yield to 305 DIM; ³ LSM: least squared means were estimated with Proc Glimmix of SAS using normal distribution and identity link function; ⁴ 95% CI: 95% confidence intervals. The models were also controlled by year (2010 through 2018), season (summer (21 December to 20 March 20), fall (21 March to 20 June 20), winter (21 June to 20 September 20), and spring (21 September to 20 December 20)), and parity (1st vs. 2nd vs. ≥3rd). ⁵ Lameness: a case of lameness was defined as cows having a locomotion score of ≥4 [16].