Table I.10.

Association between milk yield and mastitis; + = positive association: significantly more mastitis in herds with more milk yield (p < 0.05), − = negative association: significantly more mastitis in herds with lower milk yield (p < 0.05), ns = not significant

Country	System	n 1	ø Milk yield	Variable	Analysis 2	Association	Reference
FI	Tie‐stall, cubicles	4,173	Median, 2nd parity: 8,900 kg/cow & year	BACT: C. bovis IMI incidence	MA	ns	Taponen et al. (2017)
				BACT: CNS IMI incidence	MA	+
				BACT: E. coli IMI incidence	MA	+
				BACT: S. aur. IMI incidence	MA	+
				BACT: Strep. dysgal. IMI incidence	MA	+
				BACT: Strep. uberis IMI incidence	MA	+
AT	Tie‐stall, loose housing	1,221	Median: 5,617 kg/cow & year	CM: CM per cow & year	MA	+	Schenkenfelder and Winckler (2021)
CAN	Cubicle, straw yard, tie‐stall	59	26.8; 31.2 kg/cow & days 3	CM: CM/100 cow years at risk	MA	ns	Levison et al. (2016)
CAN	Tie‐stall, loose housing	11,636	701,000 kg/herd	SCC: gBMSCC	UA	ns	Bauman et al. (2018)
FI	tie‐stall, Cubicles	7,640	Only give in categories	SCC: SCC	MA	+	Hiitio et al. (2017)
CH	Loose housing	47	21.0 kg/days	SCC: SCS (1 year)	MA	−	Ivemeyer et al. (2011)

¹Number of farms.

²Statistical analysis: MA = multivariable analysis (in the case of univariable pre‐selection of factors only effects of the final models were considered), UA = univariable analysis.

³Loose housing; tie stalls.