Effect of somatic cell count and mastitis pathogens on milk composition in Gyr cows

BMC Veterinary Research

Table 2 Final mixed linear regression models of the effect of mastitis-causing pathogens and somatic cell count on milk composition of composite milk samples in Gyr cows ¹

	Lactose, %			Protein, %			Fat, %			Nonfat solids, %			Total solids, %
Fixed effects	β	SE	P-value	β	SE	P-value	β	SE	P-value	β	SE	P-value	β	SE	P-value
Intercept	4.755	0.053		3.432	0.061		2.477	0.348		9.168	0.073		11.655	0.387
Seasonality²
Dry	Ref.	…	…	Ref.	…	…	Ref.	…	…	Ref.	…	…	Ref.	…	…
Rainy	−0.243	0.028	<.0001	0.391	0.032	<.0001	0.616	0.096	<.0001	0.141	0.038	<.0003	0.746	0.106	<.0001
SCC³	−0.0002	0.00001	<.0001	0.00004	0.00001	<.002	0.0003	0.00004	<.0001	−0.0001	0.00002	<.0001	0.0001	0.00004	0.002

¹ A total of 764 observations were used in this analysis. ²Seasonality (1 = rainy season, October to March; 0 = dry season, April to September), ³SCC: somatic cell count (x 1000 cells/mL), β: estimated coefficients, SE: standard error for the coefficient, Ref.: reference.

ISSN: 1746-6148