Presence of pathogen DNA in milk harvested from quarters is associated to changes in cows’ milk yield and composition

Table 6 Contrast estimates^a (standard error) for milk traits within pathogens group^b

Trait^c	Absent vs. present	Absent vs. minor	Absent vs. major	Absent vs. other	Minor vs. major	Minor vs. other	Major vs. other
SCS	-5.69 (1.00)***	-1.23 (0.39)**	-2.33 (0.35)***	-1.23 (0.39)**	-1.10 (0.37)**	-0.89 (0.57)	0.21 (0.54)
DSCC, %	-34.95 (8.53)***	-7.78 (3.32)*	-14.63 (2.93)***	-7.78 (3.32)*	-6.84 (3.13)*	-4.75 (4.81)	2.09 (4.54)
DSCS	-6.47 (1.16)***	-1.40 (0.45)**	-2.67 (0.40)***	-1.40 (0.45)**	-1.27 (0.42)**	-0.99 (0.65)	0.28 (0.62)
Milk yield, kg/d	4.54 (3.60)	1.60 (1.39)	2.32 (1.24)	1.60 (1.39)	0.72 (1.33)	-0.96 (2.05)	-1.68 (1.94)
Fat, %	-0.63 (0.40)	-0.14 (0.16)	-0.019 (0.14)	-0.14 (0.16)	0.12 (0.15)	-0.34 (0.23)	-0.46 (0.21)*
Protein, %	-0.21 (0.18)	-0.002 (0.07)	-0.03 (0.06)	-0.002 (0.07)	-0.03 (0.06)	-0.17 (0.10)	-0.14 (0.10)
Casein, %	-0.13 (0.16)	0.01 (0.06)	-0.001 (0.05)	0.01 (0.06)	-0.01 (0.06)	-0.16 (0.09)	-0.15 (0.08)
Casein index	0.009 (0.008)	0.004 (0.003)	0.01 (0.00)**	0.004 (0.003)	0.004 (0.003)	-0.007 (0.004)	-0.010 (0.004)
Lactose, %	0.08 (0.10)	0.04 (0.04)	0.10 (0.04)**	0.04 (0.04)	0.06 (0.04)	-0.11 (0.06)	-0.16 (0.06)

^a***P ≤ 0.001, **P ≤ 0.01, *P ≤ 0.05
^bDescription of groups is provided in Table 2
^cSCS Somatic cell score, calculated as SCS = 3 + log₂(SCC/100,000), where SCC is somatic cell count (cells/mL), DSCC Polymorphonuclear neutrophils and lymphocytes (%) out of the total SCC, DSCS Differential somatic cell score, calculated as DSCS = 3 + log₂(DSCC_N/100,000), where DSCC_N is the combined number of polymorphonuclear neutrophils and lymphocytes in milk (cells/mL)

ISSN: 1746-6148