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

Table 2 General characteristics^a of the 9 herds

Characteristic		Herd
Characteristic		1	2	3	4	5	6	7	8	9
	Breed	Holstein	Holstein	Holstein	Holstein	Jersey	Rendena	Rendena	Simmental	Simmental
	Cows, n	76	77	123	107	112	89	40	101	31
	DIM, d	156 (135)	174 (115)	353 (130)	251 (108)	176 (132)	229 (140)	234 (111)	195 (96)	167 (111)
	Parity	2.46 (1.77)	2.29 (1.21)	2.93 (2.17)	1.96 (0.94)	1.80 (0.92)	3.11 (2.09)	3.35 (2.43)	2.90 (1.73)	2.84 (1.59)
	Milk yield, kg/d	32.52 (9.98)	34.06 (8.38)	20.66 (8.62)	31.67 (6.57)	23.48 (6.95)	16.41 (6.04)	23.86 (5.92)	31.54 (7.86)	25.16 (6.01)
	SCC, cells/mL	41,500	80,000	102,000	55,000	85,000	166,000	65,000	48,000	93,000
Major^b	S. agalactiae	✔	✔		✔	✔	✔	✔	✔
	S. uberis	✔	✔	✔	✔	✔	✔	✔	✔	✔
	S. dysagalactiae	✔	✔	✔	✔	✔	✔	✔	✔	✔
	S. aureus		✔	✔	✔	✔			✔	✔
	E. coli	✔	✔	✔	✔	✔	✔	✔
	Klebsiella spp.	✔	✔	✔		✔		✔	✔
Minor^b	CNS	✔	✔	✔	✔	✔	✔	✔	✔	✔
Other^b	M. bovis	✔	✔	✔	✔	✔	✔	✔	✔
	Mycoplasma spp.		✔	✔			✔		✔	✔
	Enterococcus + L. lactis ssp. Lactis			✔	✔	✔	✔	✔	✔
	Prototheca spp.			✔	✔		✔

^aMean (standard deviation) for DIM, parity, and milk yield, median for SCC, and presence (✔) of pathogens DNA in at least one cow. P
^bPathogens of the commercial kit 'Mastitis 4BDF'. CNS indicates the coagulase-negative staphylococci

ISSN: 1746-6148