Farming practices in Sweden related to feeding milk and colostrum from cows treated with antimicrobials to dairy calves

Table 4 Proportions of farms with different farm characteristics that feed calves different types of waste milk

Farm characteristics	Waste milk feeding
	WC¹		WT²		TWM³		WWM⁴
	% (n⁵)	p-value⁶	% (n)	p-value	% (n)	p-value	% (n)	p-value
Production type:
Organic	81 (86)	Ref.	67 (86)	Ref.	26 (84)	Ref.	58 (84)	Ref.
Non-organic	91(365)	0.019	90 (365)	<0.001	62 (361)	<0.001	84 (358)	<0.001
Herd size:
≥90 cows	90 (154)	Ref.	84 (157)	Ref.	52 (155)	Ref.	76 (154)	Ref.
60 – 89 cows	87 (150)	0.469	84 (148)	1.000	55 (146)	0.644	80 (145)	0.407
<60 cows	90 (148)	1.000	88 (147)	0.319	59 (145)	0.245	81 (144)	0.323
Housing:
Cold free stall	76 (46)	Ref.	76 (46)	Ref.	42 (45)	Ref.	64 (44)	Ref.
Warm free stall	91 (165)	0.011	84 (167)	0.276	54 (167)	0.182	78 (165)	0.052
Tie stall	92 (198)	0.007	89 (197)	0.031	60 (193)	0.031	84 (194)	0.006
Geographic location:
Southern Sweden and the Islands	89 (236)	Ref.	86 (237)	Ref.	67 (233)	Ref.	87 (234)	Ref.
Northern Sweden	88 (116)	0.719	88 (116)	0.739	43 (115)	<0.001	70 (115)	<0.001
Eastern Sweden	93 (86)	0.398	81 (85)	0.294	44 (84)	<0.001	69 (81)	0.001

¹ Colostrum from the first milking after calving, produced by cows treated with antimicrobials at dry off.
² Transition milk from cows treated with antimicrobials at dry off, produced from the second milking to the fourth day after calving.
³ Milk produced during the course of treatment by a cow that was given antimicrobial therapy during lactation.
⁴ Milk produced during the withdrawal period by a cow that was given antimicrobial therapy during lactation.
⁵ Number of farms in each category for which data on waste milk feeding and farm characteristics is available.
⁶ A p-value < 0.05 indicates significant differences between the reference level and other levels within each farm characteristic (Fisher’s exact test).

ISSN: 1751-0147