α-Tocopherol and β-carotene concentrations in feed, colostrum, cow and calf serum in Swedish dairy herds with high or low calf mortality

Table 1 Results of univariable analyses (continuous variables), tested for associations with type of herd (high mortality/low mortality)

Model/variable	High mortality			Low mortality			P value^a
Model/variable	25 pct.	Median	75 pct.	25 pct.	Median	75 pct.	P value^a
Model feed^b (n = 57)
Herd size 2008/09	154	175	222	141	151	170	0.28
% Grass silage of total diet	27	37	42	29	41	60	0.45
Model colostrum^b (n = 162)
Fat^c (%)	3.44	4.95	7.30	2.65	3.82	6.56	0.10
Herd size 2008/09	154	175	222	141	151	170	0.34
Total solids (Brix%)	21.2	23.4	26.1	19.9	22.4	25.1	0.20
Model cow (n = 189)
Herd size 2008/09	154	175	222	141	151	170	0.28
% Grass silage of total diet	27	37	42	29	41	60	0.45
Model calf^b
Herd size 2008/09	154	175	222	141	151	170	0.28
Median herd level concentration of vitamin (α-tocopherol/β-carotene) in colostrum (µg/mL)	0.59/0.07	0.90/0.11	1.19/0.17	0.72/0.08	1.07/0.15	1.44/0.20	0.030/0.18

^aTested with univariable logistic regression, with cluster on herd, of its association with type of herd (high mortality/low mortality)
^bOutcome transformed with a natural logarithm (ln) to approximate normal distribution
^cFive missing values

ISSN: 1751-0147