Prediction of Vitamin A, Vitamin E, Selenium and Zinc Status of Periparturient Dairy Cows Using Blood Sampling During the Mid Dry Period

Table 1 Least square mean (SE) concentrations of serum vitamin A (S-vit A) and vitamin E (S-vit E), plasma Se (P-Se) and serum zinc (S-Zn) in blood samples taken at 5 time points around calving from each of 20 dairy cows.

Variable	Units	Mean (SD) days relative to calving*
		-32 (5)	-11 (4)	2 (2)	7 (2)	28 (3)
S-Vit A	mg/l	0.36 (0.01)^a	0.33 (0.02)^ab	0.21 (0.01)^c	0.27 (0.02)^bc	0.40 (0.02)^a
S-Vit E	mg/l	3.80 (0.05)^a	3.10 (0.05)^ab	2.30 (0.05)^c	2.96 (0.05)^bc	5.20 (0.05)^d
P-Se	mg/l	0.075 (0.003)^ab	0.072 (0.003)^a	0.070 (0.003)^a	0.083 (0.003)^b	0.081 (0.003)^b
S-Zn	mg/l	0.84 (0.03)^a	0.75 (0.03)^ab	0.63 (0.03)^b	0.71 (0.03)^ab	0.77 (0.03)^a

* Values with different letters within each row differ significantly (P < 0.05).

ISSN: 1751-0147