Table 3. Seasonal changes of vitamin A and E concentrations on sows serum, colostrum and milk.

	Winter	SEM	Summer	SEM	p-value
Vitamin A µg/mL
Serum
Gestation (100 d)	0.19	0.01	0.19	0.01	0.772
Post-partum (21 d)	0.29	0.01	0.22	0.01	< 0.001
Colostrum	1.38	0.15	1.23	0.15	0.503
Milk	0.42	0.02	0.38	0.02	0.25
Vitamin E (µg/mL)
Serum
Gestation (100 d)	2.00	0.10	0.90	0.10	< 0.001
Post-partum (21 d)	1.40	0.16	0.96	0.18	0.39
Colostrum	8.48	0.68	8.29	0.69	0.92
Milk	2.23	0.11	1.81	0.12	0.03

SEM, standard error of the mean.