Quantitation of vitamins A and E in raw sheep milk during lactation period
¹Department of Chemistry, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, the Czech Republic 2Dairy Research Institute Ltd, Prague, the Czech Republic
In this article, the influence of breed and lactation stage on vitamin A and E content in raw sheep milk was studied. The milk of the East Friesian, Romanov and Lacaune sheep breeds was included in the study. The samples were taken once a month throughout lactation. The total average content of vitamin A in raw milk of all sheep breeds during lactation was 0.76 ± 0.19 mg kg-1 of milk and the total average content of vitamin E was 2.86 ± 0.99 mg kg1 of milk. The content of vitamin A and E during lactation varied in respect to the breed type. The highest average content of vitamin A and E was detected in the Romanov sheep:1.01 ± 0.19 mg kg-1 of milk for vitamin A and 4.26 ± 1.90 mg kg-1 for vitamin E. The lowest average value of vitamin A was found in the milk of the East Friesian sheep (0.56 ± 0.10 mg kg-1). This milk showed also the lowest content of vitamin E 2.11 ± 0.53 mg kg-1. The highest content of vitamins was found in summer and at the end of lactation, which is in September, and the lowest values appeared in early lactation, which is in April.