LEVEL BETA-CAROTENE AND VITAMIN A IN BLOOD SERUM OF PREGNANT AND HIGHLY LACTATING COWS FED WITH DIFFERENT COMPOSITIONS
Bisa Radović, Jasmina Janjić, Milinko Milenković, Boban Jašović,
Atanas Nitovski, Valentina Milanović
Univerzitet u Prištini ‑ Kosovska Mitrovica, Poljoprivredni fakultet, Lešak, Serbia
bisaradovic@yahoo.com
.The studies were conducted on the farm of Simmental cows where five groups of 12 cows were formed in which concentrations of beta-carotene and vitamin A in blood serum were tested. In the first group were highly pregnant cows, and in the other four groups were cows from the first to the fifth months of lactation. The composition of a meal of high pregnant and lactating cows in terms of the types and amounts of certain nutrients were different. In the obtained average values of beta ‑ carotene in the blood serum of cows between the groups there was not statistically significant different. The lowest value of beta ‑ carotene in relation to the other groups, was in the serum of the cows in the first month of lactation (x = 3,39 ± 0,27 mmol/l). The average concentration of vitamin A was statistically significantly lower in cows in the first month of lactation (x = 76,67 ± 6,39 IU) compared to cows that were in the fourth (x = 112,03 ± 8,76 IU) and the fifth month of lactation (x = 118,90 ± 8,29 IU), (p<0.01), as well as in high-pregnant cows (x = 81,33 ± 3,59 IU) compared to cows in the fifth month of lactation (p<0.01). Our research has not confirmed the connection between the concentration of beta-carotene and vitamin A in the blood serum of tested cows.
Keywords: beta-carotene; vitamin A; cows
|
