Dynamics of changes of carotene and vitamin A contents in cows after calving
1997
Krnic, J. | Valcic, J. | Romanic, S. | Jakic-Dimic, D. | Maricic, L. (Naucni institut za veterinarstvo Srbije, Beograd (Yugoslavia))
The investigation covered 12 cows of the Holstein race, which were 6.2 days before calving on the average, at the beginning of the experiment. Cows were divided into two groups of 6 animals each, with respect to treatment with vitamin A: a control group in which cows were not treated with vitamin A, and an experimental group in which cows were given i/m injections of vitamin A (AD3E-S, "Hemovet" - Vrsac, Yugoslavia) at the beginning of the experiment. The experiment showed that average concentrations of carotene and vitamin A in blood serum of cows before calving were in agreement with the referent values. Vitamin A and carotene contents dropped significantly 7.8 days after partus on the average, regardless of whether the animals had received vitamin A. On the 15th days after calving, the average concentration of vitamin A was close to the value established before partus, and the average carotene content was lower than before partus. Restoration of vitamin A content to the prepartal average concentration was more efficient in cows which were treated with AD3E-S before partus.
显示更多 [+] 显示较少 [-]