The effects of clover-grass silage treated with acrylic acid on some parameters of cows' metabolism at the time of parturition and the state in their calves
1991
Vojtisek, B. | Hronova, B. | Hamrik, J. | Zezula, V. | Sisak, M. (Vyzkumny Ustav Veterinarniho Lekarstvi, Brno (CSFR)) | Jambor, V. | Zendulka, I. | Dvorak, R.
A trial was conducted with 16 cows divided into control and test group, test cows were given feed rations for 107 days which contained 16.0 kg clover-grass silage a day, treated with 3 l acrylic acid per t ensiled matter. Control group of cows was administered feed rations containing silage treated with 4 l formic acid per 1 t ensiled matter. In the blood (plasma) of test cows the alkaline phosphatase activity was increasing gradually, in the time after parturition a tendency of lower flucose, thyroxine and triiodothyronine concentrations was observed, and the phagocytal activity of leucocytes and its index decreased. The levels of ketone bodies and aspartate aminotransferase activity were found to be higher. In this period in urine the pH value and net acid-base output were lower, while the inorganic phosphorus concentration was higher. No differences were observed in colostrum density, liveweight of born calves and in the target metabolic parameters in the blood (plasma) of calves. In the 30-day period of investigation the cows of test group gave an average daily milk yield lower by 1.5 l (in comparison with control cows). The residues of acrylic acid were not detected in their colostrum and milk.
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