Effect of various forms and levels of selenium on milk productivity and resistance of lactating cows
| Autor: | M. G. Chabaev, R. V. Nekrasov, N. V. Bogoluybova, A. A. Zelenchenkova, E. Yu. Tsis |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Agrarian science. :36-40 |
| ISSN: | 2686-701X 0869-8155 |
| DOI: | 10.32634/0869-8155-2022-357-3-36-40 |
| Popis: | The effect of two forms of selenium, inorganic and organic, was evaluated in the study. Lactating cows of the 1st control group were fed 4.9 mg/head/day of inorganic form of selenium, cows of the 2nd, 3rd and 4th experimental groups received organic form of selenium in the amounts of 2.5, 3.7 and 4.9 mg/head/day. Researches show that application of organic form of selenium permits to increase average daily milk yield by 3.3, 12.9 and 10.8% (р < 0.05), while increasing of dry matter concentration in milk by 0.57% (р < 0.05) in comparison with the 1st control group. When administering selenium in organic form 3.7 mg/head/day, there was a tendency to increase in amount of casein and decrease in amount of somatic cells in milk by 0.13% and 33.7 thousand/ cm3 respectively (р < 0.1). A dose of 4.9 mg/head/day of organic selenium contributed to a decrease in amount of somatic cells by 29.3 thousand/cm3 (р < 0.05). Feeding experimental groups with organic form of selenium in different doses had a positive effect on the immune status and antioxidant activity of blood serum. The content of free water-soluble antioxidants (TAWSA) in blood serum was higher by 39.3 and 53.5% (р < 0.001) in cows of the 3rd and 4th experimental groups fed 3.7 and 4.9 mg/head/day of organic selenium. Thus, the use of selenium in organic form is the most effective and allows to reduce the amount of used micronutrient for replenishment of animal needs. |
| Databáze: | OpenAIRE |
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