Abstract
Black-and-white Holstein calves were studied. 3 experimental groups were formed: they included calves of two weeks of age, 10 animals each. The calves of the first group received “Intestevit” probiotic with milk at the rate of 3 doses per day for 1 animal for 15 days. The second group of calves, in addition to “Intestevit” preparation, also received selenium-containing preparation “Selen Plex™” at a dose of 1 mg/kg. The third group was the control group. Blood for testing was taken from the tail vein before the morning feeding and the start of preparation feeding, 30 and 60 days after the use of these preparations. Feeding “Intestevit” preparation to calves from 15 days of age for 60 days increases the following indicators relative to the control group: total immunoglobulins by 8.4%; Leukocyte phagocytic activity (LPA) - 10.5%; serum lysozyme activity (SLA) - 20.1%; serum bactericidal activity (SBA) - 4.6%; T-lymphocytes (absolute content) - 14.1%; B-lymphocytes (absolute content) - 1.5%. Feeding “Intestevit + Selen Plex™” complex preparation to calves from 15 days of age for 60 days increases the following indicators relative to the control group: total immunoglobulins by 11.7%; LPA - 12.1%; SLA - 15.8%; SBA - 7.6%; T-lymphocytes (absolute content) - 17.8%; B-lymphocytes (absolute content) - 2.2%.
Highlights
It is not possible to consider all aspects to satisfy animal boy needs in industrial animal husbandry
Selenium-containing preparations are used in animal husbandry
The presented data show that before using the preparations in all three groups, the level of this indicator was practically the same and amounted to 21.6 ± 0.4 g/l in the control group, 21.9 ± 0.4 l in the first experimental group, in the second experimental group 22.0 ± 0.5 l. 30 days after the start of “Intestevit” administration, the level of total immunoglobulins increased to 22.8±0.5 g/l, and in the group of calves that received Intestevit + Selen PlexTM preparations, 23.1±0, 3 g/l
Summary
It is not possible to consider all aspects to satisfy animal boy needs in industrial animal husbandry. An increase in the level of productivity of animals, their health will be associated with satisfaction of their physiological need for nutrients to contribute to implementation of their genetic potential To solve this problem, the most intense ontogenesis periods should be considered, when the future productivity of animals is formed. One of these methods is the use of probiotic and selenium-containing preparations in diets [9-14]. The study of selenium-containing and probiotic preparations effect on the specific resistance of growing calves is relevant. The study purpose was to analyze the state of nonspecific resistance in growing calves when using "Intestevit" probiotic and selenium-containing "Selen Plex TM" preparation in their diet
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