REPRODUCTIVE ABILITY, PRODUCTIVITY AND QUALITY OF COWS' MILK AFTER THE APPLICATION OF A BIOLOGICALLY ACTIVE PREPARATION
Abstract
In connection with the low fertility of cattle, scientists and experts pay considerable attention to the problems of the reproductive capacity of animals of this species. In addition, as in all mammals, the birth of offspring in dairy cows leads to lactation, which leads to many morpho-functional changes in the neuroendocrine regulation of metabolic processes in the female body, which negatively affects the signs of reproductive ability of cows. But there is another problem that most scientists pay little attention to – the impact of the process of restoring the reproductive cycle of dairy cows on the level of their milk productivity, especially in the first months of lactation, and on the quality indicators of milk raw materials, namely the content of protein and fat. The purpose of the study was to study milk productivity and milk quality in dairy cows after administration of the bioactive drug "Glutam 1M" during the last decade of pregnancy. Milk productivity and quality indicators of cows' milk were determined based on the results of control milkings and actual milkings in accounting journals. We calculated the milk productivity of cows for one, two, three first months of lactation after calving, expectations for 305 days, per lactation. In the conditions of the laboratory of the department of technologies of production, processing and quality of animal husbandry products of the Polish National University, according to standard methods, the content of fat (acid method) and protein (refractometric method) in milk was studied. Administration of the biologically active drug "Glutam 1M" to cows, starting from the 270th day of pregnancy, the insemination index was probably (p<0.01) lower by 35% (0.67), signs of the first sexual desire appeared 7.9 days earlier and service the period was probably shorter by 20.23 days, compared to the control. The introduction of the drug "Glumat 1M" did not affect the quality indicators of milk, namely the mass fraction of fat and protein, the fluctuation of the above indicators occurred within the margin of error. With the increase in the indicators of reproductive capacity in the cows of the research groups, there was no decrease in milk productivity and deterioration in the quality of milk raw materials.
References
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