Effect of probiotic preparation on goat milk quality

Abstract

The effect of the experimental probiotic drug "Plantarum" on the physico-chemical and microbiological parameters of milk of crossbred dairy goats was studied. This preparation was developed in the laboratory of microbiology of milk and dairy products of the Siberian Research Institute of Cheese Making of the Federal Altai Scientific Center for Agrobiotechnology. The preparation includes pure cultures of probiotic strains of lacto- and propionic acid bacteria from the "Siberian collection of microorganisms". Scientific and economic experiment was conducted in 2018-2020 on the territory of the Pervomaisky district of the Altai Territory. The objects of the study were crossbred dairy goats. In order to evaluate the effect of the experimental probiotic drug "Plantarum" on the milk quality of the experimental animals, four groups (20 animals in each group) of pregnant goats were formed: one control and three experimental. The goats of the experimental groups were fed the probiotic drug "Plantarum" in addition to the basic diet at the doses of 0.4, 0.6, and 0.8 ml/kg of body weight/day. The results showed that the content of the mass fraction of fat and protein in the milk samples of all experimental groups were within the norm for this type of animals regulated by GOST 32940-2014. It should be noted that the use of different doses of probiotic increased the fat mass fraction in milk from 0.06 to 0.13% and the protein mass fraction by 0.12% relative to the control. Physicochemical parameters (dry skimmed milk residue, titratable acidity, somatic cells) of milk of the experimental goats were within normal limits; no significant differences between the groups were found. There was a tendency to reduce the bacterial contamination of milk in the experimental groups compared to the control when determining the number of mesophilic aerobic and facultatively anaerobic microorganisms.