THE ROLE OF BIOCOMPLEXES IN THE METABOLISM OF PRODUCTIVE ANIMALS

Abstract

We have established a rather important role of calcium-protein complexes of blood during lactation. Highly productive cows with a milk yield of up to 6,000 kg of milk and with a milk yield of 2,000-3,000 kg per lactation were studied. It turned out that there were significantly more complexes in the blood of high-yielding cows than in medium-yielding cows, while the content of total calcium in the blood of cows during lactation changed slightly in both the first and the second. The amount of calcium bound to albumins significantly decreases during lactation and becomes the lowest during the dry period (6 times less than the norm). In the blood of high-fat dairy cows (Jerseys), the content of cholesterol-albumin complexes is always higher (by 20% or more) than in moderately fat dairy cows (for example, black and spotted). The number of phosphatide-protein complexes in the former was always higher by 30% or more than in the latter, despite the fact that the content of total protein in the serum is less in Jerseys than in black-spotted cows. With a decrease in milk yield, the ability of blood albumins to bind phosphatides in high-fat dairy Jersey cows was always 30-40% higher than in black and spotted cows. Research results indicate that in the blood of beef cows, almost all cholesterol is in the form of complexes with proteins and, above all, with serum albumins. With animal diseases (endometritis, paresis, litter retention, etc.), the number of these biocomplexes decreases sharply, and the content of free cholesterol increases sharply (sometimes 8-10 times against the norm). At the same time, the number of cholesterol-globulin complexes in sick animals increases.