Influence of lowered protein level on scar fermentation, metabolism and cow productivity

As a result of our research, we have identified the negative effects of lowered protein levels on scar fermentation, metabolism and animal productivity. In cows of the experimental group, the decrease in the number of amylolytic microorganisms was accompanied by a higher content of proteolytic, (1,16 times p <0,05) and cellulosolytic microorganisms (1,08 times). However, with higher quantitative content of proteolytic and cellulosic microorganisms in the rumen of the cows that received the lowered protein intake with diet rations, the total mass of microorganisms was 1,17 times less than that of control group cows. The specific activity of the main groups of the microorganisms of the rumen was more in the control group of cows: amylolytic in 1,31 times (p <0.01), proteolytic in 1,14 times (p <0,05). Total nitrogen in the control group of cows was detected (124,93 ± 21,79 mg%, at 110,60 ± 18,56 mg%), in the experimental group (1,13 times, p <0,05), the content The residual nitrogen in the rumen of animals of both groups practically did not differ and ranged from 33,60 ± 2,97 to 38,15 ± 2,94 mg%. This provided a higher content of protein nitrogen in the control group rats (1,28 times, p<0,01). For 5, 6, 7 months of lactation (II lactation period), on average, from animals of the control group received 432,6 liters of 4 % milk, and from cows of the II group – 409,6 liters. Average daily milk yield was 4% of milk in animal groups, respectively: 13,88 and 13,05 kg. Expenditures per liter of milk of feed units amounted to natural milk at 0,96 in the control group and 0,89 in the experimental groups, and by 4% in milk, this figure was 1,0 and 0,92, respectively. Reducing the level of digestible protein in the ration of cows in the following months of lactation (8, 9, 10), also negatively affected the flow of metabolic processes, and some of their tension was noted during the experiment. During the next (III) months of lactation (on eaten feeds), cows of the control group received 105,08 g of digestible protein per 1 k. od. and 85,78 g in the experimental group animal, which corresponded to 100% in control and 18,3% in protein, respectively (81,7 %) in the experimental group.