Productivity, protein in milk and blood of the Holstein cows: dependence on the protein content in the feed

When optimizing and enriching the fodder with protein the milk yield of Holstein cows can increase. The aim of the investigation is to determine dependence of milk yield on protein content in milk and blood of animals and protein content in the fodder of the Holstein cows. Scientific and practical experiments according to the principle of pairsanalogues at the animal production unit of JSC «Avangard» in Stenkino, Ryazan region were carried out. The feed consumption by animals was determined with the help of weighing the fodder and its remainder each decade. Milk yield was determined in accordance with every month control milking with succeeding calculation of milk yield for 305 days of lactation. Double milking in milk pipes was applied. Milk samples were chosen individually. Milk quality was determined at the farm lab with the help of device «Klever-2М». We have studied milk content and its physical-chemical indices during the second and third months of the first three lactations. We have taken the animals’ 10 ml blood samples from the iugular in the morning before feeding and watering. The total protein in the blood at was determined at the Ryazan regional vet lab. The main difference in the fodder of milking cows of the control and experiment groups has been in substituting part of the mixed fodder with corn gluten. The contents of the crude and digestable proteins were 3020 and 4230 gr versus 2416 and 3384 gr in the control and experiment diets correspondingly. It was found that the yield of the experiment cows increased by 563,3 kg on the average for 3 lactations. Protein concentration in the blood of the experiment animals was by 21 % higher than that of the control ones. The visual and regression analyses allowed analyze the data received and make a diagram of some basic data sequences, for instance milk yield, protein in blood and milk depending on protein content in the fodder.

Holstein, fodder, corn gluten, milk yield, protein in blood, protein in milk, scatter diagram, regression analysis