Dairy productivity and milk quality of daughters from bulls of Holstein breed

Abstract

A study of the influence of sires of Holstein breed on their daughters’ milk productivity, development and milk physical and chemical characteristics was conducted. The study was carried out in Krasnoyarsk Territory on red-and-white cows of the first and second lactations – daughters of three sire bulls: Arsenal, Zaryad and Veles. It was established that sires affect their daughters’ daily milk yield, lactose content in milk and milk solids non-fat (MSNF). The difference in traits between individual groups of bulls’ daughters is statistically significant. Analysis of variance showed that the paratypic factor defined as the age of daughters in lactations had a significant effect on daily milk yield. The genetic factor, that is father's heredity, influenced only the content of urea in daughters’ milk. Analysis of the correlation between daily milk yield and physical and chemical properties of milk revealed reliable correlated response of weak strength: in the daughters of the Arsenal bull (the second current lactation) it was between the traits of daily milk yield and protein, in the daughters of the Veles bull (the same lactation) it was between the traits of daily milk yield and MSNF, and daily milk yield and the freezing temperature of milk (FTM). In cows of the first lactation, a strong correlation was found between some physical and chemical properties of milk, such as fat and urea, urea and FTM, and MSNF and FTM. In cows of the second lactation, a strong correlation was found between the following traits of milk: protein and MSNF, protein and dry matter, lactose and MSNF, MSNF and urea, and some others. It is shown that sires of Holstein breed have an impact on certain productivity parameters of their cowdaughters. It is recommended to use the bull Arsenal 8492 more widely to increase the milk yield of their daughters, and Veles 5417 – to improve the quality of milk of their daughters.