Productive qualities of holsteinized black-and-white cattle

Abstract

In Sverdlovsk region Holsteinized black-and-white cattle of Ural type are bred. This livestock is represented by highly productive animals with a high genetic potential for productivity. The aim of the research is to study the productive qualities of the Holsteinized black-and-white cattle with a high proportion of blood relationship to Holstein breed. Milk yield increases with age of cows. The difference between the first and second lactation amounts to 1.084 kg or 11.4%, and between the second and third lactation it is 326 kg (3.0%). In general, the milk yield of mature (full-aged) cows was higher by 1.410 kg or 14.9% than the milk yield of first-calves It is known that mature full-aged cows have a productivity 30% higher than the first-calves. I. e. the genetic potential of the farm broodstock of full-aged cows is within 12.595 kg, and this potential is not fully used. The farm uses cows that are quite different in terms of milk yield. The fluctuations in milk yield from lactation to lactation are 7.060 kg (1st lactation), 10.210 kg (2nd lactation) and 6.785 kg (3rd lactation). In terms of the milk quality indicators – MFF (mass fraction of fat) and MFP (mass fraction of protein) no significant differences in lactation were established, although a certain positive tendency was observed for increase of MFF with age gaining in reference to the first-calves.

Assessment of influence of duration of the service period on the milk yield of cows

“…For its production, highly productive dairy cattle are used, the main livestock of which is represented by related breeds of Dutch origin -Holstein, Black-and-White mottled breed, etc. [13][14][15].…”

Influence of kappa-casein genotype on milk yield of cows and on culling of cows

“…A large array of Holsteinized black-and-white mottled cattle was derived in many regions of our country. Those breeds differ among themselves in economically useful traits and exterior features; the differences and features are related to the breeding zone and breed resources used in the crossing [7][8][9][10][11][12].…”

“…(7)(8) 2022 Agrarian science Аграрная наука ISSN 0869-8155 (print) ISSN 2686-701X (online) BREEDING, SELECTION, GENETIC РАЗВЕДЕНИЕ, СЕЛЕКЦИЯ, ГЕНЕТИКА…”

Correlation of productive longevity and reproductive functions in dairy cows

“…[14]. The genetic pool of the Holstein breed, which is considered the best dairy breed in the world, has been widely used for more than four decades, and it keeps being used to improve domestic livestock genetics, including the black-and-white mottled breed in order increase high milk yield and improve technological parameters in industrial production of milk [15]. The large array of Holsteinized black-and-white mottled cattle has been derived, which type of cattle features high proportion of Holstein breed genes.…”