Realization of the genetic potential of milk production of purebred and crossbred cows

  • A. Perekrestova
Keywords: cows, genotype, hybrids, lactation, milk yield, production of milk fat and protein.

Abstract

The article presents the research materials on the implementation of the productive qualities of purebred first-heifers of Schwyz breed and first-generation hybrids from crossing Ukrainian black-white and red-white dairy breeds with Schwyz bulls throughout the all lactation period.It was established that the hybrid first-heifers F1½UKRM×½Sh for the entire first lactation period, secreted 7901,3 kg of milk, whereas from the cows F1½UChRM×½Sh,8269,2 kg of milk were obtained, which is more by 4,45 % (P<0,001). A substantially higher level of productivity in purebred Schwyz first-heifers, which a milk yield of9228,5 kg, that is, more than 14,38 and 10,39 % of hybrid first-heifers cows, respectively (P <0,001). From the Schwyz cows received for all lactation9438,1 kg of milk in terms of 4 %, which is more than the physical weight by 2,22 % (P<0,01).It is proved that the average daily milk yield in first-heifers of different genotypes grows from the first lactation month and the maximum value is reached on the fourth. Moreover, the highest growth rate of milk yields is observed in young cows, provided low yield on the first month of lactation. Beginning with the fifth month of lactation in cows of different genotypes, the curve of milk yields has a smoothly declining character.From Schwyz cows was obtained an average of 383,1 kgof milk fat production, whereas from the hybrids F1½UChRM×½Sh only 315,6 kg, which is less by 21,39 % (P<0,001). The lowest indicator of production of milk fat in hybrid first-heifers F1½UKRM×½Sh and is284,2 kg, which is inferior to the value of purebred first-heifers of Schwyz by 34,80 % (P<0,001).The Schwyz first-heifers produced 318,8 kgof milk protein for the entire lactation period. At the same time, this production in the first-heifers F1½UChRM×½Sh is 280,7 kg, which is less by 13,57 % (P <0,01). The relatively low indicator of milk protein production has hybrid F1½UKRM×½Sh, from which only258,9 kg was obtained, which is lower than the value of the Schwyz first-heifers for 23,14 % (P<0,001).

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Published
2017-07-07
Section
Agricultural sciences (animal husbandry)