The paper explores the urgency of increasing efficiency of breeding Red-and-White dairy cattle that take the main part of the population in the Krasnoyarsk region (69.7%), the immunogenetic characteristics of animals that belong to Montwick Chiftein and Pabst Hoverner (n=52) lines. The research on the blood groups of cows were conducted in the laboratory of immunogenetic analysis of Krasnoyarskagroplem. The authors revealed the differences in the incidence of specific antigens in the cows of two lines. The article found out that antigens A’2, B2, E’3, O3, and T2 (P>0.95-0.99) were found to be more frequent in Montwick Chiftein line cows, and antigen P2 (P>0.95) wasfound in Pabst Governer line cows. It was also revealed that the most rare antigens in the Montwick Chifthein line are antigens A’, A’1, O2, O4, Y1, R1, X1, M and E’2, and antigens B’’, O4, U and U’’in the Pabst Governer line. Interestingly, the authors identified the antigens that were not present in the animals of both lines and in each line separately. The average index of antigen incidence in the cows of each line showed a relatively low value. Due to this the authors made a conclusion about a high degree of heterozygosity of the studied individuals. The index of genetic similarity among the animals of two lines demonstrates a high value of 0.863. The polymorphism of the antigens in the EAF-V locus was studied and a significant incidence predominance in cows of the F allele over the V allele was found out. The impact of genotype according to the EAF-V locus on dairy productivity and live weight of the cows was determined: in the Montwick Chifthein line, cows with the FF genotype (5986,60172,41 kg) had a higher yield, in the Pabst Governer line - with the FV genotype (5914,20208,19 kg). Animals of both lines that had genotype V/V had higher live weight parmeters than animals with genotypes F/V and F/F. The comparative analysis of the obtained results was carried out with the results of other Russian authors who conducted similar studies.
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.
Due to the fact that milk has a short shelf life, the issue of its freezing and long-term storage in the frozen state is relevant. A study was conducted on the effect of freezing on the milk quality after its defrosting of cows-mothers and cows-daughters of Red-Motley breed. As a result, it was established how milk quality indicators to change after five months of storage in a frozen state in cows of two age groups. A high correlation was established between quality indicators before and after freezing. The influence of the “freezing” factor on milk quality indicators was recognized statistically significant, the “generation” factor – not significant.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.