Milk Production Efficiency of Holstein Cows of Different Selection

Basonov, O.A.; Shkilev, N. P.; Arutyunyan, S.G.

doi:10.32651/1910-53

Cited by 2 publications

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“…Using the indicators of some genetic parameters (Lim, M ± m, σ, Cv, r, R1/2, R2/1, հ2) and selection intensity (P, u, i) calculated for experimental animals we have predetermined the selection efficiency of milk productivity of crossbred cows (1/4 Brown Caucasian x 3/4 Austrian Swiss), obtained by the breeding of F2 generation in itself, selected in the pedigree kernel during one generational change, having the selection differential (the difference of the average productivity of the selected animals and the herd) which is expressed by sigma (σ), defined by the formula𝑆𝑆𝑆𝑆 = 𝑖𝑖 × 𝜎𝜎, the specific weight (P) of the selected animals (pedigree kernel), the value of the selection intensity (i) which shows the difference of sigma of the minimum limit of productivity (V min) of the selected animals from the arithmetic average [9,11].…”

Section: The Results and Analysismentioning

confidence: 99%

Ways of improvement of herds, the development and verification of the mate selection method

Giloyan,

Kasumyan

2023

BIO Web Conf.

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The research was performed in Shahumyan “Agroservice” OSC cattle pedigree farm. The verification of the performed selection and mate selection by mathematical analytical method confirms that, by the targeted breeding of newborns obtained by the use of the bulls of Austrian Swiss breed, in the first birth of F2 generation it’s possible to increase the average productivity of the given herd from 2500 kg to 5734 kg. Thus, we suggest applying diagram 1 for the purposes of maintaining and improving the Brown Caucasian breed. Within the framework of the program of cattle breeding development in the Republic of Armenia for the period 2019-2024, established by RA government decree N 327-L of March 29, 2019, it’s been intended to replenish the herds with pedigree cattle of valuable production-economic features, instead of animals of unknown origin, unfit for reproduction and of low productivity, and to develop the pedigree work. It’s known that the cattle breeding in the Republic is performed with the generation obtained by free mating with underdeveloped bulls of low productivity. For this reason, underdeveloped calves of low living mass are born, and the considerable part of them are bred in insufficient conditions of feeding and stall housing, thus impeding the renewal and replacement of herds with heifers that meet the requirement of the breed first class living mass.

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Section: The Results and Analysismentioning

confidence: 99%

Ways of improvement of herds, the development and verification of the mate selection method

Giloyan,

Kasumyan

2023

BIO Web Conf.

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“…Within the framework of "Agro-Industrial Complex Development" national project implementation in the republics of the North Caucasus region, Holstein breed animals are imported from various countries, distinguished by high indicators of productivity. Under new conditions the imported animals are characterized by high productivity rates, which is due, along with the genotype, to paratypical factors [1,2,3,4,5,6,7,8,9]. At the same time, the problem of a more complete implementation of the productivity potential of imported animals and its preservation in subsequent generations, considering adaptation to new conditions of feeding and keeping, determination of immunogenetic status of animals of the Holstein breed remains relevant.…”

Section: Introductionmentioning

confidence: 99%

Immunogenetic status and breeding value of Holstein cows

et al. 2021

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In the genealogical structure of the breeding stock, the highest specific weight is occupied by the Reflection Sovering and Vis bek Aydiala lines, accounting for 56.8 and 39.9% of animals, respectively. The study results of Holstein cattle blood-group factors can be used to monitor its gene pool, genetic intrabreed differentiation, assess selection parameters, and conduct targeted selection of parental pairs. It was determined that in EAA blood group system in Holstein cows of reproduction from the USA, the frequency of A1 antigen is 58.7%, and in domestic reproduction animals, this antigen is found with a lower frequency of 50.7%. At the same time, in the specified system of blood groups in both groups of experimental animals, antigen “a” is characterized by the highest frequency, the lowest occurrence is A2 antigen, and animals with A1 antigen took an intermediate position. In EAB system, the US Holstein cows have a higher frequency of such antigens as Е3/, О3 и I1 compared to the reproductive animals of Agro-Soyuz LLC. The EAF blood group system is represented by two antigens, where F antigen frequency in both groups of experimental animals is 100%. Of all the blood group systems, the greatest differences between compared groups of animals were detected for the antigens of EAZ blood group system.

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Milk Production Efficiency of Holstein Cows of Different Selection

Cited by 2 publications

References 0 publications

Ways of improvement of herds, the development and verification of the mate selection method

Ways of improvement of herds, the development and verification of the mate selection method

Immunogenetic status and breeding value of Holstein cows

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