2019
DOI: 10.32651/1910-53
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Milk Production Efficiency of Holstein Cows of Different Selection

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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%
“…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%
“…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%