The Abstract reviews the experience of implementing Vytelle technology in ZhanaBereke LLP, Akmola region in Kazakhstan. The trial objects are Qazaq Aqbas bull calves: group 1 aged 10–11 months (n = 22), group 2 aged 11–12 months (n = 24). Data analysis showed that more reliable Residual Feed Intake calculated for each individual animal on the basis of their phenotypes and information on pedigree, were found in group 1. The average RFI EPD for group 1 is -0.0607, for group 2 is -0.0297. The RFI% Rank in terms of RFI EPD for both trial groups varied within 4 ... 96%. However, the average RFI% Rank was lower in the first group (45%) compared to the second group (56%). From which it follows that the RFI EPD is higher in group 1. Average Daily Gain EPDs (ADG EPD) higher in group 1 -0.0018. A higher ADG EPDs indicate a more cost-effective metric. The ADG% Rank in terms of ADG EPD for group 1 varied within 1 ... 62%, for group 2: 1 ... 63%. The average ADG% Rank was slightly lower in the first group (30%) compared to the second group (33%). From the presented data, it follows that the breeding valueaccording to the ADG EPD is higher in group 1. The average Dry Matter Intake by animals per day during the trial (DMI EPD) is equal to -0,0600 in the first group, and -0,0292 in the second group. The DMI% RANK in terms of DMI EPD for group 1 varied within 31 ... 93%, for group 2: 38 ... 96%. The DMI% RANK was lower in the first group (60%) compared to the second group (67%). Summarizing the above, we can conclude that selection for this characteristic is less effective, work will continue to increase this indicator.

Selection for residual feed intake (RFI) allows you to reduce feed costs and increase productivity of beef cattle. An increase in feed productivity by 10% can lead to an increase in profits by 43%, raising livestock with a low RFI can reduce feed intake by 12%, reduce methane emissions by 30%, and manure reduction by 17%. To obtain reliable trial results when determining the RFI, it is necessary to ensure the following conditions: 1) the same age of animals 2) the exchange of pedigree data between users of the system, which makes it possible to compare the EPDs within Vytelle Systems. Objects of research:QazaqAqbas bull calves (n = 46) at the age of 10–12 months in ZhanaBerekeLLP in Akmola region of Kazakhstan. Trial results confirm that residual feed intake in group 1 varied from -0.81 to 1.11, in group 2 - from -0.80 to 1.09. The RFI Rank was higher in group 1 (12.5). RADG in group 1 was at the level of -0.57 ... 0.58, in group 2 - -0.58 ... 1.13. According to the numerical rating of the animal (RADG Rank), the average value in group 1 was 12.5, in group 2 - 11.5. The average live weight at the beginning (START WT.) and end (END WT.) in the first group was 254.16 and 287.62 kg, in the second group 239.99 and 273.09 kg. The ADG in two groups was at the same level - 0.70 and 0.69 kg. The average Dry Matter Intake per day by animals during the trial was higher in the first group - 4.15, in the second group it was 3.65. For the first time in Kazakhstan national QazaqAqbas breed is tested for RFI, RADG, ADG, DMI, Raw F:G, Adj F:G.

No abstract

One of the main ways to increase the milk production of cows and extend the terms of their use is targeted breeding work. Currently, the long-term economic use of cows on average in Kazakhstan is 3.2 lactations. Thus, cows do not live up to 4–6 lactation, when the highest productivity is manifested and the costs of raising heifers, pregnant heifers and keeping productive animals pay off. (Komarov V.Y, 2019)In this regard, we studied the duration of the economic use of cows, taking into account their lifelong productivity. Objective and research technique. The purpose is to study the duration of the productive use of cows and the reasons for their replacement at Aina Dairy Farm LLP. The subjects of this research were 631 Holstein cows. An analysis of the reasons for culling cows at Aina Dairy Farm LLP showed that up to 25% of cows were replaced with udder diseases, up to 50% with hoof and limb diseases, up to 15% with reproductive dysfunctions, and only 10% in terms of productivity and age. Cows who left during the first lactation and didn’t manage to recoup the costs of growing, which caused a loss to farms, make up 30% of all rejected. Cows who left on the second lactation and only recouped their own costs and didn’t bring profit, make up 25%. (Serikbaeva A.K.,Tilepova A.K.,2020) To achieve this goal, the following tasks were solved: identifying the reasons for the cows to be replaced, determining the replacement age, calculating productive longevity and the dynamics of its change in calving. Analysis of productive longevity showed that a large number of cows are replaced from the herd during the first and second lactation, mainly due to health problems associated with metabolism. The main cause of morbidity is feeding, milking and milking conditions.