Productive Longevity of Cows With Different   Stress Resistance

Abstract. Resistance to stress in cows depends on factors such as age, gender, fatness, body type and heredity. The effects of long-term stress factors on the dairy herd cause hard-to-recover damage during production. The purpose of our research was to assess the types of stress resistance of mother cows and their offspring. Methods. The stress tolerance index of the studied animals was calculated according to the method of N. A. Safiullin and others. This method includes the impact on animals during machine milking of a stress factor and changes in milk production indicators, determining the stress resistance indicator of cows by the average value of the sum of estimated indicators: the ratio of 1 % milk, changes in the intensity and completeness of milk production, the duration of the latent milking period. Results. It was found that the most stress-resistant animals were less productive (8000 kg and less for maximum lactation). The stress tolerance index in the mother cows of this group is on average 0.137 (p < 0.001) higher than in other animals evaluated. At the same time, their descendants also had a stress tolerance index higher than in other evaluated groups by an average of 0.041 (p < 0.01). A high type of stress tolerance was determined in 75.0 % of heads in the group of cows-mothers with the lowest productivity for maximum lactation. Slightly less animals with a high type of stress resistance in the group of their descendants – 33.0 % of heads. At the same time, in these groups of mothers and daughters, cows with a low type of stress resistance were not found at all. Repeatability coefficients indicate that in low-yielding mother cows, the stress tolerance index is repeated in groups of daughter cows to a much lesser extent (at r = 0.26) compared to groups of high-yielding cows. The scientific novelty lies in the fact that the indicators of stress resistance of cows and their offspring are established depending on the highest productivity of mothers.

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Assessment of the type of stress tolerance mother cows and their descendants

Донник

Loretc

Chechenihina

et al. 2020

Agrarian Bulletin of The

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Stress resistance and dairy productivity of cattle in the Urals depending on milking technology

Chechenihina

Smirnova

Stepanova³

2022

Agrarian Bulletin of The

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Abstract. In modern conditions of intensification of the agro-industrial complex of our country, the level of influence of stress factors on the indicators of dairy productivity of cattle is an urgent topic for research. According to scientists, the stress resistance of the animal body is characterized by a number of hormones, such as prolactin, adrenocorticotropic hormone and cortisol. The scientific novelty lies in the study of the level of stress resistance of cattle with the use of intensive technologies. The purpose of our research work was to analyze the indicators of stress resistance and dairy productivity of cattle in the Urals, depending on the milking technology. Research methods. Scientific work was carried out in breeding herds of black-and-white cattle in the period 2016–2019 on the basis of agricultural enterprises of the Tyumen and Sverdlovsk regions. Distributing the evaluated heifers by types of stress resistance, the level of hormones in their blood was determined during the first lactation in the laboratory using STEROIDIF tests. Results. As a result of the analysis, it was found that in the groups where milking was used in the milk pipeline, animals with a high type of stress resistance had 22.6 % more heads compared to the groups of robotic milking. At the same time, it was noted that the first heifers with an average type of stress resistance during milking by a robot milker are a quarter more than in groups of cows when milking in a milk pipeline. Consequently, the first heifers adapt better to robotic milking. Milk yield is higher for first-time heifers milked with the help of a robot milker compared to linear milking. The difference in this case was more than 700.0 kg (17.3 %) in the studied herds. We recommend that when selecting first-calf cows for intensive milking in breeding herds of the Urals, along with generally accepted assessment indicators, the level of stress resistance of animals should be evaluated.

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Stress tolerance of black-motley breed cows in the Urals region

Донник

Chechenihina

Smirnova

2022

Agrarian Bulletin of The

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Abstract. In the Urals, one of the numerous breeds of cattle for the production of dairy products is common – black and motley. In recent years, there has been a tendency to decrease the level of livestock with an increase in their productivity indicators and a decrease in the duration of economic use. Scientific novelty. An assessment of the types of stress resistance of cows-daughters from among the first heifers, depending on the highest milk productivity of their mothers, was carried out, bulls-improvers were identified by the type of stress resistance of daughters. The purpose of the research was to study the stress resistance of cows of the black-and-white breed of the Urals. Research methods. The work was carried out in cattle herds of high-tech breeding enterprises of the Sverdlovsk region. 3315 daughters of 34 bulls-producers of various lines were evaluated to identify bulls-improvers on the stress resistance of offspring. The assessment was carried out in two stages: 1) breeding bulls were selected whose daughters did not reduce milk yield with seasonal changes in conditions of detention; 2) bulls whose resistance rank did not exceed the rehabilitation rank were identified by the method of overlapping breeding fields. At the same time, the reaction of the daughters of bulls to stress was assessed using the indices of reduction (Id) and recovery (Ir) of the value of milk yield per month. Results. It was found that the cows-daughters of the evaluated bulls-producers differed in the level of resistance to seasonal changes in housing conditions. Reliable bulls-improvers in terms of the level of stress resistance of offspring have been identified: Potter 128367894, Stardel 658867, Marcos 131801949 and Thaler 4091. The low type of stress resistance of cows-daughters was noted in the group of highly productive cows-mothers – 25 % of heads. In addition, the dependence of the level of stress resistance with the origin of cattle is also noted by other scientists, which confirms the need to carry out breeding work with dairy cattle with the inclusion of stress resistance of animals in the selection indicators.

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Productive Longevity of Cows With Different Stress Resistance

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Assessment of the type of stress tolerance mother cows and their descendants

Assessment of the type of stress tolerance mother cows and their descendants

Stress resistance and dairy productivity of cattle in the Urals depending on milking technology

Stress tolerance of black-motley breed cows in the Urals region

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