A comparison of the milk yield and morphometrics of Irtysh type Simmental cows and their Holstein and Simmental crosses in East Kazakhstan

Оценка влияния длительности сервиспериода на молочную продуктивность коров РЕЗЮМЕУральский тип отечественной черно-пестрой породы отличается высокими показателями продуктивности, хорошей пригодностью к использованию в условиях промышленной технологии молока, но длительность его продуктивного долголетия составляет 2,4-2,6 лактаций. Снижение продуктивного долголетия связано, в частности, с воспроизводительными качествами. В результате проведенных исследований установлено, что за счет удлинения продолжительности лактации (свыше 305 дней) получено больше молока на 847-890 кг, или на 9,5-10,0%. При этом наблюдается снижение МДЖ и МДБ в молоке за 305 дней лактации: на 0,01-0,02% по жиру и на 0,02% по белку. Наиболее высокие среднесуточные удои установлены при длительности лактации 305 дней. У дочерей всех оцениваемых быков-производителей была одинаковая продолжительность сервис-периода -132-134 дня. Она была выше оптимальных показателей на 52-54 дня, или на 65-68%. Индекс плодовитости коров превышает 48%, поэтому можно говорить о том, что плодовитость у коров хорошая. Потенциал плодовитости маточного поголовья хороший и сокращение длительности сервис-периода позволит повысить эффективность молочного скотоводства в хозяйстве.

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“…The increase in the livestock productivity led to decrease in productive longevity due to decline in the cows reproductive functions [19,20].…”

Section: введение / Introductionmentioning

confidence: 99%

Assessment of influence of duration of the service period on the milk yield of cows

et al. 2023

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“…The gene pool of the Holstein breed, which is considered the best dairy breed in the world, for more than four decades has been widely used and continues to be used to improve domestic livestock, including the black-and-white mottled breed in order to increase plentiful milk yield and improve technological characteristics in industrial production [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of reproductive qualities of cows depending on the productive longevity

et al. 2022

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The Ural type of the domestic black-and-white mottled breed features high productivity rates, good suitability for industrial milking technology, but the duration of its productive longevity is 2.4–2.6 lactations only, although in herds there are cows with productive longevity up to 10 lactations. The decline in productive longevity is associated in particular with reproductive qualities. As a result of the research, it was found that the Sealing Trijun Rockit cows proved to be the most resistant to their long use within the conditions of dairy farms for industrial milk production of pedigree reproducers; their productive longevity was 4.0 lactation. In other lines the productive longevity ranged from 1.8 (Pabst Governor line) to 2.5 (Montvic Chieftain line) lactations. A low fertility rate (less than 0.95) proves the existence of reproduction problems in the herd. Modern Holsteinized black-and-white mottled cattle bred in the Sverdlovsk region has high breeding qualities. The potential of their use is quite high and, despite certain reproduction problems, they are able to produce for a long time in the ecological and forage conditions of their breeding zone.

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Heritability and correlative variability of the conformation linear traits of first-born cows of black-and-white cattle with milk yield

Khmelnychyi,

Karpenko

2023

Tehnologìâ virobnictva ì pererobki produktìv tvarinnictva

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An in-depth analysis the publications of domestic and foreign authors was carried out in the aspect of research on the heritability of linear traits of the conformation type and their correlative variability with milk productivity.The research authors established that the level of existing variability in the heredity of linear traits depends on many genotypic and paratypic factors. However, they argue that despite the variability of traits heritability of dairy cows conformation, their level is generally sufficient for effective selection by linear type traits. Studies on the correlation between linear traits of type and milk productivity of cows of various breeds around the world have shown a high level of this relationship. This testifies about the effectiveness of indirect selection of dairy cattle by type, which will allow obtaining not only constitutionally strong and healthy animals, but also with high milk productivity.The population-genetic aspect of determining the heritability and correlative variability of linear traits with milking of first-born Holstein cows of domestic selection and Ukrainian Black-and-White dairy in the private enterprise "Burynske" of the Podlisniv branch of the Stepaniv territorial community in Sumy district was described. The magnitudes and reliability of the heritability coefficients of group linear traits indicate that they are controlled by the genotype of animals by 24.5-42.2 % in first-born cows of the Holstein breed, and by 26.6-40.1 % in female cows of Ukrainian Black-and-White dairy breed. The final score by type of 48.2 and 45.4 %, respectively, ensures the efficiency selection of cows by genotype. Variability of descriptive traits of Holstein cows ranges from insignificant and unreliable (h2=0.084; location of front teats) to high and reliable (h2=0.484; angularity). In females of the same age of Ukrainian Black-and-White dairy breed, the variability varies from 0.077 (location of rear teats) to 0.422 (angularity).In Holstein and Ukrainian Black-and-White dairy cows, the most reliable relationship was found between the characteristics of the dairy type (0.428 and 0.387), body (0.446 and 0.439), udder (0.486 and 0.478) and, especially, the final type score (0.492 and 0.488), which gives reason to assert about the effectiveness of selection based on these traits.The highest level of reliable positive correlation with the amount of milk yield for the first lactation was found according to the scores of descriptive traits of Holstein and Ukrainian Black-and-White dairy breeds, respectively: height (r=0.363 and 0.322), body depth (r=0.468 and 0.484), angularity (r=0.477 and 0.466), back width (r=0.366 and 0.322), posture of pelvic limbs (r=0.369 and 374), attachment of front (r=0.482 and 0.426) and rear (r=0.371 and 0.351) udder parts, central ligament (r=0.364 and 0.375) and locomotion (r=0.363 and 0.322) at Р<0.001. Key words: Holstein, UkrainianBlack-and-Whitedairy, lineartypeevaluation, conformation, milkyield, first-borncows.

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A comparison of the milk yield and morphometrics of Irtysh type Simmental cows and their Holstein and Simmental crosses in East Kazakhstan

Cited by 3 publications

References 10 publications

Assessment of influence of duration of the service period on the milk yield of cows

Assessment of influence of duration of the service period on the milk yield of cows

Dynamics of reproductive qualities of cows depending on the productive longevity

Heritability and correlative variability of the conformation linear traits of first-born cows of black-and-white cattle with milk yield

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