Application of the Desired Type Concept in Herd of Jersey Breed

Kochuk-Yashchenko, O.; Кучер, Д. М.

doi:10.31073/abg.59.05

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“…Вірогідність різниці між дослідними групами тварин залежно від величини індексу адаптації наведена у таблиці 2. Перевага за рівнем надоїв тварин з середнім значенням індексу адаптації пояснюється наявністю у цій групі корів, що поєднують досить високою молочну продуктивність із задовільним відтворенням [6,16]. Індекс адаптації в середньому по нашій вибірці склав -4,75 ± 0,54 при бажаних параметрах від -6 до +6 [8].…”

Section: показники молочної продуктивності та відтворної здатності коunclassified

“…Статистично значущого впливу належності до ліній та до потомства конкретних плідників на ознаки відтворення корів в цілому не спостерігалось (P > 0,05). Нами встановлено, що на відтворювальні якості корів більший вплив спричиняє рівень надоїв корів за лактацію (23,1%, при P < 0,001), що підтверджено раніше проведеними нами дослідженнями [6].…”

Section: вплив належності до лінії походження за батьком та рівня прunclassified

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The Assessment of the Adaptability of Jersey Breed Cows

Pelekhaty

Кучер

Kochuk-Yashchenko

et al. 2020

Anim. Breed. and Genet.

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The results of the studies carried out highlight the assessment of the adaptive ability of Jersey cows. The conditions of keeping Jersey cows in the Dan Milk subsidiary contribute to the realization of high milk productivity, which is due to heredity, but cause a deterioration in their reproductive capacity. At the same time, a high manifestation of milk productivity and satisfactory reproductive ability have observed only in the daughters of DJ Jante 302761 – whose adaptation index was closer to zero and amounted to -2.7. The force of influence (ηx2) of paternal origin on the signs of milk production in first-calf calfs was 21.1% versus 5.9% of the generalized mean value for cows belonging to the line. It has been founded that according to the adaptation index, the state of animals those characterized by the absence of harmonious interaction with the environment – cows show high productivity with a significant deterioration in reproductive capacity, which indicates the presence of a feedback between these characteristics. It was found not high enough, but statistically significant influence (P < 0.01 – P < 0.001) on the adaptation level of first-calf cows by milk yield for 305 days of lactation (8.0%), milk fat and protein (7.0%). A statistically significant effect (ηx2 = 82%) of the signs of reproductive ability of cows (service period and period between calving) was found depending on their level of adaptation (P < 0.001). With an increase in the level of milk production of cows, was established a clear connection between the deterioration of the adaptive qualities of livestock. So with an increase in milk yield for the entire lactation from 6000 to 10000 kg of milk, the adaptation index decreases from -0.5 to -9.5, which is confirmed by a statistically significant difference between the extreme groups of animals with different levels of productivity (P < 0.001). According to the adaptation index, the condition of animals were characterize by the lack of harmonious interaction with the environment - cows show high milk productivity with a significant deterioration in reproductive capacity, which indicates the inverse relationship between these traits. The influence of the father and belonging to the lines on such indicators of milk productivity as: yield for 305 days of lactation, milk fat and protein (P < 0.05 – P < 0.001) was statistically significant. Significant effect of increasing the level of milk yield of cows was observed on such signs of reproductive capacity as: service period, period between calves and reproductive ability coefficient (P < 0,001). There was no statistically significant effect of belonging to the lines and offspring of specific breeders on the signs of reproduction of cows in general (P > 0.05). We found that the reproductive quality of cows is more influenced by the level of milk yield of cows during lactation (23.1%, at P < 0.001), which is confirmed by our previous studies. The conditions of keeping Jersey cows in the Dan Milk State Enterprise contribute to the realization of high milk productivity, which is due to heredity, but causes a deterioration in their reproductive capacity.

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Section: показники молочної продуктивності та відтворної здатності коunclassified

Section: вплив належності до лінії походження за батьком та рівня прunclassified

The Assessment of the Adaptability of Jersey Breed Cows

Pelekhaty

Кучер

Kochuk-Yashchenko

et al. 2020

Anim. Breed. and Genet.

Self Cite

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The Effect of the Type of Body Build of Cows on Their Milk Output and Milk Quality

Admin

Admina

Помитун

et al. 2023

STBIAS

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The presented article gives the results of evaluation of the body build type of firstling cows of Ukrainian black and white dairy breed, there are determined the influence of linear features of body build and udder on their milk output and quality and also the relations between these indicators in the form of regression equations. It was revealed that the average daily milk output of cows had a probable correlation influence with height, body depth, width of loin, rear udder attachment, central ligament, udder depth. Average milk fat content had a probable correlation with rear udder attachment and central ligament, while average protein content had a probable correlation with their height, chest width, body depth, butt width and front udder attachment, indicating a weak positive correlation between these parameters. A probable correlation between the average somatic cell content and the linear estimate of body type indicators was found only with the estimate of udder depth, central udder ligament and posterior dugs position. In the course of the research it was revealed that the average daily milk output of firstlings was likely influenced by the following attributes of linear estimation of the type of body build: height, breast width, angularity, butt width, posterior attachment of udder, udder depth, central ligament and posterior dugs location. By the results of the researches the regression model of prognostication of the average daily milk output of the firstling cows by the values of the linear estimation of the body build type of the cows is developed, that will allow making the decision on expediency of their further utilization in the second month of lactation. The proved models for predicting fat and protein content percentages in milk should be used for evaluation of firstling cows as auxiliary ones. There were created the models for prediction of number of mastitis cases in firstlings and content of somatic cells in milk on the basis of values of indicators of linear estimation of body type of cows. Keywords: dairy cows, body build, linear estimate, daily output, fat and protein content percentages, somatic cells, regression model.

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Application of the Desired Type Concept in Herd of Jersey Breed

Cited by 2 publications

References 0 publications

The Assessment of the Adaptability of Jersey Breed Cows

The Assessment of the Adaptability of Jersey Breed Cows

The Effect of the Type of Body Build of Cows on Their Milk Output and Milk Quality

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