Reasons for the disposal of cows, depending on the origin

Abstract

Abstract. Purpose. Study of the reasons for culling cows from the herd depending on belonging to Holstein lines. Methods. Materials of breeding and zootechnical accounting of the Selex database and breeding cards of cows were used for research. Results. The farm breeds animals that belong to the following genealogical lines: Vis Back Idial 1013485, Reflection Sovering 198998, Montwick Chieftain 95679, Pabst Governor 882933 and Annas Adema 30587. The cull was 92 heads or 14.3 %, including lines: 21, 33, 25, 6, 7 heads or 10,0; 18.9; 12.3; 15.8; 41.2 % accordingly. Analysis of the reasons for culling by groups of cows of different lines showed that among the culled cows of the Vis Back Idial line 1013485 there were more than in other groups with pathology of the musculoskeletal system – 37.5 %; the Reflection Sovering line 198998 – accidents and injuries – 34.6 %; in the group of cows of the Montwick Chieftain line 95679, a significant number of cases of breast pathology – 27.2 % and in general, the main reasons for culling on the farm are injuries and surgical diseases – 33.7 %; pathology of the breast – 21.7 % and pathology of the reproductive system and barrenness – on 16.3 %. Despite the fact that the farm has created quite good conditions for ensuring the normal life of cows, including a balanced feeding diet, which is indicated by a low percentage of culls associated with metabolic pathology, cases of poisoning were detected – 8.7 %. Existing violations of the content are confirmed by a significant number of injuries, accidents, and limb diseases. The scientific novelty of the work lies in the fact that the influence of origin (belonging to the line) on the level of culling of breeding stock for one reason or another has been proved, which allows through breeding work to have a positive impact on increasing the duration of productive use.

Relationship between blood biochemical parameters and beef quality indicators in Hereford bulls

“…The identification of reliable tools for predicting the main indicators of beef cattle productivity has been a key point of numerous studies. Most studies agree that lifetime parameters of animal phenotype and external traits are the most available markers of beef quantity and quality [9][10][11]. In our studies, the biochemical composition of blood and hormonal status of Hereford bulls were studied to develop an integrated approach to predicting the biological value of meat and metabolic peculiarities.…”

The quality of milk of cows-daughters of different bulls-producers and assessment of its suitability for processing

“…Черно-пестрая порода несколько десятилетий совершенствовалась за счет скрещивания с лучшим мировым генофондом молочного скота -голштинской породой [8,9]. Это позволило получить большой массив животных с высокой долей кровности по голштинской породе в разных эколого-кормовых и природно-климатических зонах страны, которые отличаются по хозяйственно полезным признакам, что обеспечивается породными ресурсами разных зон разведения [10][11][12][13][14][15].…”

The effectiveness of growing repair heifers-daughters of different servicing bulls

“…In addition, beef is obtained from cattle, meat that is in high demand among the population of the country. Dairy cattle of black-and-white, Holstein and other breeds are mainly used for this purpose [1][2][3]. Until 2021, the main livestock of dairy cattle was represented by black-and-white breed animals, which were improved for a long time using the global gene pool of Holstein bulls.…”