Stud bull plays an important role in the development of animal husbandry. Detailed knowledge about maintenance behavior of stud bulls is essential for practicing better management conditions in the farm to support the artificial insemination (AI) industry demand. Therefore, a comparative study was conducted on stud bulls to evaluate the effect of genetic group, season, genetic group × season in...

Holstein bulls were assigned to sampling categories (AI stud, AI nonstud, or non-AI) based on bull code, controller number, and age at semen distribution. The AI stud bulls were sampled through traditional progeny-testing programs of 13 AI organizations; AI nonstud bulls had AI semen collection reported by another organization or by multiple organizations. The non-AI bulls had no reported AI se...

Purebred stud bulls of a related Holstein breed are widely used when breeding domestic black-and-white cattle breeds. Results’ evaluation using these by offspring quality is relevant and has practical significance. Stud the Vis Back Ideal 1013415 line were evaluated in one farms Moscow region. As result, it was found that all had high value. Bulls Trubach 174 - A 1 ; Nog Odin-M 490626 Lowlands-...

The study results of Aberdeen-Angus breed bull meat production, depending on the body type, are presented. first group consisted bulls descended from stud large tall second small compact type. It was determined that at age 18 months, large-type parents reached a weight 442 kg, and small-type - 413 kg. had higher pre-slaughter by 31.4 kg heavy carcasses compared to 28.3 or 13.5% (P > 0.99). b...

The objectives of this research were to assess the utility of multiple services, rather than first service only, and an expanded service sire term for prediction of bull conception rate (CR) by artificial insemination in the United States. The intent with the expanded service sire term was to determine whether accuracy could be improved by estimating factors affecting the bull's CR explicitly i...