Abstract
The aim of the research is to study the influence of different seasons of birth on the productivity of Hereford bulls for the implementation of various technological solutions. The object of the study were Hereford bulls from birth to 16 months of age in LLC «Andrianovsky» of the Republic of Khakassia. By pairing custom-made 100 cows with the bull in 2015-2016 was obtained 53 bull. Of these, 2 groups of 20 bulls were formulated for control cultivation: 1st-animals born from January to April, and 2nd - from October to December. Assessment of the dynamics of live weight of test bulls of both groups shows that the average age of 16 months met the requirements of the elite class. While significant differences between the groups in live weight over the accounting periods was not observed. Bulls of the 1st group had a live weight of 462.9±10.9 kg, the 2nd group-438.6±11.2 kg. the Exception is only the average daily increase from 12 to 16 months. There was a significant superiority of bulls born in the period from January to April (P<0.001). The greatest relative increase was observed in animals of the 1st group aged from birth to 16 months, i. e. for the entire period of cultivation, and bulls of the 2nd group only in the period from 8 to 12 months, when this group, using the potential of pastures, is ahead of the average daily growth of their peers. Season of birth has no significant effect on the ability to achieve Hereford bulls optimal body weight. This proves the possibility of using Hereford animals in the implementation of new promising technological solutions.
Highlights
Assessment of the dynamics of live weight of test bulls of both groups shows that the average age of 16 months met the requirements of the elite class
Bulls of the 1st group had a live weight of 462.9±10.9 kg, the 2nd group-438.6±11.2 kg. the Exception is only the average daily increase from 12 to 16 months
The greatest relative increase was observed in animals of the 1st group aged from birth to 16 months, i. e. for the entire period of cultivation, and bulls of the 2nd group only in the period from 8 to 12 months, when this group, using the potential of pastures, is ahead of the average daily growth of their peers
Summary
Целью исследований является изучение влияния разных сезонов рождения на продуктивность бычков герефордской породы для реализации различных технологических решений. Из них для контрольного выращивания были сформированы 2 группы бычков по 20 голов: 1-я – животные, рожденные с января по апрель, и 2-я – с октября по декабрь. Оценка динамики живой массы подопытных бычков обеих групп показывает, что средние показатели в возрасте 16 месяцев соответствовали требованиям класса элита. Исключение составляет только среднесуточный прирост с 12 до 16 месяцев. Наибольший относительный прирост отмечен у животных 1-й группы в возрасте от рождения до 16 месяцев, т. Е. за весь период выращивания, а у бычков 2-й группы только в период с 8 до 12 месяцев, когда данная группа находилась на пастбищном содержании. Сезон рождения не оказывает достоверного влияния на способность к достижению герефордскими бычками оптимальный живой массы. Это доказывает возможность использования животных герефордской породы в реализации новых перспективных технологических решений
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