Abstract
Relevance. Pig breeding is primarily aimed at improving their reproductive and fattening qualities. To a lesser extent, the selection takes into account the indicators of the immune status of animals and their resistance to conditionally pathogenic microflora, apparently because due to the significant variability of individual blood parameters in ontogenesis, work with animals of many generations is required to improve these signs by breeding. The urgent task is to accelerate this process.Methods. 6 groups of animals were formed, including: 2 groups of 20 young sows of the Durock breed and large white breed and 2 groups of piglets, their offspring; 10 piglets from each group were weighed monthly, their linear measurements were determined. The study of natural resistance was carried out according to the following indicators: lysozyme, bactericidal and complementary activity of blood serum were measuredby conventional methods and in the author’s modification, hemagglutination reactionand bacterial agglutination — by conventional methods, indicators of phagocytosis were determined by conventional methods and in the author's modification.Results. A new method of comprehensive assessment of the level of natural resistance of pigs based on eight blood parameters — the resistance index (IR) — has been developed. For the first time, two coefficients — repeatability (rw) and persistence (h2) — were used as the statistical weight of traits. It was found that the live weight gain was higher in the offspring obtained from sows with an IR > 60 points. The offspring of highly resistant sows also had an advantage in linear torso measurements.
Highlights
A new method of comprehensive assessment of the level of natural resistance of pigs based on eight blood parameters — the resistance index (IR) — has been developed
It was found that the live weight gain was higher in the offspring obtained from sows with an IR > 60 points
Полученные значения коэффициентов наследуемости и повторяемости были использованы при вычислении индивидуального индекса резистентности каждого животного опытных групп
Summary
В меньшей степени в селекции учитываются показатели иммунного статуса животных и их резистентность к условно-патогенной микрофлоре, по-видимому потому, что из-за значительной вариабельности отдельных показателей крови в онтогенезе для улучшения этих признаков селекционным путем требуется работа с животными многих поколений. Сформированы 6 групп животных, в том числе: 2 группы по 20 основных свиноматок породы дюрок (Д) и крупной белой породы (КБ) и 2 группы поросят, их потомков; по 10 подсвинков из каждой группы ежемесячно взвешивались, определяли их линейные промеры. Исследование естественной резистентности было проведено по следующим показателям: лизоцимная, бактерицидная и комплементарная активность сыворотки крови измерялисьобщепринятыми методами и в авторской модификации, реакции гемагглютинации и бактериальной агглютинации — общепринятыми методами, показатели фагоцитоза определяли общепринятыми методами и в авторской модификации. Разработан новый способ комплексной оценки уровня естественной резистентности свиней по восьми показателям крови — индекс резистентности (IR). Установлено, что приросты живой массы были выше у потомства, полученного от свиноматок с IR > 60 баллов. Agrarian Science. 2021; 351 (7-8): 19–23. (In Russ.)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
