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Оценили селекционные параметры - наследуемость и селекционные разницы - для популяции свиней из племенных стад белой крупной породы, на основе материалов касающихся одной генерации (около 2 лет). Интенсивность селекции для качества выращенных поросят составляла около 0,2, а коэффициент наследуемости - 0,086. Итак отмеченное в исследованных стадах уменьшение воспроизводительной способности свиноматок не является результатом негативной, непосредственной селекции.
The selection parameters such as heritability and selection differences were estimated for pig population from 15 Large White nucleus herds within one generation (2 years). The intensity of selection for litter size at 21th day of life amounted to about 0.2 and heritability coefficient was - 0.086. Therefore the decrease in reproductive performance of sows observed in tested herds is not the result of negative, direct selection.
Genotype and environment interactions, measured by the genetic correlation between the traits of boars offspring performance estimated in test stations, take place at breeding farms or in commercial herds and may be responsible for lower genetic unprovement of commercial herds. The conditions of efficient selection for lean meat growth rate of modern pig types with regard to genotype x environment interaction were discussed. The interaction between genotype and feeding regime during fattening of genetically differentiated crossbreds strongly affects the fattening traits, carcass value and economic results. The phenomenon of different halothane genes expression, depending on slaughter weight, supports the necessity ol intensification of the research work on phenotypic expression of single major genes under different extemal conditions.
The effectiveness of Prowoks (acidifying preparate) and Microferm-fer (probiotic preparate supplemented with vitamins A, E, B12 and Fe) in the breeding of suckling and weaned piglets was examined. A satisfactory weight gain rate and food utilization were noted in weaned piglets receiving Prowoks (group D-l). In group D-2 in which the probiotic was used, diarrhea persisted for a shorter time and was less intensive compared with piglets from group K and D-1. In this group the percentage of piglet mortality was lower than that in group K and D-1, by 3.0% and 4.37%, respectively. Lower food consumption and better food utilization by piglets receiving lactic acid and the low cost of this preparate significantly decreased food expenses in group D-1. The use of stimulating preparates, probiotics and acidifying improved the effectiveness of young pig production.
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