نتایج جستجو برای: crossbreeding
تعداد نتایج: 8975 فیلتر نتایج به سال:
SUMMARY Domestic animal diversity in developing countries is embedded in traditional farming and pastoral communities who manage their livestock according to their indigenous knowledge (IK) and in tune with local ecological constraints. Especially in marginal environments, local livestock breeds are crucial for sustaining rural livelihoods by producing a wide range of products while requiring r...
Optimum weighting ratios of maternal:direct EBV for litter size using an animal model were examined to achieve maximum genetic improvement (direct plus maternal response). Stochastic simulation of a 120-sow herd over a 10-yr period of selection was used (20 replicates). Directional selection was based on a merit function of maternal and direct EBV for first-parity litter size. Optimum weighting...
This study was conducted to compare the feedlot performance and growth traits of Lori-Bakhtiari (n=39), Romanov × Lori-Bakhtiari (n=38) and Pakistani × Lori-Bakhtiari crossbred (n=12) lambs during two consecutive years. Lambs were weaned at the age of 90 ± 5 days. After weaning and preliminary fattening period, three groups of lambs were fattened for 90 days in the same conditions. The resul...
There are many ways to genetically modify fish including inbreeding, gynogenesis, androgenesis, selection, intraspecific crossbreeding, interspecific hybridization, polyploidy, sex reversal and breeding, nuclear transplantation and transgenesis. Cloned populations have been produced via gynogenesis and androgenesis (Dunham 2004 in press), but direct cloning of an individual fish of interest has...
We investigated the effects of crossbreeding on slaughter traits and the chemical composition of chicken breast muscle. Trials were conducted using 120 broilers from four lines: Xiao-Shan chicken (XS), Xian-Ju chicken (XJ), Xiao-Shan chicken♂ × Xian-Ju chicken♀ (Zhenan 1, ZNY1) and Xiao-Shan chicken♂ × (Guang-Xi Yellow chicken♂×XianJu chicken♀) ♀ (Zhenan 2, ZNY2). The birds were slaughte...
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