摘要:
本研究以莆田黑鸭为素材,建立各不同近交程度的近交系群,测定其300日龄蛋用性能,结果表明:12.5% 近交程度对各经济性状影响较小,近交程度每增加10%,开产日龄、300日龄产蛋数、蛋重三个性状平均衰退率分别为18.3% 、14.2% 和2.0%.本试验的21.9% 的近交程度时各性状表现严重的近交衰退.经选择性能优秀的近交系群与世代选育系M和W杂交,F1代生产性能表现良好的杂种优势,上述三个性状的杂种优势率分别为-6.83% 、15.26% 和4.75%,且W系杂交效果优于M系.顶交和底交产生的杂交效果不同,其300日龄产蛋数性状杂种优势率分别为3.84% 和17.49%,底交效果优于顶交.本文探讨了近交系群应用于配套育种的可行性.
Abstract:
In this research,the inbred lines of different inbreeding levels were established by usingthe source of Putian Black Duck. The egg-laying performance by duck at the age of 300 days wasdetermined and the result showed that 12.5% inbreeding levels had less influence on economiccharacters.When the inbreeding levels increased by 10% each time,the average depression rates ofthe three kinds of characters,i.e. the initial laying age,egg number and egg weight at 300 day agewere 18.3%, 14.2% and 2.0% respectively. In this experiment,when the inbreeding level was21.9%, the characters showed serious inbreeding depression. The selected inbred line with excel-lent performance was crossed with generation-selecting line W and M and the progeny F1 showedgood hybrid superiority. The rates of above-mentioned superiority of the three kinds of characterswere-6.83%,15.26% and 4.75% respectively and the crossing effects of W line was better thanthat of M line. The crossing effects produced by top cross and bottom cross were different. Thesuperiority rates of the egg number at 300 day age were 3.84% and 17.49% respectively. The ef-fect of bottom cross was better than that of top cross. The feasibility of applying the inbred line tobreeding combination was approached in this paper.
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