本文選題：內(nèi)蒙古絨山羊　切入點：近交　出處：《內(nèi)蒙古農(nóng)業(yè)大學》2015年碩士論文　論文類型：學位論文

【摘要】：本研究旨在估計內(nèi)蒙古絨山羊種羊場羊群近交水平及近交對其重要經(jīng)濟性狀的影響。試驗數(shù)據(jù)全部采集于內(nèi)蒙古絨山羊種羊場23年(1990-2012)的系譜和生產(chǎn)性能記錄。研究性狀包括產(chǎn)絨量、絨長度、絨細度、妊娠期、產(chǎn)羔數(shù)、出生重、斷奶重、周歲重和成年重。試驗運用了兩個不同的模型(包含和不包含近交系數(shù))來調(diào)查近交對表型值、遺傳參數(shù)和估計育種值的影響。結(jié)果表明,全群平均近交系數(shù)為4.01%(0-35.94%),年平均增長率為0.32%。產(chǎn)絨量和絨長度在低水平近交時隨著近交增大而增大,但當近交系數(shù)分別高于12.5%和4.4%后二者開始下降。然而絨細度卻隨著近交的增大越來越細。妊娠期和產(chǎn)羔數(shù)不受近交影響。對于出生重和成年重,二次與一次效應均顯著,回歸系數(shù)分別為0.0003與-0.0021和0.0116與-0.1557。研究還發(fā)現(xiàn)隨著近交系數(shù)每增加1%,斷奶重和周歲重分別顯著降低0.0231kg和0.0353kg。此外,對所有性狀而言遺傳參數(shù)和育種值的估計并不會因為模型中引入近交而發(fā)生改變。
[Abstract]:The purpose of this study was to estimate the level of sheep inbreeding in Inner Mongolia Cashmere Goat Farm and the influence of inbreeding on its important economic characters. All the data were collected from the pedigree and production performance record of Inner Mongolia Cashmere Goat Farm for 23 years (1990-2012). The traits include cashmere yield, Velvet length, velvet fineness, pregnancy, lambs, birth weight, weaning weight, annual weight and adult weight. Two different models (including and without inbreeding lines) were used to investigate the phenotypic values of inbreeding pairs. The results showed that the average inbreeding coefficient of the whole population was 4.01 ~ 35.94, and the annual average growth rate was 0.32. The yield and length of cashmere increased with the increase of inbreeding at low level. However, when the number of inbred lines was higher than 12.5% and 4.4%, respectively, both of them began to decrease. However, the velvet fineness increased with the increase of inbreeding. The pregnancy and lambs were not affected by inbreeding. For birth weight and adult weight, the secondary and primary effects were significant. The regression coefficients were 0.0003 and -0.0021 and 0.0116 and -0.1557 respectively. It was found that the weaning weight and annual weight decreased by 0.0231 kg and 0.0353 kg respectively with the increase of inbred lines. For all traits, the estimation of genetic parameters and breeding values will not change due to the introduction of inbreeding in the model.
【學位授予單位】：內(nèi)蒙古農(nóng)業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：S827

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相關期刊論文 前1條

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本文編號：1628548