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Diallel cross among lines of mice selected for litter size and body weight body composition traits



Diallel cross among lines of mice selected for litter size and body weight body composition traits



Zeitschrift fuer Tierzuechtung und Zuechtungsbiologie 102(1): 10-22



A diallel design was used to estimate genetic effects on body composition in 5 lines of mice and reciprocal F1 crosses. The 5 lines were L+, selected for large litter size at birth; W+, selected for large 6-wk body weight; L+W-, selected for large litter size and small 6-wk body weight; L-W+, selected for small litter size and large 6-wk body weight; and K, selected randomly. Percentages of fat, protein and ash were estimated in 6-wk-old males by near-infrared reflectance spectrophotometry (NIR). Fat percent was also predicted by a multiple regression equation (EW) based on body water percent and epididymal fat pad weight as a percent of empty body weight. Ranking of crosses was the same for NIR and EW fat percent estimates (r = 0.92, P < 0.01), but considerable change in rank was detected among individuals within crosses (r = 0.70, P < 0.01). Average direct genetic differences among lines in body composition were larger than average maternal genetic differences. Correlated responses were largest for fat percent, but even these were relatively small. Small negative correlated responses in fat percent, attributed primarily to average direct genetic effects, were found in each selected line. Lines L-W+ and L+W- had negative correlated responses in protein percent, while W+ and L- showed no change. No correlated responses in ash percent were detected. Magnitude of direct heterosis for fat and protein percent varied among crosses. Heterosis for fat percent generally was in an unfavorable direction. Heterosis for protein percent was smaller than for fat percent without an indication of positive or negative trend, whereas heterosis for ash percent was negligible.

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Accession: 005145558

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DOI: 10.1111/j.1439-0388.1985.tb00666.x


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