Heterosis among lines of mice selected for body weight |
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Authors: | C K Bhuvanakumar C B Lynch R C Roberts W G Hill |
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Institution: | (1) Institute of Animal Genetics, University of Edinburgh, West Mains Road, EH9 3JN Edinburgh, Scotland;(2) Present address: Sheep Breeding Research Station, Tamil Nadu Agricultural University, 643 237 Sandynallah, India;(3) Present address: Department of Biology, Wesleyan University, 06457 Middletown, CT, USA;(4) Present address: Fisheries and Food, Great Westminster House, Ministry of Agriculture, Horseferry Road, SW1P 2AE London, England |
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Abstract: | Summary To examine the effect of selection on levels of heterosis, crosses were made between three groups of six lines of mice, one group unselected (controls) and the other two selected for high (large lines) and low (small lines) 6-week body weight, respectively. The coefficient of inbreeding of each line was about 0.60. Each line was crossed reciprocally to one line from each of the parental groups, as well as producing purebred progeny. Heterosis for 3-week weight, 6-week weight and 3–6 week gain averaged 0.0%, 2.4% and 4.2%, respectively, and was higher for males than for females. Heterosis was more extensive in crosses involving large or control lines than in crosses with small lines. There was no detectable heterosis in several measures of developmental rate, such as age at vaginal opening. Food conversion efficiency and carcass composition were measured on a sample of the animals. Food consumption, gonadal fat pad weight, and hindquarters weight, each expressed as a proportion of body weight, exhibited –4.0%, 5.6%, and 2.3% heterosis, respectively. |
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Keywords: | Heterosis Mice Selection Growth |
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