A farmed population of rainbow trout under selection for over six generations from the Norwegian Salmon Breeding Company, Ltd. was investigated for levels of inbreeding and occurrence of inbreeding depression for body weight. The average percent inbreeding levels and percent of individuals with inbreeding greater than zero (in parenthesis) were 2.9 (59.3), 2.8 (49.8), 8.5 (87.1), 8.0 (82.8) and 6.6 (81.4) for generations 2, 3, 4, 5 and 6, respectively. The coefficients of inbreeding ranged from zero to 30%. The rate of increase in inbreeding coefficient was non-linear. The average increase in inbreeding was 1.3% per generation. The inbreeding depressions for body weight at harvest per generation were: -1.2%, -0.3%, +0.03%, -0.2% and +0.1% per 1% unit increase in inbreeding coefficient. Over all generations, inbreeding depression was -0.2% per 1% inbreeding. These results suggest there is no cause for concern over the current inbreeding trend and inbreeding depression for this population.

M. JR Pante, Bjarne Gjerde, I. McMillan

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 27: Reproduction; fish breeding; genetics and the environment; genetics in agricultural systems; disease resistance; animal welf, , 119–122, 1998
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