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• W2063785261 abstract "Abstract In animal breeding programs, selection coupled with a narrow genetic base can cause high levels of inbreeding to occur rapidly (in one or two generations). Although the effects of inbreeding have been studied extensively in terrestrial animals and to a lesser extent in aquaculture species, little is known about the effects of inbreeding on penaeid shrimp. The objective of this study was to investigate the effects of inbreeding on hatchery and growout performance of the Pacific white shrimp, Penaeus vannamei . The experiment was conducted over 2 yr, and data from two successive generations (G 2 and G 3 ) of inbred (sibling–sibling mating) and outbred families were analyzed. There were 11 inbred and 12 outbred families in G 2 and 9 inbred and 10 outbred families in G 3 . Inbreeding coefficients ( F ) for outbred and inbred families were 0.00 and 0.25, respectively, for G 2 and 0.00 and 0.375, respectively, for G 3 . Growth rates for outbreds and inbreds were similar in both G 2 and G 3 . Hatch rate for inbred families was 33.1% lower than for outbred families in G 2 and 47.1% lower in G 3 . Inbreeding depression (IBD) (relative change in phenotype per 0.1 increase in F ) ± 95% CI for hatch rate was −12.3 ± 10.1%. Hatchery survival for inbred families was 31.4% lower than for outbred families in G 2 and 38.8% lower in G 3 . IBD for hatchery survival was −11.0 ± 5.7%. Growout survival was 1.9% lower for inbred families than for outbred families in G 2 and 19.6% lower in G 3 . IBD for growout survival was −3.8 ± 2.9%. There was also a significant linear relationship between IBD estimates for survival traits and mean outbred survival. At high outbred survival, IBD was low (e.g., growout survival in G 2 ), but IBD appeared to become more severe when outbred survival was lower. This suggests that stress (related to environment and/or life stage) may worsen IBD for survival traits. Results also indicate that moderate to high levels of inbreeding (>10%) should be avoided in commercial shrimp hatcheries because the cumulative effect of IBD on hatch rate and hatchery survival will significantly reduce postlarvae production. Thus, IBD can be significant enough to justify the use of inbreeding as a germplasm protection strategy (under certain scenarios) for genetic improvement programs." @default.
• W2063785261 created "2016-06-24" @default.
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• W2063785261 date "2008-07-23" @default.
• W2063785261 modified "2023-10-18" @default.
• W2063785261 title "Inbreeding Effects on Hatchery and Growout Performance of Pacific White Shrimp,<i>Penaeus (Litopenaeus) vannamei</i>" @default.
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• W2063785261 doi "https://doi.org/10.1111/j.1749-7345.2008.00189.x" @default.
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