By Edward O Price
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Additional info for Animal domestication and behavior
Launey and Hedgecock (2001) crossbred inbred lines of Pacific oysters (Crassostrea gigas) derived from a natural population and compared the segregation ratios of microsatellite DNA markers in F2 or F3 families. e. a high genetic load), which were manifested by inbreeding depression in the inbred lines and restoration of yield and vigor in the hybrids (heterosis). The authors maintain that the Pacific oyster is a particularly good model for understanding the genetic and physiological causes of inbreeding depression and hybrid vigor.
Van Eenennaam et al. (2001) reported the first successful artificial spawning of captive green sturgeon (Acipenser medirostris) by injections of gonadotropin-releasing hormone analog (GnRHa) and domperidone. Medina et al. (1996) demonstrated that female Penaeus kerathurus shrimp can be successfully reared in captivity but fail to reproduce because they do not produce mature oocytes. In contrast, Primavera (1985) reported that some 14 species of marine penaeid shrimp that successfully mature and spawn in captivity have been identified.
1986) reported that drift in two captive populations of fruit flies, Drosophila simulans, reduced the propensity of flies to mate and the number of offspring produced relative to an outcrossed base-line population. , 1991). Lengthening the generation interval (time between birth of individuals and birth of their offspring) will also help to preserve genetic diversity. The longevity of animals living in captivity (Conway, 1978) allows animal breeders to preserve genetic variability in this manner.
Animal domestication and behavior by Edward O Price