By Edward O Price
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Additional resources for Animal domestication and behavior
G. pelage coloration). The advent of stable agrarian societies and the ability to provide food for captive herbivores set the stage for these important domestications. , 2000). Almost all fish reared in captivity exhibit some form of reproductive dysfunction (Zohar and Mylonas, 2001). The most commonly observed reproductive dysfunctions in cultured fish are the unpredictability of final oocyte maturation in females and the diminished volume and quality of sperm in males (Mylonas and Zohar, 2001).
Alternative alleles are lost) by genetic drift in effectively small populations. , 2000). , 1992). When mating is random, some families will inevitably be represented less than others or lost, resulting in increased inbreeding in the poorly represented families and reduced genetic variation. Severe inbreeding and inbreeding depression are less likely for the population as a whole with equal family representation in each generation. g. body conformation, trainability). Through systematic inbreeding, one can attain a degree of homogeneity and constancy of characteristics that is normally not seen in wild populations.
Aspi (2000) found that courtship singing in inbred Drosophila montana males after 20 generations of brother–sister matings was 14% less frequent than for outbred males. Male courtship song frequency is closely associated with male mating success and offspring survival. , 1998). Miller and Hedrick (1993) created 18 experimental lines of Drosophila melanogaster derived from wild stock which were homozygous for chromosome 2. ) The homozygous flies in six lines which exhibited reduced fitness were allowed to compete with heterozygous subjects for females for 2 h as a measure of male mating success.
Animal domestication and behavior by Edward O Price