. The biology of senescence. Old age; Aging; Longevity. The Biology of Senescence increasing early output of eggs or offspring. Greenwood (1932) found that the fertility and hatchability of hens' eggs decline with age of the parent to such an extent that attempts to improve the stock by breeding from long-lived birds were economically impracticable. Apart from the obvious difficulty. Fig. 32.—Drosophila subobscura. Strain K. Survival curves of flies raised in each generation from eggs laid by adults which had passed the thirtieth day of imaginal life. Compare Fig. 33. of breeding for long life
. The biology of senescence. Old age; Aging; Longevity. The Biology of Senescence increasing early output of eggs or offspring. Greenwood (1932) found that the fertility and hatchability of hens' eggs decline with age of the parent to such an extent that attempts to improve the stock by breeding from long-lived birds were economically impracticable. Apart from the obvious difficulty. Fig. 32.—Drosophila subobscura. Strain K. Survival curves of flies raised in each generation from eggs laid by adults which had passed the thirtieth day of imaginal life. Compare Fig. 33. of breeding for long life in any animal with a substantial post-reproductive period, which involves rearing all the progeny of large numbers of animals throughout life, the consequence of inbreeding per se, and the tendency of inbred laboratory stocks to reach a very stable equilibrium life-span (Pearl and Parker, 1922) militate against any such experiment. In Pearl's own experiments (Pearl, 1928) the long- and short-lived 124. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Comfort, Alex, 1920-. New York, Rinehart
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Keywords: ., bookcentury1900, booksub, booksubjectlongevity, booksubjectoldage
