. Ciba Foundation colloquia on ageing. Old age; Aging; Animals -- growth & development. 44 A. Comfort these fell in the same grouping interval. Of 1,492 lives, 1,342 were scored and grouped by age of dam, 1,355 by age of sire, and 719 by both, the missing lives among these being scored for one parent only—chiefly the progeny of imported horses, of stallions whose dates of birth were not easily ascertainable from the record, or of mares covered by more than one stallion in the season. The distribution of parental ages is shown in Fig. 2, and the results of the calculation in Table III. DIST
. Ciba Foundation colloquia on ageing. Old age; Aging; Animals -- growth & development. 44 A. Comfort these fell in the same grouping interval. Of 1,492 lives, 1,342 were scored and grouped by age of dam, 1,355 by age of sire, and 719 by both, the missing lives among these being scored for one parent only—chiefly the progeny of imported horses, of stallions whose dates of birth were not easily ascertainable from the record, or of mares covered by more than one stallion in the season. The distribution of parental ages is shown in Fig. 2, and the results of the calculation in Table III. DISTRIBUTION OF PARENTAL AGES THOROUGHBRED MARES 1875-1880 DAM •. SIRE O AGE:YRS 2 Fig. 2. Mares foaled in 1875-80: distribution of ages of sires at covering (O) and dams at foaling (O) (Comfort, 1958a). Reproduced by courtesy of the Editor, Journal of Gerontology. There was no significant difference in expectation of life between foals of mares under and over 13 years of age ( ^ 12, e^^^ = 16-89; ^ 13, e^^^ = 16-86 years). With further sub- division the progeny of the oldest mares had the shortest lifespans, but the largest difference was less than twice its standard error. Still smaller differences were obtained for the same lives grouped by paternal age alone. Of the 719 lives grouped by age of both parents, those whose dam and sire. 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 Ciba Foundation; Wolstenholme, G. E. W. (Gordon Ethelbert Ward). Boston, Little, Brown
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Keywords: ., bookcentury1900, bookpublish, booksubjectaging, booksubjectoldage
