. Ciba Foundation colloquia on ageing. Old age; Aging; Animals -- growth & development. 40 A. Comfort roughly X 3-2. The last part of the curve calculated from q^ values at ages of 25 and over is, of course, largely arbitrary, and in the late intervals losses, many of them from age- dependent causes, equal or exceed deaths. The survival curves and expectations of the separate cohorts are roughly similar, but there is substantial scatter (Table II), lOOi- SURVIVAL CURVES OF THOROUGHBRED MARES -GENERAL STUD-BOOK. AGE IN YEARS Fig. 1. Survival curves of mares foaled in 1860-64 (- -), in 1875-
. Ciba Foundation colloquia on ageing. Old age; Aging; Animals -- growth & development. 40 A. Comfort roughly X 3-2. The last part of the curve calculated from q^ values at ages of 25 and over is, of course, largely arbitrary, and in the late intervals losses, many of them from age- dependent causes, equal or exceed deaths. The survival curves and expectations of the separate cohorts are roughly similar, but there is substantial scatter (Table II), lOOi- SURVIVAL CURVES OF THOROUGHBRED MARES -GENERAL STUD-BOOK. AGE IN YEARS Fig. 1. Survival curves of mares foaled in 1860-64 (- -), in 1875-80 ( ), of brood mares by three selected long-lived stallions (Hampton, Galopin and Hermit) ( ), and of grey mares ( ). the last three years of the 1875-80 sample having a shorter expectation of life than any of the others (0-05 < P < 0-02 for the largest difference). The proportion of scoreable lives to total fillies foaled is rather higher in sample B (33-0 against 26-8 per cent) but there is no immediately obvious reason for the differences in cohort performance. There may be bias in sampling, since the two lowest-scoring cohorts of sample A contain an unusually low proportion of late entrants to the record. Mares are normally entered when first covered, but animals among the unaccounted majority which have not. 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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