Longitudinal somatometrical study on the growth patterns of newborn Japanese monkeys |
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Authors: | Yuzuru Hamada |
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Institution: | (1) Primate Research Institute, Kyoto University, 484 Inuyama, Aichi, Japan |
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Abstract: | Growth of Japanese macaques during their first year was analyzed longitudinally, using body measurements. Measurements of
44 somatometrical characters were taken on seven animals. Work with the newborn data produced a formula which fits well. The
formula is: y=a (x+b)
n
(y=size, x=age). At first, growth was analyzed, character by character, using birth sizes and incremental increases. The
results show a major growth pattern for many characters: increments vary inversely with birth size. Application of the growth
formula produced two further insights: (1) growth pattern is not so simple as imagined from the birth size-increment pattern;
and (2) the characters which deviate from the birth size-increment pattern have large growth only at the earliest period (in
few months), in spite of their small size. Sex differences were clear within the first year, especially for characters which
differ greatly between adults. |
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Keywords: | |
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