Sexual dimorphism of Japanese wild boars in Chugoku Mountains.

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  • KANZAKI Nobuo
    <I>Laboratory of Nature Conservation, Faculty of Agriculture, Tokyo Noko University</I>

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  • Sexual dimorphism of Japanese wild boar

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A total of 285 Japanese wild boars without viscera were weighed and measured for head and body length, shoulder height, and girth. The growth of females reached asymptotes at 3.5 years of age of 50 kg for body mass, 125 cm in head and body length, 70 cm in shoulder height and 95 cm in girth. On the other hand, growth of males did not reach asymptote at least up to 4.5 years of age of 95 kg for body mass, 145 cm in head and body length, 77 cm in shoulder height, and 118 cm in girth. Growth for males was expected to decline first in head and body length, next in shoulder height, third in girth, and finally in body mass. Growth of all measurements for females reached asymptotes at a similar age. Males exceeded females in all the measurements. Sexual differences increased linearly with advancing age from 0.5 to 4.5 years of age and became bigger in order of shoulder height, head and body length, girth, and body mass. Comparing with other two populations, sexual dimorphism of Chugoku population was the biggest.

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