Direct and maternal heritabilities and direct-maternal genetic correlations for preweaning calf growth traits were estimated in Japanese Black cattle, so-called Wagyu. Data from 1707 Wagyu calves bom from 1937 to
1991 were collected and edited. (Co)variance components were estimated using REML with an animal model. The traits analyzed were cumulative daily gains from birth to 30, 60, 90, 120, 150 and 180 days and daily gains between given days for body weight, hip height, body length, chest girth, chest depth and thurl width. Heritability estimates were quite variable across traits and also the patterns in change were different. Generally, estimates of both direct and maternal heritabilities for hip height, body length and chest depth were smaller than
ones for the other three traits. Maximum maternal heritabilities for body weight, body length and thurl width
were larger than direct ones. In contrast, for hip height and chest girth direct heritabilities were larger than
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 237–240, 1994
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