J. Anim Sci.
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J. Anim Sci. 1982. 55:771-779.
© 1982 American Society of Animal Science
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Interaction of Sire x Length of Testing Period and Estimation of Genetic Parameters for Performance Testing Traits of Japanese Black Bulls

Y. Sasaki, H. Iwaisaki, T. Masuno1 and S. Asoh2

Kyoto University, Kyoto-shi 606, Japan

Abstract

Performance testing records on 1,409 Japanese Black bulls by 127 sires, obtained from 1971 through 1973, when the testing period was 140 d, and from 1974 through 1977, when the period was 112 d, were used to investigate the importance of the sire x testing period interaction and to estimate the genetic parameters for 10 performance traits. Station effects were highly significant for all traits, but it is likely that the variation among stations included genetic differences. Testing period effects and station x testing period interaction effects were also generally significant. However, the sire x length of testing period within station interaction was not significant for any performance traits studied. Sire within station effects were significant for all performance traits. Heritability estimates for average daily gain, concentrate intake, roughage intake, rate of roughage intake, digestible crude protein (DCP) conversion ratio, TDN conversion ratio, final weight, final withers height, final grade and final performance score were .12 ± .06, .32 ± .08, .39 ± .09, .46 ± .09, .28 ± .08, .24 ± .08, .20 ± .07, .35 ± .08, .15 ± .07 and .11 ± .06, respectively. Estimates of genetic and phenotypic correlations among growth traits, feed intake traits and feed conversion traits agreed fairly well with those estimated previously for some British breeds. The genetic correlation between concentrate intake and roughage intake was negative and sizable. Rate of roughage intake and rate and efficiency of gain were essentially independent genetically. In conclusion, the results support the shortening of the testing period from 140 to 112 d for Japanese Black bulls.

Footnotes

1 Present address: Tokushima Prefectural Meat Anim. Exp. Sta., Anan-shi 744, Japan.

2 Present address: Hisamitsu Pharmacy, LTD, Tosushi 841, Japan.




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