放牧肉牛の増体量の品種比較

概要

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The present study was performed to analyse the data from five years' experiments of Aberdeen Angus, Japanese Black, Holstein Friesian, Polled Hereford and Japanese Shorthorn, which had grazed continuously from June to November on improved, native and native plus improved pastures without any concentrates. The average body weight gain on grazing varies with pastures and breeds and a clearer ranking was observed on native pasture than on improved pasture. 1) On improved pasture, Polled Hereford, Japanese Shorthorn and Holstein Friesian breeds gain more live weight as compared with Japanese Black and the difference was significant at the 1 percent level. 2) On native pasture, Polled Hereford, Japanese Shorthorn and Aberdeen Angus showed considerably poorer gains than when on improved pasture, and the difference between breeds was not significant. 3) On improved plus native pasture, the gains for all breeds were about midway between the gains on improved and on native pasture. The difference between the breeds was significant at the 5 percent level. 4) Hook order was recognized in native pasture group, but there was no evident effect of hook order on average daily gain. 5) Variance component analysis was applied for the estimation of the effect of breeds on average daily gain. 6) In this experiment, it was demonstrated that greater live weight gain on passture was obtained by selected breeds on pasture adapted for these breeds.