緬羊の産毛量に関する研究 (第3報)産毛量とその他のフリース形質との関係

In the present study 359 Corriedale sheep(male 25 and female 334) born in 1956 at the Iwate Stock Breeding Farm and the Takikawa Stock Breeding Farm were used as experimental animals, and their wool yields(raw wool yield, clean wool yield and clean yield percentage) per animal per year and the other fleece characters(staple length, wool fineness and wool density) of wool sample were determined and the relation between the wool yield and the other fleece characters of sheep, classified by the stock breeding farm, sex and age, were investigated, calculating the correlation and regression coefficients of the wool yields on the other fleece characters. The results obtained from the experiments were as follows: 1)Though a few significant correlations were found respectively between the staple length of wool sample and the raw wool yield(r=0.28 and 0.29), and clean wool yield(r=0.34～0.54), and clean yield percentage(r=0.42 and 0.58) of entire fleece of Corriedale sheep, it was found that those correlations were not high. 2)In general there was a trend that the correlations beetween the staple length of wool sample and the clean wool yield of whole fleece were higher than those between the staple length of wool sample and the raw wool yield of whole fleece. 3)A few significantly high correlations were observed between the wool fineness of wool sample and the raw wool yield(r=0.37～0.82) and clean wool yield(r=0.34～0.80), and clean yield percentage(r=0.28 and 0.34) of whole fleece, but on the whole those correlations were found to be low and in particular the correlations between the wool fineness and the clean yield percentage found to be insignificant and low. 4)Significant correlations between the wool density of wool sample and the raw wool yield(r=0.27), and clean wool yield(r=0.32), and clean yield percentage(r=0.38) of entire fleece were only found on female sheep of three years of age and the low correlations, either positive or negative, were found on female sheep of the other years of age. 5)No variations of a definite trend, increasing or decreasing, with advance in age were found on the correlations of the staple length, wool fineness and wool density to the other fleece characters(raw wool yield, clean wool yield and clean yield percentage) respectively.