コリデール種仔緬羊における尾毛と羊毛タイプとの関係について 第2報 仔緬羊の尾毛織度について

This study has been carried out to measure the degree of the wool fineness and its coefficient of variation on the tail and to investigate the correlation between the former and the latter on the docked tails of 50 Corriedale sheep lambs born in the spring of 1953. Samples which may be considered as offering the materials for predicting the wool fineness and its variation on the whole fleece of adult sheep, were collected from various districts of Okayama Prefecture. The comparison of the classifications of the wool fineness and its variation by the measured values with those made by observations with naked eyes was made; and these classifications were compared to see if they would agree with each other. The results obtained were as follows; 1. The difference in the value of the wool fineness in different individuals being great, varied from 20 to 32 μ, and the lambs which showed the mean value of the wool fineness from 23 to 25 μ, were most numerous, its number being 46 percent of the total lamb number tested. 2. The difference in the value of the coefficient of variation of the wool fineness in different individuals being also great, varied from 11 to 29 percent, and the lambs which showed the mean value of the coefficient of variation from 12 to 17 percent were most numerous, its number being 80 percent of the total lamb number examined. 3. No high positive correlation was found between the wool fineness and its coefficient of variation, but a positive low correlation was found. 4. When the classifications of the wool fineness and its variation on the tail made in accordance to the measured values were compared with those by naked eyes, it was found that the classifications almost agreed in regard to the wool fineness, but they differed considerably in regard to its variation.