家蚕品种资源茧丝性状的调查报告

对２０９个家蚕保育品种的茧丝长进行调查，平均丝长８４０ｍ，最长１２７３ｍ，最短３４４ｍ。各类品种中以中系二化品种最长，日系二化次之，多化最短。解舒率的调查结果是，平均值７９．４％，最高１００．Ｏ％，最低４１．５％，９０．０％以上的品种３１个。解舒率多化品种和日本系统品种较好，中系和欧系品种较差。平均解舒丝长６６３ｍ，最长１０４３ｍ，最短２７４ｍ。调查２１８个品种的净度，平均９３．９分，最高９９．２分，最低７６．７分，９８分以上的品种１８个，多化品种净度最好，二化品种次之，一化品种最差。调查了２００个品种的茧丝量，平均０．２３３克，最高０．３５４克，最低０．０７１克。以日系一化品种最高，二化品种次之，多化品种最低。

A KEPORT FROM THE INVESTIGATION OF COCOON FILAMENT PKOPERTIES OF SILKWORM VARIETY RESOURCES

preserved silkworm varieties were investigated on their cocoon filament proper-ties。The results showed that,average filament length was 840 meters(longest:1273,shortest:344).Filament length of bivoltine varieties of Chinese strain ranked the firstfollowed by that of bivoltine varieties of Japanese strain and polyvoltine varieties.Aver-age reelability percentage was 79.4%(highest:100.0%,lowest:41.5%).There were 31varieties with a reelability percentage over 90.0%.Polyvoltine varieties and varieties ofJapanese strain had better reelability than those of Chinese and European strains.Aver-age non broken filament length was 663 meters(longest:1043,shortest:274).Averageneatness of 218 varieties surveyed was 93.9 points(highest:99.2,lowest:76.7).Therewere 18 varieties with a neatness over 98.0 points.The neatness of polyvoltine varietieswas the best,whereas that of bivoltine varieties was better than univoltine ones .Averagecocoon filament weight of 200 varieties surveyed was 0.223gram/cocoon(highest:0.354,lowest:0.071).It was the highest in univoltine varieties of Japanese strain fol-lowed by bivoltine varieties.It was the lowest in polyvoltine varieties。