Studies of variability, heritability and correlations in cocksfoot
Tarakanovas, P.(Lithuanian Inst. of Agriculture, Dotnuva- Akademija, Kedainiai reg. (Lithuania))E-mail:[email protected] | Kanapeckas, J.(Lithuanian Inst. of Agriculture, Dotnuva- Akademija, Kedainiai reg. (Lithuania))E-mail:[email protected] | Lemeziene, N.(Lithuanian Inst. of Agriculture, Dotnuva- Akademija, Kedainiai reg. (Lithuania))E-mail:[email protected]
Economically valuable features such as dry matter yield (DMY) of first cut, DMY of aftermath, annual DMY, height of plant, days to heading, leafiness, digestibility, crude protein and crude fiber were studied in 18 varieties and populations of cocksfoot (Dactilis glomerata sp. glomerata L.) in the period 0f 2002-2003 at the Lithuanian Institute of Agriculture (Dotnuva). Applying a covariance analysis, the genotypic and phenotypic coefficients of variation, correlation and broad sense heritability were studied. For all traits, the phenotypic coefficients of variation were higher than the genotypic coefficients. The heritability was lowest for crude protein content (0.09) and highest for days to heading (0.83). By annual DMY (11.45-12.07 haE-1), five new cocksfoot breeding lines (Nos. 2555, 1927, 1316, 1260 and 1262) reliably (P less than 0.05) exceeded the standard cultivar 'Aukstuole' (by 7.16-12.86%). Among the breeding lines studied, only three (Nos. 1164, 1327 and 2196) showed a reliably (P less than 0.05) better dry matter digestibility (65.47-66.41%) as compared to the standard (60.14%).
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