Graduate Thesis Or Dissertation

 

Genetic variation and interrelationships of acid detergent fiber, neutral detergent fiber, hemicellulose, crude protein and in vitro dry matter digestibility in tall fescue (Festuca arundinacea Schreb) Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/3484zm17g

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  • Six parent clones and their 15 single-crosses of tall fescue (Festuca arundinaceae, Schreb) were row-planted in Corvallis, Oregon, row and sward-planted in Columbia, Missouri, and evaluated for genetic variability, genotyp-eenvironment interactions and interrelationships in acid detergent fiber (ADF), neutral detergent fiber (NDF), hemicellulose (HCL), crude protein (CP) and in vitro dry matter digestibility (IVDMD) for each harvest in 1977 and 1978. Analyses revealed that general combining ability or additive genetic effects predominated for all the measured characteristics in the tall fescue diallel cross population. Of the genotype-environment interactions, only general combining ability x harvest interaction effects were significant enough to warrant consideration. The results also suggest that general combining ability of the parents rather than actual parental performance is a better predictor of hybrid progeny performance for all the characteristics. Parent-progeny regressions reveal that ADF is a more transmissible trait than NDF, IVDMD, HCL, or CP. ADF and NDF were highly and significantly correlated to IVDMD while HCL and CP were poorly correlated to IVDMD. It is suggested that the results obtained can have wider applicability to other tall fescue growing areas and populations. The results indicate that a selection program based on progeny testing for general combining ability for low ADF under row-planted conditions in one location for all harvest seasons over one or two years would efficiently and conveniently result in a rapid indirect selection improvement for digestibility in tall fescue.
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