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University of Arizona (1973)

CELL-WALL CONSTITUENTS AND DIGESTIBILITY OF FOUR ALFALFA (MEDICAGO SATIVA, L.) CULTIVARS

Voracheck, Terrance Jerome

Titre : CELL-WALL CONSTITUENTS AND DIGESTIBILITY OF FOUR ALFALFA (MEDICAGO SATIVA, L.) CULTIVARS

Auteur : Voracheck, Terrance Jerome

Université de soutenance : University of Arizona

Grade : Doctor of Philosophy (PhD) 1973

Résumé
Several yield and nutritive quality related factors were deter mined on four alfalfa (l-.’edica.-o sativa L.) cultivars v.,ider field conditions at the Soil Conservation Service Plant Materials Center, Tucson, Arizona. The cultivars were fEl Unico’, ’Sonora1, ’Moapa’, and ’Mesa-Sirsa1. The cultivars were harvested at l/lO and full-bloom stages of maturity. The following parameters were evaluated for each cultivar grown under the two harvest regimes. Percent in vitro digest ible dry matter, apparent digestible (in vitro) dry matter production, consumptive water-use efficiency, dry forage yield, percent neutral detergent fiber (initial and residual)9 and leaflet to stem-petiole ratios were determined and histological comparisons were made. Within-harvest cultivar parameters were not generally different. When compared over the entire collection period, cultivars varied significantly for dry forage yield, apparent digestible dry matter production and leaflet to stem-petiole ratios for both stages of maturity. Mesa-Sirsa produced the most dry forage and apparent digest ible dry matter per unit area for both harvest regimes. Water-use efficiency differences among cultivars were also apparent. Mesa-Sirsa was also the most efficient cultivar with regard to water-use efficiency, while Sonora and Moapa were least efficient for the l/lO and full-bloom stages, respectively.

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