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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 2006;19(4): 507-513.
DOI: https://doi.org/10.5713/ajas.2006.507    Published online February 1, 2006.
Factors Affecting In vitro True Digestibility of Napiergrass
Chia-Sheng Chen, Su-Min Wang, Jih-Tay Hsu*
Correspondence:  Jih-Tay Hsu,
Abstract
Changes of in vitro true digestibility (IVTD) of Napiergrass (Pennisetum purpureum) were determined by a filter bag system, and their relationships to chemical composition, leaf to stem ratio, plant height, geographic location, climatic factors and harvest interval were studied and used to develop prediction models for the crude protein (CP), acid-detergent fiber (ADF), and neutraldetergent fiber (NDF) contents and IVTD. Partitioning the total variance of IVTD of Napiergrass showed that 80% was attributable to the effect of harvest interval. Days of growth, plant height, leaf/stem ratio, CP, ADF and NDF of Napiergrass had highly significant relationships (p<0.01) with IVTD. The highest coefficient of correlation between the ADF, NDF, and IVTD of Napiergrass and growth degree days was obtained when the base temperature was set at 0?? Growth degree days could predict ADF, NDF, and IVTD of Napiergrass more accurately than plant height, and plant height is not suitable to predict IVTD.
Keywords: Pennisetum purpureum; Napiergrass; Digestibility; Harvest Interval; Plant Morphology; Growth Degree Days


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