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http://dx.doi.org/10.5713/ajas.2006.507

Factors Affecting In vitro True Digestibility of Napiergrass  

Chen, Chia-Sheng (Hengchun Research Branch Institute, Taiwan Livestock Research Institute)
Wang, Su-Min (Hengchun Research Branch Institute, Taiwan Livestock Research Institute)
Hsu, Jih-Tay (Department of Animal Science and Technology, National Taiwan University)
Publication Information
Asian-Australasian Journal of Animal Sciences / v.19, no.4, 2006 , pp. 507-513 More about this Journal
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 neutral-detergent 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 $0^{\circ}C$. 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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