Accumulation of digestible materials and decrease in dry matter digestibility in the growth of two tropical grasses
1998
Shimojo, M. (Kyushu Univ., Fukuoka (Japan). Faculty of Agriculture) | Bungo, T. | Tobisa, M. | Imura, Y. | Koga, N. | Tao, S. | Yunus, M. | Yin, Z. | Nakano, Y. | Goto, I. | Masuda, Y.
This study was conducted to analyze the accumulation of digestible materials from digestible materials present in forage and new photosynthates and to analyze the decrease in dry matter digestibility with growth of two tropical grasses, using the following two equations. (equations: leave out) Two equations were applied to dall is grass (Dg) and bermuda grass (Bg) cut at 20, 59 and 80 days of regrowth. Each attribute in two equations was given a bar on it to show mean value over the first interval of 39 days and over the second interval of 21 days, respectively. The following results were obtained: 1) Dg: Higher ARD in the first interval compared to the second interval was due to higher ARDS in the first interval. Similar DDMD between two intervals was due to the offset effect between FG index and DDMPD index. 2) Bg: Lower ARD in the first interval than in the second interval was due to lower ARDS in the first interval. The larger DDMD in the first interval compared to the second interval was due to higher DDMPD index in the first interval. 3) First interval: Higher ARD in Dg than in Bg was mainly due to higher ARDS in Dg. Almost the same DDMD between Dg and Bg was due to the offset effect between FG index and DDMPD index. 4) Second interval: Lower ARD in Dg than in Bg was due to lower ARDS in Dg. The larger DDMD in Dg compared to Bg was due to higher DDMPD index in Dg. It was suggested that the proposed method gave macro analyses of the accumulation of digestible materials and the decrease in dry matter digestibility with growth of tropical grasses
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