期刊
REVISTA BRASILEIRA DE ZOOTECNIA-BRAZILIAN JOURNAL OF ANIMAL SCIENCE
卷 40, 期 11, 页码 2565-2573出版社
REVISTA BRASILEIRA ZOOTECNIA BRAZILIAN JOURNAL ANIMAL SCI
DOI: 10.1590/S1516-35982011001100039
关键词
F57; in situ method; non-woven textile; nylon
The objective of this study was to evaluate the in situ degradation profiles of dry matter (DM) and neutral detergent fiber (NDF) of different forages using nylon (50 mu m), F57 (Ankom (R)) and non-woven textile (NWT - 100 g/m(2)) bags. Eight forage samples were used: sugarcane, corn silage, elephant grass cut at 50 and 250 days of regrowth, corn straw, signal grass hay, coast cross hay, and fresh alfalfa. Samples were incubated for 0, 3, 6, 12, 18, 24, 48, 72, 96, 120, 144, 168, 192, 216, 240, and 312 hours. Two bags of each textile were used at each incubation time, totaling 768 bags, using two crossbred Holstein x Zebu steers fitted with ruminal canullae. There was difference in the common rate of lag and degradation (lambda) of DM for all forages, except for sugarcane. In general, higher lambda estimates were obtained using nylon, followed by NWT and F57. Concerning NDF degradation profiles, differences in lambda were observed for all forages. Greater estimates were obtained using nylon. Degradation profiles of DM and NDF must not be evaluated using F57 and NWT. These textiles underestimate the degradation rate due to constraints regarding exchange between bags' content and rumen environment.
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