PREDICTION OF NUTRITIVE VALUES FOR SOME ROUGHAGE FEEDS USING CHEMICAL COMPOSITION AND IN SITU DEGRADABILITY | ||
| Journal of Animal and Poultry Production | ||
| Article 1, Volume 32, Issue 11, November 2007, Pages 8901-8913 PDF (675.08 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jappmu.2007.220963 | ||
| Author | ||
| N. M. Eweedah, | ||
| Animal Production Department, Faculty of Agriculture Kafr El-Sheikh University, Egypt. | ||
| Abstract | ||
| The rumen degradation characteristics and effective degradability (ED) of dry matter (DM) and crude protein (CP) of nine roughages were studied in four adult bulls fitted with rumen cannulaee using the nylon bag technique for rapid screening of some of the promising fodders and to develop a prediction equation for estimation of ED of DM and CP from chemical composition of different tested roughages. Roughages used are: 1- Berseem hay 3rd cut (BH); 2- Pea vine hay (PVH); 3- Peanut vine hay (PNVH); 4- Dried sugar beet tops (DSBT); 5- Elephant grass (EG); 6- Fodder millet (FM); 7- Fodder sorghum (FS), 8- Whole corn plant silage without additives (WCPS); 9- Corn stover silage prepared by addition 0.5% urea and 5% molasses at ensiling time (CSS). Samples from each roughage were incubated in the rumen of each animal for 0, 2, 4, 8, 16, 24 and 48 hrs, respectively. The disappearance rates of N or DM were used to calculate the rapidly soluble fraction ("a" value), potentially degradable fraction ("b" value) and the fractional degradation rate of "b" ("c" value) the effective degradability of N and DM was then estimated assuming a ruminal outflow rate of 0.02, 0.05 and 0.08/h (P0.02, P0.05 and P0.08). The results indicated high positive relationships between CF content and its fractions (NDF and ADF). There were significant differences for immediately degradable fraction "a" among the different kinds of roughages. Moreover, effective degradability of DM decreased with increase in outflow rates. The degradability of N was consistently greater than DM. The data showed low relationship between N degradability rate and CF content and its fractions (ADF, NDF and ADL) for a variety of roughages. The results also indicated that, for prediction of the P0.02, P0.05 and P0.08 of N using CP or NFE concentration as a predictor produced greater r2 values than using ADF, NDF or ADL. The regression equation showed that OM, NDF, ADF and water soluble DM "a" were well correlated with in sacoo ED of DM while for ED of CP the best correlation was with NFE and the water soluble protein "a" fraction. | ||
| Keywords | ||
| roughages; chemical components; degradability; prediction equations | ||
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