Fluence of Some Nitrogen Sources on Fermentation and Digestion of Different Poor Quality Roughages. 1. The Dry Matter, Neutral Detergent Fiber and Acid Detergent Fiber Disappearance of Low Quality Roughages and Some Rumen Parameters in Sheep.

Abstract

Three mature male ruminally canulated sheep were fed at 90% of their ad libitum intake. The three control rations, one from each tested roughage were formulated along with concentrate feed mixture CFM at the commonly practiced ratio being: 30% rice straw RS + 70 CFM 30% maize stalks MS + 70 CFM 40% clover straw CS + 60 CFM With the objective of increasing the use of roughage, six tested diets were formulated two from each roughage by almost doubling their ratio as in the respective control diets and reducing the traditional CFM as a protein supplement to less than one half by either quality soybean meal SBM ,10% or equivalent urea U, 1.2% as follows: 1. 60 % RS + 30% CFM + 10% SBM 2. 60 % RS + 38.8% CFM + 1.2% U 3. 60 % MS + 30% CFM + 10% SBM 4. 60 % MS + 38.8% CFM + 1.2% U 5. 75 % CS + 17% CFM + 8% SBM 6. 75 % CS + 24 % CFM + 1.0% U These proportions were chosen to achieve iso-nitrogenous diets containing about 12% CP necessary for optimal utilization and fermentation of roughages in the rumen rskov et al., 1972.The in situ dry matter disappearance DMD values increased significantly P<0.01 when feeding on CS than MS or RS 50.63, 40.24 and 34.17%, respectively and the neutral detergent fiber disappearance NDFD% increased significantly P<0.01 when feeding on CS than MS or RS 29.81, 28.48 and 27.49%, respectively. The acid detergent fiber disappearance ADFD% followed the same trend of NDF disappearance %. The potential degradability a+b of DM for CS and MS were higher P<0.01 than RS 56.72, 56.37 and 54.08, respectively. The potential degradability a+b of NDF for MS was higher significantly P<0.01 than RS and CS (53.32, 48.32 and 37.91%, respectively). The potential degradability (a+b) of Mehrez, A.Z. et al. 6760ADF for MS and RS were higher (P<0.01) than CS (55.64, 55.08 and 47.05, respectively).The mean rumen volatile fatty acids (VFA) values increased significantly (P<0.01) when feeding on MS than CS or RS (9.30, 8.68 and 8.5 ml Eql/100 ml RL, respectively), and the concentration of NH3 was higher (P<0.01) when feeding on MS than CS or RS (18.86, 16.4 and 15.71 mg/100 ml RL, respectively).The DMD% increased significantly when added CFM+U than CFM+SBM or CFM (42.85, 41.93 and 40.26, respectively). The NDFD and ADFD% followed the same trend in DMD (29.74, 28.36 and 27.69, respectively), and (35.97, 35.08 and 34.91, respectively). The potential degradability (a+b) of DM increased significantly (P<0.01) when added CFM+U or CFM+SBM than CFM (56.83, 56.65 and 53.69%, respectively). The potential degradability (a+b) of NDF increased significantly when added CFM+SBM than CFM+U or CFM (48.4, 46.59 and 44.63%, respectively). The potential degradability (a+b) of ADF increased significantly when added CFM+SBM than CFM or CFM+U (56.75, 51.65 and 49.37%, respectively). The buffering capacity (BC) values increased significantly (P<0.01) when added CFM+U than CFM or CFM+SBM (11.03, 10.26 and 9.64 ml Eq./100ml RL, respectively). The VFA values were increased significantly (P<0.01) when ...

Influence of Some Nitrogen Sources on Fermentation and Digestion of Different Poor Quality Roughages. 2. The Digestion Coefficients, Feed Intake, N-Balance and Feeding Value of Rations.

“…It was surprising to record that the TDN of the diet containing CFM+U was even slightly higher than the control despite the small improvement in the fermentable NDF and the appreciable reduction in the fermentable ADF. However, it was observed that the rate of ADF disappearance of such diet was much faster than when CFM+SBM was used allowing faster cell wall breakdown and possibly longer retention time in the rumen (Nandra et al, 1993), which might partly explain the slight improvement in the TDN value (see Mehrez et al, 2001).…”