Abstract
Influence of different levels of corn steep liquor (CSL) on chemical composition of urea treated wheat straw (UTWS) and its dietary effect on nutrient intake, digestibility, milk yield and its composition were studied. The 5% UTWS was ensiled with 0, 3, 6 and 9% CSL on dry matter (DM) basis. Total nitrogen and neutral detergent fiber (NDF) contents of UTWS ensiled with 0, 3, 6 and 9% CSL increased linearly with the increasing level of CSL. Increase in NDF content was due to increased neutral detergent insoluble nitrogen contents. Four experimental diets were formulated to contain 35% UTWS ensiled without CSL (control), 45 (WS45), 55 (WS55) and 65% (WS65) UTWS ensiled with 9% CSL, respectively. Dry matter, NDF and acid detergent fiber (ADF) intakes by lactating buffaloes fed diets containing varying levels of UTWS ensiled with or without CSL remained similar across all treatments. However, DM, NDF and ADF intakes as a percent of body weight and digestible DM, NDF and ADF intakes were higher in animals fed WS65 diet compared to those fed other diets. Apparent DM, crude protein (CP), NDF and ADF digestibilities were higher in diets containing UTWS ensiled with CSL compared to control. These differences may be attributed to higher rates of degradability of UTWS ensiled with 9% CSL than that ensiled without CSL. The 4% fat corrected milk and CP were statistically higher with WS65 diet compared to other diets. Percent milk fat, solid not fat and total solid remained unchanged across all treatments.
Highlights
Crop residues especially wheat and rice straws are being recognized most important contributors to dairy diets in developing regions of the world (Mehra et al, 2001).their poor nutrient balance and digestibility limit the performance of animals
1.25 three laboratory silos per mixture were prepared and were sealed and stored in the incubator at 40°C. The samples of this fermented wheat straw were analyzed for dry matter (DM), organic matter (OM), neutral detergent insoluble nitrogen (NDIN), acid detergent insoluble nitrogen (ADIN), N and ash by the methods of AOAC (1990), neutral detergent fiber (NDF), acid detergent fiber (ADF) and acid detergent lignin (ADL)
WS35 contained 35% urea treated wheat straw ensiled without corn steep liquor (CSL), while WS45, WS55 and WS65 contained 45, 55 and 65% urea treated wheat straw ensiled with 9% CSL, respectively
Summary
Crop residues especially wheat and rice straws are being recognized most important contributors to dairy diets in developing regions of the world (Mehra et al, 2001) Their poor nutrient balance and digestibility limit the performance of animals. These feeds are characterized by high content of indigestible fiber due to increased lignification of cellulose that causes the reduction in digestibility. The corn steep liquor (CSL) may offer a solution to the problem of escaping NH3 and poor fermentation of urea treated wheat straw (UTWS) Because it does contain soluble carbohydrates, which can improve fermentation, but it contains 20% lactic acids (Table 1), which may help to fix the excess NH3. The present study was planed to evaluate different levels of UTWS with or without CSL on feed intake, milk yield and its composition and digestibility in buffaloes
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