Abstract #T283
Section: Ruminant Nutrition
Session: Ruminant Nutrition II
Format: Poster
Day/Time: Tuesday 8:00 AM–9:30 AM
Location: Exhibit Hall B
Session: Ruminant Nutrition II
Format: Poster
Day/Time: Tuesday 8:00 AM–9:30 AM
Location: Exhibit Hall B
# T283
Effects of clay on ruminal degradability of alfalfa hay, grass hay, wet brewer’s grains, ground corn, corn silage, and soybean meal.
M. E. Weatherly*1, S. A. Sulzberger1, A. Pineda1, Y. Khidoyatov2, M. R. Murphy1, F. C. Cardoso1, 1University of Illinois, Department of Animal Sciences, Urbana, IL, 2United Minerals Group, Kyiv, Ukraine.
Key Words: degradability, clay
Effects of clay on ruminal degradability of alfalfa hay, grass hay, wet brewer’s grains, ground corn, corn silage, and soybean meal.
M. E. Weatherly*1, S. A. Sulzberger1, A. Pineda1, Y. Khidoyatov2, M. R. Murphy1, F. C. Cardoso1, 1University of Illinois, Department of Animal Sciences, Urbana, IL, 2United Minerals Group, Kyiv, Ukraine.
Our objective was to determine the ruminal degradability of feedstuffs in response to 3 concentrations of dietary clay in lactating dairy cows. Treatments were: no clay (EcoMix, UMG, Ukraine) (CON), 1% (1%), or 2% (2%) of dietary DM as EcoMix. Samples (8 g) of dried and ground alfalfa hay (AH), grass hay (GH), wet brewer’s grains (WBG), ground corn (GC), corn silage (CS), or soybean meal (SBM) were placed into (3 replicates per feed) polyester bags and incubated for 0, 2, 4, 8, 12, 48, 72, or 96 h in 3 rumen-cannulated cows. Recovered bags were analyzed for DM, NDF, ADF, starch, and CP. Soluble (S), digestible (D), and indigestible (I) fractions of each nutrient, fractional rate of digestion (Kd), and effective degradability (ED) were estimated for each feedstuff, treatment, and cow combination. Statistical analysis was preformed using the MIXED procedure of SAS. Quadratic effects occurred for S and Kd for GH DM. Soluble DM was 0.14, 0.17 and 0.12% DM for CON, 1%, and 2% (P = 0.03). Dry matter Kd for GH was 0.026, 0.015, and 0.022 h−1 for CON, 1%, and 2% (P = 0.02). Linear effects occurred for D and ED for WBG DM. Digestible DM was 0.59, 0.66 and 0.76% DM for CON, 1%, and 2% (P = 0.04). Dry matter ED for WBG was 0.44, 0.41, and 0.31 for CON, 1%, and 2% (P = 0.02). Quadratic effects occurred for S, I, and ED for SBM DM. Soluble DM was 0.26, 0.34 and 0.15% for CON, 1%, and 2% (P = 0.04). Indigestible DM was 0.09, 0.02 and 0.11% for CON, 1%, and 2% (P = 0.02). Dry matter ED for SBM was 0.48, 0.57, and 0.39 for CON, 1%, and 2% (P = 0.002). Linear effects occurred for digestible SBM ADF and soluble and digestible SBM starch. The ADF digestible fraction for SBM decreased linearly for CON, 1%, and 2% with 0.63, 0.47, 0.33% (P = 0.03). Starch soluble fraction for SBM decreased linearly for CON, 1%, and 2% with 0.23, 0.23, 0.18% (P = 0.04). Starch digestible fraction for SBM increased linearly for CON, 1%, and 2% with 0.77, 0.77, 0.82% (P = 0.04). In conclusion, WBG DM decreased linearly with clay supplementation; whereas, that of SBM DM was maximized with clay at 1% of dietary DM.
Key Words: degradability, clay
