PSXVI-6 Ruminal dry Matter Disappearance, Methane Production and Fermentation Parameters as Affected by fat and Protein Concentration in by-Product Supplemented Grass hay-Based Diets

Abstract This batch culture study evaluated the effects of crude protein (CP) and fat concentration on ruminal dry matter disappearance (DMD), methane (CH4) production, fermentation in grass hay-based diets supplemented with by-product feeds. Eight treatments provided low or high CP (8 12% DM, respectively), a range concentrations (1.8 to 6.0% DM) included following: Control (grass hay only); corn distillers grains solubles at 8.0% (CDDGS8) (CDDGS12); flax 8% (FS8) (FS12); canola meal (Can8); sunflower screenings from Winkler (SFW8) Deloraine (SFD8) 8%. Data were analyzed as randomized complete block design, fixed effect treatment random × block. Comparisons performed between a) mean b) c) CDDGS treatments, d) FS e) SF treatments. both concentrations, well differing also conducted. Overall, DMD did not differ treatments; however, comparisons indicated decreased (P < 0.001) compared CP. The was greater (P≤0.009) fat, regardless Methane production any but (P≤0.003) CP, vs SFD SFW. No parameters observed. In conclusion, increased vitro affect CH4 fermentation. Additionally, dietary can mitigate enteric negatively impact diets.