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Effects of Enogen Feed corn silage and corn grain on nutrient digestibility, production, and enteric methane emission in lactating cows.

L. Rebelo

Abstract:

M24
Effects of Enogen Feed corn silage and corn grain on nutrient digestibility, production, and enteric methane emission in lactating cows.
L. Rebelo*1, C. Lee1, W. Weiss1, M. Eastridge2. 1The Ohio State University Wooster, OH, 2The Ohio State University Columbus, OH.

Increasing rumen starch digestibility can improve production and feed efficiency. Corn that was developed to contain high α-amylase expression (Enogen Feed, Syngenta Seeds, LLC, Downers Grove, IL) was evaluated on nutrient digestibility, production, and CH4 emission in lactating cows. Enogen and isoline corn were grown and harvested for corn silage (CS) and corn grain (CG). Fifteen cows (6 ruminally cannulated; 9 non-cannulated) were used in a replicated 3 � 3 Latin square design (5 orthogonal squares; 14-d adaptation and 14-d sampling in each period). Dietary treatments were: isoline CS and isoline CG (CON); Enogen CS and isoline CG (ECS); Enogen CS and Enogen CG (ECSCG). The diets included 48% CS and 19% CG (DM basis) and contained 15.5% CP, 31% NDF, and 29% starch (DM basis). A 4-d total collection of feces was conducted for nutrient digestibility with cannulated cows, and CH4 was measured in 8 equally spaced times throughout 3 d using Greenfeed (C-Lock Inc.) from non-cannulated cows. Production was obtained from all cows. Data were analyzed using the MIXED procedure of SAS with treatment and period as fixed and cow and cow within square as random effects. Total-tract digestibility of DM, OM, CP, and NDF were not different among treatments. Compared with CON, ECS and ECSCG increased DMI (26.7 and 26.6 vs. 25.1, respectively; P < 0.01). Milk yield increased only for ECS compared with CON (36.5 vs. 33.1 kg/d; P = 0.03). Energy-corrected milk was not affected (34.5, 36.4, and 35.6 kg/d for CON, ECS, and ECSCG, respectively). Milk protein yield was greater (P = 0.02) for ECS vs. CON and ECSCG (no difference between CON and ECSCG). Milk fat content tended to be lower (P = 0.06) for ECS vs. CON and ECSCG (no difference between CON and ECSCG). Methane yield decreased (11.5 vs. 13.5 g/kg DMI; P = 0.04) only for ECS vs. CON. In conclusion, ECS increased milk and protein yields and lowered CH4 yield compared with CON, possibly because of greater starch availability in the rumen. However, ECSCG had only numerical effects on milk and ECM yields compared with CON.

Keywords: Enogen corn grain, Enogen corn silage, production.

Biography: Lucas accomplished his B.S.�and M.S. degrees in animal sciences at the�Federal University of Mato Grosso and Sao Paulo State University, respectively; and, is currently pursuing his Ph.D. in Environmental-Animal Sciences at the Ohio State University.