Abstract #W302
Section: Ruminant Nutrition
Session: Ruminant Nutrition: Beef III
Format: Poster
Day/Time: Wednesday 7:30 AM–9:30 AM
Location: Gatlin Ballroom
Session: Ruminant Nutrition: Beef III
Format: Poster
Day/Time: Wednesday 7:30 AM–9:30 AM
Location: Gatlin Ballroom
# W302
Flint corn processing methods and dietary concentrations of roughage NDF for finishing cattle: 1. Intake and digestibility of nutrients.
Antonio Humberto Fleury de Melo1, Murillo Alves Porto Meschiatti1, João Meneghel de Moraes1, Camila Delveaux Araujo Batalha1, Lucas Jado Chagas1, Débora de Carvalho Basto1, Jonas de Souza1, Nayana Carla Gonçalves Barbosa2, Flávio Augusto Portela Santos*1, 1University of São Paulo, Piracicaba, São Paulo, Brazil, 2Federal University of Goiás, Jataí, Goiás, Brazil.
Key Words: feedlot, steam-flaked corn, roughage NDF
Flint corn processing methods and dietary concentrations of roughage NDF for finishing cattle: 1. Intake and digestibility of nutrients.
Antonio Humberto Fleury de Melo1, Murillo Alves Porto Meschiatti1, João Meneghel de Moraes1, Camila Delveaux Araujo Batalha1, Lucas Jado Chagas1, Débora de Carvalho Basto1, Jonas de Souza1, Nayana Carla Gonçalves Barbosa2, Flávio Augusto Portela Santos*1, 1University of São Paulo, Piracicaba, São Paulo, Brazil, 2Federal University of Goiás, Jataí, Goiás, Brazil.
The objective of this trial was to evaluate intake and total-tract apparent digestibility (AD) of nutrients in finishing diets containing flint corn (70 – 75% vitreous endosperm) either ground (particle size: 2.70 mm) or steam-flaked (bulk density: 360 g/L), combined with dietary contents of 4, 7, 10 or 13% (DM basis) NDF from sugarcane bagasse. Sixteen Nellore bulls (BW = 484.46 ± 7.47 kg) fitted with rumen cannula, were fed diets containing 76–86% corn and randomly allocated to 16 pens for 2 periods (14 d for adaptation and 6 d for collection) in a 2 × 4 factorial arrangement. Total feces collection was carried out for 4 d. During the collection period the amount of diet offered was restricted to 85% of previous ad libitum intake. The data were analyzed using a PROC MIXED model with period and animal as random effect. Linear and quadratic effects were tested for dietary concentrations of roughage NDF. There were no interactions between corn processing and dietary concentrations of sugarcane bagasse NDF. Steam flaking of flint corn tended (P = 0.07) to decrease DMI (7.76 vs. 7.28 kg.d−1), it decreased (P < 0.01) AD of NDF (50.73 vs. 33.12%) and of crude protein (75.05 vs. 71.93%), but it increased (P < 0.01) AD of DM (73.45 vs. 77.38%) of TCHO (75.19 vs. 81.93%), of NFC (84.1 vs. 95.16%) and of starch (95.95 vs. 99.36%). Steam flaking increased (P < 0.01) dietary TDN concentration (80.26% vs. 84.22%) but had no effect (P = 0.73) on TDN intake (6.22 vs. 6.15 kg.d−1). Increasing roughage NDF content of the diets caused a quadratic response for DMI (6.95, 7.90, 7.80 and 7.41 kg.d−1, respectively) and nutrient intakes and a linear decrease for AD of DM (78.80; 75.95; 75.90 and 72.80% respectively), of TCHO (81.55, 78.76, 78.86 and 75.07% respectively) and had no effect (P = 0.40, 0.11, 0.94 and 0.29, respectively) on AD of NDF, NFC, CP, EE and starch. In conclusion, steam flaking increases energy value of flint corn and feeding around 7% of sugarcane bagasse NDF in finishing diets optimizes energy intake of Nellore bulls.
Key Words: feedlot, steam-flaked corn, roughage NDF
