Brown-midrib corn silage in finishing steer diet: effects on animal performance, in vivo digestibility and ruminal kinetics disappearance
M. J. Spetter A , F. A. Ramiro C , M. M. Della Rosa D , C. S. Maglietti B , J. G. Depetris B , F. J. Santini B C , J. P. Raimondi E , J. M. Roig E and E. Pavan B C F
+ Author Affiliations
- Author Affiliations
A Comisión de Investigaciones Científicas de la Provincia de Buenos Aires, Calle 526 entre 10 y 11 (1900) La Plata, Buenos Aires, Argentina.
B Estación Experimental Agropecuaria Balcarce, Instituto Nacional de Tecnología Agropecuaria, Ruta Nacional 226 km 73.5 (7620) Balcarce, Buenos Aires, Argentina.
C Facultad de Ciencias Agrarias, Universidad Nacional de Mar del Plata, Ruta Nacional 226 km 73.5 (7620) Balcarce, Buenos Aires, Argentina.
D Fondo para la Investigación Científica y Tecnológica, Godoy Cruz 2370 (1425) Ciudad Autónoma de Buenos Aires, Argentina.
E Dow AgroSciences, Ruta Nacional 8 km 264 (2720), Colón, Buenos Aires, Argentina.
F Corresponding author. Email: pavan.enrique@inta.gob.ar
Animal Production Science 59(3) 486-492 https://doi.org/10.1071/AN17585
Submitted: 23 August 2017 Accepted: 30 December 2017 Published: 6 April 2018
Abstract
Lower lignin content in brown-midrib corn silage (BMRCS) than in conventional corn silage results in greater digestibility and dry-matter intake. Despite this advantage, the use of BMRCS has not been widely evaluated in beef cattle. The aim of the present study was to determine the effects of BMRCS chopped at 22-mm as the main component (79% DM basis) for finishing steer diet on digestion, animal performance and ruminal kinetics disappearance. In a first trial, 56 Angus and crossbred steers (339 ± 18 kg initial bodyweight) were divided into 14 pens that were randomly assigned to one of the following two treatments: BMR total mixed ration (BMRT) or conventional total mixed ration. Data were analysed under a completely randomised design using pen as the experimental unit (n = 7). In a second trial, BMRCS and conventional corn silage were incubated (0, 3, 6, 12, 24, 36, 72 and 120 h) in the rumen of three ruminally cannulated cows. Data were analysed under a completely randomised block (cow) design. The inclusion of BMRCS in 79% corn silage diet for finishing steers improved total diet neutral detergent fibre and acid detergent fibre digestibility, but did not improve DM digestibility. While there was no significant improvement in animal performance, carcass yield was improved in BMRT. Future studies are needed to evaluate the improvement of carcass weight in steers fed BMRT.
Additional keywords: beef cattle, BMR, fibre digestibility, lignin.
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