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Evaluation of different sources of bulky associated with grain processing of corn in feeding Nellore in termination

Grant number: 09/12920-1
Support type:Scholarships in Brazil - Master
Effective date (Start): August 01, 2010
Effective date (End): July 31, 2011
Field of knowledge:Agronomical Sciences - Animal Husbandry - Animal Nutrition and Feeding
Principal Investigator:Flávio Augusto Portela Santos
Grantee:Rodrigo da Silva Marques
Home Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil

Abstract

One hundred sixteen yearling Nellore bulls (373 kg IBW) were allotted randomly to 20 pens in order to compare diets with increasing sugarcane bagasse levels (0, 3, 6% DM) and whole flint corn grains (69,5% vitreousness). A treatment with higher crude protein level containing a slow release urea source (Optigen ®) and another containing steam flaked corn, both with 6% bagasse, were also included. The data were analyzed in randomized block design, regression analysis was performed for the treatments that contained various levels of forage and application of orthogonal contrasts between treatments with 6% of forage and whole corn against treatments with 6% of forage with addition of slow-release nitrogen source and against steam flaked corn with 6% of forage. Bagasse inclusion to diets containing whole corn quadraticaly (P<0,05) increased dry matter intake (DMI) and linearly (P<0,05) increased average daily gain (ADG), final body weight (FBW) and hot carcass weight (HCW) but didn´t affect (P>0,05) feed efficiency (ADG/DMI). Increasing diet protein level with inclusion of slow release urea didn´t improve (P>0,05) the performance of animals fed whole corn. Steam flaking corn significantly improved (P<0,05) performance compared to whole corn. Compared to the whole corn and no bagasse diet, steam flaked corn didn´t affect DMI but increased ADG, FBW, HCW and feed efficiency. In relation to the whole corn and 6% bagasse diet steam flaking corn decreased DMI, didn´t affect ADG, FBW and carcass parameters and increased feed efficiency. Bagasse inclusion to whole corn diets as well as slow release urea source didn´t affect diets´ observed energy concentration. However, steam flaking corn expressively increased diet energy content compared to whole corn, with or without bagasse. Bagasse inclusion resulted in linear decrease (P<0,10) on fecal starch concentration with increase on total starch digestibility (TSD) and increase on whole corn grains estimated net energy levels. Corn flaking decreased fecal starch concentration and as a consequence increased total tract starch digestibility and estimated corn grains net energy levels. Liver abscess incidence was negligible. Trial results lead to the conclusion that roughage inclusion to whole corn grain diets improve animal performance and starch digestibility. Steam flaking of flint corn allows higher energy levels e better feed efficiency. Nellore Bulls not respond to the increase in crude protein diet with the inclusion of slow-release nitrogen.

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
MARQUES, R. S.; CHAGAS, L. J.; OWENS, F. N.; SANTOS, F. A. P. Effects of various roughage levels with whole flint corn grain on performance of finishing cattle. JOURNAL OF ANIMAL SCIENCE, v. 94, n. 1, p. 339-348, JAN 2016. Web of Science Citations: 4.
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
MARQUES, Rodrigo da Silva. Efeitos da variação dos níveis de forragem em dietas contendo grãos de milho inteiro e os benefícios da floculação na terminação de tourinhos Nelore. 2011. Master's Dissertation - Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz Piracicaba.

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