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Protocols for combined use of sodium monensin and virginiamycin in feedlot Nellore cattle diets

Grant number: 13/21672-7
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): March 01, 2014
Effective date (End): October 31, 2015
Field of knowledge:Agronomical Sciences - Animal Husbandry - Animal Nutrition and Feeding
Principal Investigator:Danilo Domingues Millen
Grantee:André Luiz Nagatani Rigueiro
Host Institution: Universidade Estadual Paulista (UNESP). Campus Experimental de Dracena. Dracena , SP, Brazil


The objective of this study will be to evaluate the effect of the combined use of Monensin (MON) and Virginiamycin (VM) in the adaptation and finish period on performance, feeding behavior, carcass traits and rumen health of Nelore cattle finished in feedlot. One hundred 22-mo-old yearling Nellore bulls (370 kg), backgrounded on pasture will be randomly allocated and kept in 24 pens (5,4 m² and e 0,8 m bunk per animal) according to the treatments: 1) MON (30 mg/kg) in the adaptation and finish period; 2) MON (30 mg/kg ) + VM ( 25 mg/kg) in adaptation and only VM (25 mg/kg) in finish; 3 ) MON (30 mg/kg) + MV (25 mg/kg) in adaptation and VM (25 mg/kg) + MON (30 mg/kg ) in finish; 4 ) MV (25 mg/kg) in adaptation MON (30 mg/kg) + VM (25 mg/kg) in finish, thus characterizing a completely randomized design. Each treatment will be composed by 6 replications (pens) in this study. At the beginning of experimental period and every 28 days yearling bulls will be weighed. Dry matter intake will be measured every day, and average daily gain and feed efficiency will be calculated. Likewise, the deposition of muscle and fat will be evaluated by ultrasound at the beginning and at the end of the study. Yearling bulls will be slaughtered in a commercial abattoir when an average body weight of 490 kg is reached after 84 days on feed. Samples of rumen epithelium, feces and blood will be collected for future analysis of rumen health, metabolic blood profile and starch and NDF digestibility, respectively. (AU)

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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)
RIGUEIRO, A. L. N.; PEREIRA, M. C. S.; SQUIZATTI, M. M.; FERREIRA, M. M.; DONDE, S. C.; LUIZ, F. P.; SILVESTRE, A. M.; MULLER, L. R.; GARCIA, C. P.; BUENO, A. P. D.; et al. Different combinations of sodium monensin and virginiamycin during feedlot finishing of Nellore cattle. ANIMAL PRODUCTION SCIENCE, v. 60, n. 8, p. 1061-1072, . (13/25403-0, 13/21672-7)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
RIGUEIRO, André Luiz Nagatani. Protocols for combined use of sodium monensin and virginiamycin in feedlot Nellore cattle diets. 2016. Master's Dissertation - Universidade Estadual Paulista (Unesp). Faculdade de Ciências Agrárias e Tecnológicas. Dracena Dracena.

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