Sources of polyunsaturated fatty acids on performance and immunological responses of feedlot Nellore cattle

• Grant number: 12/00884-3
• Support Opportunities: Regular Research Grants
• Start date: April 01, 2012
• End date: April 30, 2013
• Field of knowledge: Agronomical Sciences - Animal Husbandry - Animal Nutrition and Feeding
• Principal Investigator: Mário de Beni Arrigoni
• Grantee: Mário de Beni Arrigoni
• Host Institution: Faculdade de Medicina Veterinária e Zootecnia (FMVZ). Universidade Estadual Paulista (UNESP). Campus de Botucatu. Botucatu , SP, Brazil
• Associated researchers: Cyntia Ludovico Martins ; Danilo Domingues Millen ; Rodrigo Dias Lauritano Pacheco

Abstract

The aim of this study is to evaluate the effects of adding sources of natural lipids and rumen-protected polyunsaturated fatty acid in the diet of Nellore in the pre-feedlot and during the feedlot receiving period on plasma concentrations of acute phase proteins, cortisol and proinflammatory cytokines besides the effects on growth performance, carcass characteristics and prevalence of pulmonary hepatization. Will be used one hundred twenty bullocks, Nellore (380kg) from rearing system at pasture. The experimental design is completely randomized design with repeated measurements over time, composed of three diets featuring treatments: (Control) without an additional source of fat, (GDESP) with natural source of lipid-based co-products of cotton, and (GPROT) with protected lipid source rich in polyunsaturated fatty acids. The study will be divided into two phases: pre-feedlot and feedlot. In the first phase (pre-feedlot, 30 d before shipping), the animals are kept on pasture based on supplemental grain with or without addition of lipid as a source of treatment. Blood samples will be collected prior to shipment of animals (d 0) for evaluation of immune responses. After transport to the containment (second phase) will be collected again blood samples on days 1, 3, 7 and 14. The animals will be kept in 24 pens of five animals per pen (10m² and 1m trough per animal), and each treatment will consist of eight pens, which are considered experimental units for this phase of the study. Will be kept the same treatments of the first phase, offering food twice a day (8h and 15h). The confinement will be a period of adaptation (14 d) and finishing period. The animals will be slaughtered in commercial slaughterhouse to achieve weight above 490 kg and subcutaneous fat at least 4 mm, and then collected data on carcass characteristics and pulmonary hepatization (AU)

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)

ROBSON SFACIOTTI BARDUCCI; LUÍS MARCELO NAVE SARTI; DANILO DOMINGUES MILLEN; THAILA CRISTINA PUTAROV; FELIPE AZEVEDO RIBEIRO; MARIA CAROLINE DA SILVA FRANZÓI; CAROLINA FLORET DA COSTA; CYNTIA LUDOVICO MARTINS; MÁRIO DE BENI ARRIGONI. Ácidos graxos no desempenho e nas respostas imunológicas de bovinos Nelore confinados. Pesquisa Agropecuária Brasileira, v. 50, n. 6, p. 499-509, 2015-06-00. (11/01715-8, 12/00884-3)