Changes in the Lipid Metabolism of the <i>Longissimus thoracis</i> Muscle in Bulls When Using Different Feeding Strategies during the Growing and Finishing Phases
Juliana Akamine Torrecilhas,
Guilherme Luis Pereira,
Elias San Vito,
Giovani Fiorentini,
Germán Darío Ramirez-Zamudio,
Larissa Simielli Fonseca,
Rodrigo de Nazaré Santos Torres,
Tiago Adriano Simioni,
Juliana Messana Duarte,
Otavio Rodrigues Machado Neto,
Rogério Abdallah Curi,
Luis Artur Loyola Chardulo,
Welder Angelo Baldassini,
Telma Teresinha Berchielli
Affiliations
Juliana Akamine Torrecilhas
School of Veterinary e Animal Science (FMVZ), São Paulo State University (Unesp), Jaboticabal 14884-900, SP, Brazil
Guilherme Luis Pereira
School of Veterinary e Animal Science (FMVZ), São Paulo State University (Unesp), Jaboticabal 14884-900, SP, Brazil
Elias San Vito
Confina Beef Cattle Consulting, Sinop 78555-603, MT, Brazil
Giovani Fiorentini
Department of Animal Science, Federal University of Pelotas (UFPEL), Pelotas 96160-000, RS, Brazil
Germán Darío Ramirez-Zamudio
College of Animal Science and Food Engineering (FZEA), University of São Paulo (USP), Pirassununga 13635-900, SP, Brazil
Larissa Simielli Fonseca
School of Agriculture and Veterinary Sciences (FCAV), São Paulo State University (Unesp), Jaboticabal 14884-900, SP, Brazil
Rodrigo de Nazaré Santos Torres
School of Veterinary e Animal Science (FMVZ), São Paulo State University (Unesp), Jaboticabal 14884-900, SP, Brazil
Tiago Adriano Simioni
School of Agriculture and Veterinary Sciences (FCAV), São Paulo State University (Unesp), Jaboticabal 14884-900, SP, Brazil
Juliana Messana Duarte
School of Agriculture and Veterinary Sciences (FCAV), São Paulo State University (Unesp), Jaboticabal 14884-900, SP, Brazil
Otavio Rodrigues Machado Neto
School of Veterinary e Animal Science (FMVZ), São Paulo State University (Unesp), Jaboticabal 14884-900, SP, Brazil
Rogério Abdallah Curi
School of Veterinary e Animal Science (FMVZ), São Paulo State University (Unesp), Jaboticabal 14884-900, SP, Brazil
Luis Artur Loyola Chardulo
School of Veterinary e Animal Science (FMVZ), São Paulo State University (Unesp), Jaboticabal 14884-900, SP, Brazil
Welder Angelo Baldassini
School of Veterinary e Animal Science (FMVZ), São Paulo State University (Unesp), Jaboticabal 14884-900, SP, Brazil
Telma Teresinha Berchielli
School of Agriculture and Veterinary Sciences (FCAV), São Paulo State University (Unesp), Jaboticabal 14884-900, SP, Brazil
The objective was to evaluate the supplementation strategy’s effect on beef cattle during the growing phase and two systems during the finishing phase. One hundred and twenty young bulls were randomly divided in a 2 × 2 factorial design to receive either mineral (ad libitum) or protein + energy (3 g/kg body weight (BW)/day) during the growing phase and pasture plus concentrate supplementation (20 g/kg BW/day) or feedlot (25:75% corn silage:concentrate) during the finishing phase. Feedlot-fed bulls had meat (Longissimus thoracis—LT) with a higher content of lipids and saturated and monounsaturated fatty acids and a greater upregulation of stearoyl-CoA desaturase and sterol regulatory element-binding protein-1c than animals that fed on pasture (p p p = 0.02). Mineral-fed and pasture-finished bulls showed down-regulation of peroxisome proliferator-activated receptor gamma (p carnitine palmitoyltransferase 2 expression (p ≤ 0.013). In conclusion, mineral or protein + energy supplementation in the growing does not affect the fatty acid composition of intramuscular fat of LT muscle. In the finishing phase, feeding bulls in the feedlot upregulates the lipogenic genes and consequently improves the intramuscular fat content in the meat.