Título:	Could the breed composition improve performance and change the enteric methane emissions from beef cattle in a tropical intensive production system?
Autor:	MACIEL, I. C. de F. BARBOSA, F. A. TOMICH, T. R. PEREIRA, L. G. R. ALVARENGA, R. C. LOPES, L. S. MALACCO, V. M. R. ROWNTREE, J. E. THOMPSON, L. R. LANA, A. M. Q.
Afiliación:	Isabella Cristina de Faria Maciel, Universidade Federal de Minas Gerais; Fabiano Alvim Barbosa, De Heus Animal Nutrition B. V.; THIERRY RIBEIRO TOMICH, CNPGL; LUIZ GUSTAVO RIBEIRO PEREIRA, CNPGL; RAMON COSTA ALVARENGA, CNPMS; Leandro Sâmia Lopes, Universidade Federal de Minas Gerais; Victor Marco Rocha Malacco, Universidade Federal de Minas Gerais; Jason E. Rowntree, Michigan State University; Logan R. Thompson, Michigan State University; Ângela Maria Quintão Lana, Universidade Federal de Minas Gerais.
Año:	2019
Referencia:	PlosONE, v. 14, n. 7, e0220247, July 2019.
Descripción:	Crossbreeding has been used to improve performance in beef cattle, however the effects of breed composition on methane (CH4) production, yield and intensity from cattle raised in tropical intensive and integrated systems remain unknown. To assess the impact of breed composition on performance and methane emissions, Nellore (NEL; yr 1: BW = 171.5± 19.4 kg; n = 10; yr 2: BW = 215.8±32.3 kg, n = 25) and Angus x Nellore crossbred (AN; yr 1: BW = 214.2±26.4 kg, n = 10; yr 2: BW = 242.5±32.2 kg, n = 25) were compared. The animals grazed on integrated crop-livestock system in the growing phase (stocking rate 2452 kg BW/ha, herbage mass 4,884 kg dry matter (DM)/ha, forage allowance 5.9 kg DM/100kg BW) and then were finished in a feedlot. Steers (n = 8) from each breed composition were randomly selected in each phase to measure CH4 production using a sulfur hexafluoride (SF6) tracer technique and DM intake (DMI) using titanium dioxide. Compared with NEL, AN had both superior total gain and average daily gain (ADG) in the grazing period. The AN presented greater ADG in the feedlot with a shorter finishing period and resulted in greater carcass yield and carcass ADG. Methane production (kg/period) was lower in NEL (19% less) than AN in grazing (P<0.01), and no difference was observed in feedlot. The NEL had less CH4 intensity (CH4/BW) in grazing but greater CH4 per unit of ADG in the feedlot compared to AN. Breed composition did not influence the CH4 yield (CH4/DMI) in either phase, despite the difference in feedlot DMI (kg/day). In conclusion, crossbreeding may be an option to improve performance and reduce the CH4 per ADG in tropical climate conditions, resulting in lower methane emission per kg of meat produced.
Thesagro:	Gado de Corte Raça Cruzamento Animal Gás Metano Sistema de Cultivo Clima Tropical
Palabras clave:	Sistema integrado Integração lavoura-pecuária
DOI:	https://doi.org/10.1371/journal.pone.0220247
Tipo de Material:	Artigo de periódico
Acceso:	openAccess
Aparece en las colecciones:	Artigo em periódico indexado (CNPGL)