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Biblioteca(s): 	INIA La Estanzuela; INIA Tacuarembó.	
Fecha corriente: 	13/09/2017	
Fecha de la última actualización: 	18/09/2017	
Autoria: 	FERRINHO, A.M.; PERIPOLLI, E.; BANCHERO, G.; PEREIRA, A.S.C.; BRITO, G.; LA MANNA, A.; FERNANDEZ, E.; MONTOSSI, F.; BALDI, F.	
Afiliación: 	School of Animal Science and Food Engineering, University of São Paulo, Pirassununga, Brazil; Sao Paulo State University (UNESP), School of Agricultural and Veterinarian Sciences (FCAV), Department of Animal Science, Jaboticabal, Brazil; GEORGGET ELIZABETH BANCHERO HUNZIKER, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; Universidade de São Paulo, Pirassununga, Brazil.; GUSTAVO WALTER BRITO DIAZ, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; ALEJANDRO FRANCISCO LA MANNA ALONSO, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; ENRIQUE GENARO FERNANDEZ RODRIGUEZ, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; FABIO MARCELO MONTOSSI PORCHILE, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; School of Agricultural and Veterinarian Sciences, Sao Paulo State University - FCAV/UNESP, Jaboticabal, Brazil.	
Título: 	Effect of growth rate on beef fatty acid profile from Hereford steers finished either on pasture or in feedlot.	
Año de publicación: 	2017	
Fuente/Imprenta: 	Journal of Animal Science, 2017, v.95, suppl.4. p.180-181.	
DOI: 	10.2527/asasann.2017.365	
Idioma: 	Inglés	
Notas: 	Article history: Published online: August 10, 2017.	
Contenido: 	Abstract: Different nutritional management during the rearing and finishing periods can determine changes on beef fatty acid profile.
Beef lipid composition was quantified in 224 male Hereford calves weaned at 8 wk of age with an average initial live
weight (LW) of 170 ± 17 kg. After weaning, 4 nutritional treatments were imposed to obtain different daily LW gains (LWG;
kg/d) during the first winter. Nutritional management groups were high LWG in feedlot (HF), low LWG in feedlot (LF),
high LWG in pasture (HP), and low LWG in pasture (LP). The finishing phase began when each group reached a mean LW of
350 ± 28 kg. During the finishing phase, one-half of the HF, LF, HP and LP animals were finished on pasture and the other
half in a feedlot. The animals were slaughtered when calves in each treatment attained a mean LW of 500 kg. Analysis
of beef fatty acids was performed by extraction and methylation from LM, and the fatty acids were quantified using a gas
chromatography. The statistical model included the groups at growing phase (HF, LF, HP, and LP) and the groups at finishing
phase (feedlot or pasture) and the interaction between growing and finishing phase as fixed effects and LW at the
beginning of the finishing phase as a covariable. Tukey?s test was applied to compare the means (P < 0.05). There was interaction
between the growing and finishing phases for myristic acid and CLA cis 9, trans 11. Animals from HF finished on
pasture presented the highest concentration of myristic acid (2.54%) when compared with the other treatments. The LP
and HP groups finished on pasture had more CLA cis 9, trans 11 in their beef composition (0.60 and 0.58%, respectively),
whereas animals finished in the feedlot presented the lowest concentrations (average of 0.28%). Finishing phase affected
the fatty acid profile (P < 0.05). Higher concentrations of palmitic, oleic, and linoleic acids were observed in beef from
animals finished in the feedlot than in beef from those finished on pasture. However, the beef from animals finished on pasture
presented high concentrations of stearic, docosapentaenoic, and docosaexaenoic acids. Animals finished on pasture
had higher concentrations of linolenic, arachidonic, and eicosapentaenoic acids compared with those finished in feedlot. Interestingly,
the LP group presented higher concentrations of linolenic and eicosapentaenoic acids, regardless of the finishing
phase. The same results were observed in the LF group for arachidonic acid. In general, the LP and HP groups finished on
pasture resulted in healthy beefs, with the greatest CLA and omega-3 concentrations.	
Palabras-Clave: 	ENGORDE A CORRAL; FINISHING SYSTEM; GROW-OUT; LIPID COMPOSITION; NOVILLOS HEREFORD; PASTURA.	
Thesagro: 	CARNE VACUNA; NOVILLOS; URUGUAY.	
Categoría del tema: 	--
L01 Ganadería	
Registro original: 	INIA La Estanzuela (LE)	
Ejemplares: 	LE - (102194-1) - PXI - AP - DD -  -  -  - DIS
TBO - (102098-1) - PXI - AP - DD -  -  -  - DIS