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Productive performance, meat quality and fatty acid profile of steers finished in confinement or supplemented at pasture

Published online by Cambridge University Press:  18 February 2015

H. O. Patino ,
F. S. Medeiros ,
C. H. Pereira ,
K. C. Swanson  and
C. McManus
H. O. Patino
Affiliation:
Departamento de Pós Graduação em Zootecnia, Universidade Federal do Rio Grande do Sul (UFRGS; Av. Bento Gonçalves, 7712, CEP 91540-000, Porto Alegre, RS), Brazil
F. S. Medeiros
Affiliation:
Brazilian Angus Association, General Manager of Certified Angus Beef (Largo Viasconde Cairú, 12, CEP 90030-110, Porto Alegre, RS), Brazil
C. H. Pereira*
Affiliation:
Departamento de Pós Graduação em Zootecnia, Universidade Federal do Rio Grande do Sul (UFRGS; Av. Bento Gonçalves, 7712, CEP 91540-000, Porto Alegre, RS), Brazil Department of Animal Science, North Dakota State University (NDSU Dept 7630 PO Box 6050, Fargo, ND), USA
K. C. Swanson
Affiliation:
Department of Animal Science, North Dakota State University (NDSU Dept 7630 PO Box 6050, Fargo, ND), USA
C. McManus
Affiliation:
Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília (UnB; Campus Universitário Darcy Ribeiro, CEP 70910-900, Brasília, DF), Brazil
*
†E-mail: carol_hpe@hotmail.com
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Abstract

Thirty Aberdeen Angus crossbred steers (281±16 kg) were used to test the effect of finishing feeding system on growth performance, meat quality and fatty acid (FA) profile in intramuscular fat. Steers were fed in confinement (forage:concentrate ratio of 50 : 50; DM basis) or with different levels of energy supplementation (0, 0.4, 0.8 and 1.2% BW) at pasture (Avena strigosa Schreb and Lolium multiflorum L.). There were no differences between treatments for ADG (average=1.60 kg/day), hot carcass weight (HCW) (average=229 kg) and subcutaneous fat depth (average=3 mm). Dressing % (P=0.06; tendency) and carcass ADG (P=0.02) linearly increased with level of supplementation for pasture steers. No differences were observed between treatments for tenderness, marbling, pH, color b*, or cooking loss and drip loss in samples of Longissimus dorsi. However L* increased linearly (P=0.05) with level of supplementation. The concentrations of myristic, palmitic, estearic and linoleic FA did not differ among treatments. The concentration of n-3 FA increased (P<0.001) in steers at pasture compared with confinement, but n-6 FA concentrations did not differ between feeding system. Supplementation up to 0.4% BW increase (P<0.001) conjugated linoleic acid (CLA) and linolenic FA concentrations in intramuscular fat when compared with confinement. The level of supplementation on pasture linearly decreased (P<0.001) n-3 and CLA and linearly increased (P=0.001) the n-6 : n-3 ratio. Finishing of steers grazing winter pasture with energy supplementation or in confinement fed a medium-concentrate diet did not affect meat quality (tenderness, marbling, parameter b* on the CIE L*a*b* scale, cooking and drip losses) except for a* and L*. However, intramuscular fat of animals finished at pasture with moderate level of supplementation compared to animals fed in confinement had greater concentration of CLA, linolenic, and n-3, and lower n-6 : n-3 in intramuscular fat.

Keywords

Confinementpasturebeef qualityn-3CLA
Type
Research Article
Information
animal , Volume 9 , Issue 6 , June 2015 , pp. 966 - 972
Copyright
© The Animal Consortium 2015 

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