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|Título: ||Genotype × environment interactions for fatty acid profiles in Bos indicus and Bos taurus finished on pasture or grain|
|Autor(es): ||Bressan, M. C.|
Rossato, L. V.
Rodrigues, E. C.
Alves, S. P.
Bessa, R. J. B.
Ramos, E. M.
Gama, L. T.
|Assunto: ||Beef cattle|
|Publicador: ||American Society of Animal Science|
|Data de publicação: ||19-Ago-2010|
|Referência: ||BRESSAN, M. C. et al. Genotype x environment interactions for fatty acid profiles in Bos indicus and Bos taurus finished on pasture or grain. Journal of Animal Science, [S.l.], v. 89, n. 1, p. 221-232, Jan. 2010.|
|Abstract: ||A study was conducted to characterize
lipid profiles in the M. longissimus thoracis of com-
mercial Brazilian beef and to assess how those profiles
are influenced by finishing system, genetic group, and
their interaction. Intramuscular fat (IMF) and fatty
acid (FA) profiles were determined in 160 bulls of the
Bos taurus (n = 75) and Bos indicus (n = 85) genet-
ic groups, finished on pasture (n = 46) or with grain
supplementation (n = 114) and slaughtered in a com-
mercial abattoir. Finishing system had a major impact
on the deposition of IMF, as well as on the concentra-
tion of SFA, PUFA, and their ratio, but genetic groups
showed important differences in the ability to convert
SFA into cis-9 MUFA and to convert 16:0 into 18:0.
When compared with pasture-finished animals, those
finished with grain had greater content of IMF and
SFA (P < 0.01), similar amounts of MUFA (P > 0.05),
and about one-half the amount of PUFA (P < 0.01). Except for MUFA, differences in FA profiles among fin-
ishing systems were mostly mediated through their ef-
fect on IMF, even though the relationship of IMF with
groups of FA differed among finishing systems. Under
grain finishing, B. taurus had less SFA and greater
MUFA than B. indicus (P < 0.01), but no differences
were observed in PUFA (P > 0.05). With pasture-fin-
ishing, no differences were observed among the 2 ge-
netic groups in SFA and MUFA (P > 0.05), but PUFA
were decreased in B. taurus (P < 0.01). When genetic
groups were compared in grain-finishing, B. taurus had
a decreased ability for elongation and B. indicus had
a decreased aptitude for desaturation of FA. On the
other hand, with pasture-finishing a greater deposition
of intermediate FA from ruminal biohydrogenation was
observed in B. indicus than in B. taurus. Overall, FA
profiles were affected more by finishing system in B.
indicus than in B. taurus.|
|Aparece nas coleções: ||DCA - Artigos publicados em periódicos|
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