|DAVILA EL RASSI, G|
Submitted to: Journal of Animal Science
Publication Type: Abstract Only
Publication Acceptance Date: 4/16/2009
Publication Date: 8/1/2009
Citation: Davila El Rassi, G., Banskalieva, V., Brown, M.A. 2009. Effect of breed and production system on the content of cis-9, trans-11 CLA in m. longissimus lumborum and m. Semimembranosus of lambs [abstract]. American Society of Animal Science Annual Meeting, July 12-16, 2009, Montreal, Quebec, Canada. Available on-line: http://adsa.asas.org/meetings/2009/abstracts/toc.htm
Interpretive Summary: Abstract only.
Technical Abstract: Fatty acid composition of meat animal tissues has significant human dietary implications. Katahdin (KK), Katahdin x Suffolk (KS), Suffolk x Katahdin (SK), and Suffolk (SS) wether lambs (n=24) born spring of 2007 were used to evaluate levels of Conjugated Linolcic Acid (C18:2c9t11) from longissimus lumborum (LL) and semimembranosus (SM) muscle in concentrate and forage-fed lambs. Lambs were weaned and grazed on bermudagrass pasture until the end of August. Concentrate lambs were moved to drylot and 3 lambs of each breed group were fed on a mixed grain ration (12% CP, 76% TDN) for 88 d while a contemporary group of forage-fed lambs remained on bermudagrass until late September and then were moved to drylot and fed wheat silage for 69 days. Lambs were harvested at the Food and Agricultural Products Center, Oklahoma State University and muscle tissues sampled for fatty acid analyses. Data were analyzed by least squares procedures with linear models including fixed effects of treatment (concentrate vs. forage-fed), sire breed, and dam breed, and all possible 2- and 3-factor interactions. There was little evidence of any interactions among fixed effects in these data. There was evidence (P < 0.05) of treatment differences in CLA proportion in LL with forage-fed lambs greater than concentrate-fed lambs. There was also evidence of direct breed effects in favor of Katahdin for CLA proportion in LL and SM lipids (P < 0.01) but little evidence of heterosis or maternal breed effects. Proportions of CLA in LL were greater in KK compared to KS (P < 0.10), SK (P < 0.05), and SS (P < 0.01). Proportions of CLA in SM were greater in KK compared to KS (P = 0.05), SK (P < 0.01), and SS (P < 0.01) and CLA in SM of KS and SK were greater than that of SS (P < 0.01 and P < 0.10, respectively). These results suggest that meat from Katahdin lambs is greater in CLA than meat from either crosses with Suffolk or purebred Suffolk and that meat from forage-fed lambs is greater in CLA concentration compared to meat from concentrate-fed lambs.