PMID- 15144082
OWN - NLM
STAT- MEDLINE
DCOM- 20050228
LR  - 20170908
IS  - 0021-8812 (Print)
IS  - 0021-8812 (Linking)
VI  - 82
IP  - 5
DP  - 2004 May
TI  - Effects of supplemental rumen-protected conjugated linoleic acid or corn oil on 
      fatty acid composition of adipose tissues in beef cattle.
PG  - 1419-27
AB  - Thirty-six Angus x Hereford heifers (365 +/- 60 kg) were used to determine the 
      effects of supplemental dietary lipid sources on fatty acid composition of i.m., 
      perianal (p.a.), and s.c. lipid depots. Lipid was supplied to diets as either 
      corn oil or a rumen-protected conjugated linoleic acid (CLA) salt for two 
      specific treatment periods of either the final 32 or 60 d on feed. Following an 
      initial 56-d feeding period, heifers were fed one of three dietary treatments (DM 
      basis): 1) basal diet containing 88% concentrate and 12% grass hay (CON), 2) 
      basal diet plus 4% corn oil (OIL), or 3) basal diet plus 2% rumen-protected CLA 
      salt (RPCLA) containing 31% CLA. The trans-10, cis-12 CLA concentration was 
      greatest (P < 0.05) for heifers fed RPCLA and OIL diets and least (P < 0.05) for 
      CON, regardless of time on dietary treatment. Heifers fed supplemental RPCLA had 
      greater (P < 0.05) total CLA content than either CON- or OIL-fed heifers. Adipose 
      tissue concentration of trans-11 vaccenic acid (TVA) was less (P < 0.05) for CON 
      than OIL or RPCLA, which did not differ (P > 0.05). Percentages of C18:1 trans-10 
      were least (P < 0.05) in i.m. lipid compared with p.a. and s.c., which did not 
      differ (P > 0.05). Following 60 d of lipid supplementation, heifers fed OIL and 
      RPCLA had lower (P < 0.05) concentrations of oleic acid and total monounsaturated 
      fatty acids (MUFA) compared with CON. The ratio of cis-9, trans-11 CLA:TVA was 
      higher (P < 0.05) for heifers fed 60 vs. 32 d, but did not differ (P > 0.05) 
      between adipose depots. Feeding OIL increased (P < 0.05) adipose concentration of 
      C18:2 fatty acid, whereas feeding RPCLA increased (P < 0.05) total CLA isomers by 
      22%. Intramuscular lipid contained the lowest (P < 0.05) percentage of cis-9, 
      trans-11 CLA, total CLA, C18:1 cis-9, C18:1 trans-10, and TVA. Total CLA and 
      cis-9, trans-11 CLA isomers were increased (P < 0.05) in p.a. and s.c. adipose 
      depots, whereas i.m. adipose tissue contained increased (P < 0.05) amounts of 
      total PUFA. Results from this study indicate that short-term lipid 
      supplementation to feedlot cattle can increase adipose tissue CLA concentrations, 
      but only marginally (8.3 to 17.5%). Moreover, observed decreases in oleic acid 
      and total MUFA concentrations of adipose tissues from heifers fed rumen-protected 
      CLA or corn oil suggest that lipid supplementation may decrease delta9 desaturase 
      activity in adipose tissues, which in turn would lower the conversion of TVA to 
      cis-9, trans-11 CLA isomer.
FAU - Gillis, M H
AU  - Gillis MH
AD  - Department of Animal and Dairy Science, University of Georgia, Athens 30602-2771, 
      USA.
FAU - Duckett, S K
AU  - Duckett SK
FAU - Sackmann, J R
AU  - Sackmann JR
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - J Anim Sci
JT  - Journal of animal science
JID - 8003002
RN  - 0 (Dietary Fats)
RN  - 0 (Fatty Acids)
RN  - 0 (Linoleic Acids, Conjugated)
RN  - 8001-30-7 (Corn Oil)
RN  - EC 1.14.19.- (Fatty Acid Desaturases)
SB  - IM
MH  - Adipose Tissue/anatomy & histology/*chemistry/drug effects
MH  - Animals
MH  - Body Composition/drug effects/physiology
MH  - Cattle/anatomy & histology/*metabolism
MH  - Corn Oil/*pharmacology
MH  - Dietary Fats/pharmacology
MH  - Fatty Acid Desaturases/metabolism
MH  - Fatty Acids/*analysis
MH  - Female
MH  - Isomerism
MH  - Linoleic Acids, Conjugated/*pharmacology
MH  - Muscle, Skeletal/anatomy & histology/metabolism
MH  - Rumen/*metabolism
EDAT- 2004/05/18 05:00
MHDA- 2005/03/01 09:00
CRDT- 2004/05/18 05:00
PHST- 2004/05/18 05:00 [pubmed]
PHST- 2005/03/01 09:00 [medline]
PHST- 2004/05/18 05:00 [entrez]
AID - 10.2527/2004.8251419x [doi]
PST - ppublish
SO  - J Anim Sci. 2004 May;82(5):1419-27. doi: 10.2527/2004.8251419x.