The fatty acid profile and retention time in the rumen of cattle grazing tropical grasses

Costa, D. F. A., Isherwood, P., Quigley, S. P., McLennan, S. R., De Souza, J., Gibbs, J., Sun, X. Q. and Poppi, D. P. (2013). The fatty acid profile and retention time in the rumen of cattle grazing tropical grasses. In: 2013 Annual Meeting Abstracts: American Dairy Science Association®, American Society of Animal Science. JAM 2013: Joint ADSA-ASAS Annual Meeting, Indianapolis, IN, U.S.A., (92-93). 8-12 July, 2013.

Author Costa, D. F. A.
Isherwood, P.
Quigley, S. P.
McLennan, S. R.
De Souza, J.
Gibbs, J.
Sun, X. Q.
Poppi, D. P.
Title of paper The fatty acid profile and retention time in the rumen of cattle grazing tropical grasses
Conference name JAM 2013: Joint ADSA-ASAS Annual Meeting
Conference location Indianapolis, IN, U.S.A.
Conference dates 8-12 July, 2013
Convener American Dairy Science Association (ADSA); American Society of Animal Science (ASAS)
Proceedings title 2013 Annual Meeting Abstracts: American Dairy Science Association┬«, American Society of Animal Science   Check publisher's open access policy
Journal name Journal of Animal Science   Check publisher's open access policy
Publication Year 2013
Sub-type Published abstract
ISSN 0021-8812
1525-3163
Volume 91
Issue E-Supp. 2
Start page 92
End page 93
Total pages 2
Language eng
Formatted Abstract/Summary
The objectives of this study were to examine the fatty acid (FA) profile in the rumen fluid (RF) and relate the extent of biohydrogenation (BH) to the retention time (RT) of fluid in the rumen. Four rumen cannulated steers (790 ± 17 kg BW) grazing pastures of C3 ryegrass Lolium multiflorum and C4 species, signal grass Brachiaria decumbens, stargrass Cynodon dactylon and speargrass Heteropogon contortus. Each pasture was grazed for 21d followed by 3d collection. On d 22 CrEDTA was used to estimate RT (182 mg Cr/100 kg BW injected via cannula) and RF samples collected at 0, 4, 8, 12, 16, 24, 28, 32 and 48 h after dosing for Cr analysis and at 0, 8 and 16h for FA profile by gas chromatography. One way model analysis was used for RT and repeated measures procedure for FA profile, both carried out using GLM procedure. Speargrass had a longer RT than ryegrass (8 vs. 11 h) while signal and stargrass grasses had intermediate values (10h) with the differences not expected to results in differences in extent of BH due to RT. Palmitic and stearic acids in RF were much higher than in forage plucked samples (PS) but all grasses had similar total saturated fatty acid (TSFA) with a greater degree of saturation for ryegrass. A higher CLAc9,t11 content in RF of steers grazing ryegrass resulted from the higher linolenic concentration in PS but linoleic concentration in RF was lower for those steers. Total unsaturated FA (TUFA) content of RF was reduced markedly compared with the TUFA of the forage with some small differences between forages.
Keyword Fatty acid
Tropical forage
Q-Index Code EX
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes This volume also published as Journal of Dairy Science 96(E-Supp. 1) (0022-0302; 1525-3198).

Document type: Conference Paper
Collection: School of Agriculture and Food Sciences
 
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Created: Tue, 18 Feb 2014, 17:18:31 EST by Dr Simon Quigley on behalf of School of Agriculture and Food Sciences