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- Title
Source of dietary lipid may modify the immune response in stressed feeder cattle.
- Authors
Farran, T. B.; Reinhardt, C. D.; Blasi, D. A.; Minton, J. E.; Elsasser, T. H.; Higgins, J. J.; Drouillard, J. S.
- Abstract
Five studies were conducted to evaluate the effects of lipid source on performance and health of stressed feeder cattle. A total of 332 heifers (195 ± 2.37 kg initial BW) in trial 1 and 336 heifers (206 ± 1.70 kg initial BW) in trial 2 were fed diets containing ground fiaxseed (FLAX), rolled full-fat soybeans (SOY), or tallow (TAL) at 13, 20, or 4%, respectively (DM basis). All diets were formulated to be isonitrogenous and isocaloric. The ADG and G:F for the first 7 d and for the entire feeding period were greater (P < 0.05) for TAL and FLAX than for SOY. Percentage of animals treated and retreated for bovine respiratory disease did not differ among dietary treatments. The FLAX treatment increased (P < 0.05) total n-3 PUFA concentrations in the plasma, whereas SOY increased (P < 0.05) plasma concentrations of total n-6 PUFA. In trial 3, 18 steers were individually fed diets containing TAL and 18 steers were fed a diet containing SOY (20% of DM). In trials 4 and 5, 18 steers were individually fed diets containing TAL and 18 steers were fed diets containing FLAX (12.9% of DM). On d 14 and 17 of study 3, 4, and 5, 16 steers from each dietary treatment were injected i.v. with Escherichia coli O55:B5 lipopolysaccharide (LPS), and 2 steers from each diet were injected with saline. Rectal temperatures after LPS challenge were lower (P < 0.05) for SOY and FLAX than for TAL, and plasma TNF was greater (P < 0.05) for SOY than for TAL. Serum haptoglobin and blood fibrinogen increased and white blood cell count decreased in response to LPS, but none of these variables was affected by treatment. Although this research failed to measure an effect of lipid source on feedlot morbidity or mortality, these studies indicate that altering the source and type of dietary fatty acids may modify the immune response in stressed feeder cattle and that performance may be hindered by feeding full-fat soybeans to receiving cattle.
- Subjects
RUMEN fermentation; PHYSIOLOGICAL stress; CATTLE; IMMUNE response; LIPIDS in nutrition; ANIMAL nutrition; ANIMAL feeding; BLOOD cells; FIBRINOGEN
- Publication
Journal of Animal Science, 2008, Vol 86, Issue 6, p1382
- ISSN
0021-8812
- Publication type
Article
- DOI
10.2527/jas.2007-0116