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Effects of supplemental fat source on nutrient digestion and ruminal fermentation in steers.
J Anim Sci 2008; 86(3):640-50JA

Abstract

Five Holstein steers (235 kg of BW) fitted with ruminal, duodenal, and ileal cannulas were used in a 5 x 5 Latin square design experiment to determine the effects of supplemental fat source on site and extent of nutrient digestion and ruminal fermentation. Treatments were diets based on steam-flaked corn containing no supplemental fat (control) or 4% (DM basis) supplemental fat as tallow, dried full-fat corn germ (corn germ), corn oil, or flax oil. Fat supplementation decreased (P < 0.08) ruminal starch digestion but increased (P < 0.03) small intestinal starch digestion as a percentage of intake. Feeding corn germ decreased (P < 0.09) ruminal starch digestion and increased (P < 0.03) large intestinal starch digestion compared with steers fed corn oil. Large intestinal starch digestion was less (P < 0.04), and ruminal NDF digestion was greater (P < 0.09) for steers fed tallow compared with steers fed other fat sources. Small intestinal (P < 0.08) and total tract NDF digestibilities were greater (P < 0.02) for steers fed corn germ than for those fed corn oil. Feeding tallow increased total ruminal VFA (P < 0.03) and NH(3) (P < 0.07) concentrations compared with steers fed the other fat sources. Feeding corn germ led to a greater (P < 0.02) rate of ruminal liquid outflow compared with corn oil. A diet x hour interaction (P < 0.04) occurred for ruminal pH, with steers fed corn oil having the greatest ruminal pH 18 h after feeding, without differences at other time points. Fat supplementation increased (P < 0.09) ruminal concentrations of Fusobacterium necrophorum. Duodenal flow of C18:3n-3 was greater (P < 0.01) for steers fed flax oil compared with those fed corn oil. Feeding corn germ led to less (P < 0.01) ruminal biohydrogenation of fatty acids compared with corn oil. Steers fed tallow had greater small intestinal digestibility of C14:0 (P < 0.02) and C16:1 (P < 0.04) than steers fed the other fat sources. Fat supplementation decreased (P < 0.06) small intestinal digestibility of C18:0. Feeding corn germ decreased (P < 0.10) small intestinal digestibility of C18:1 compared with corn oil. It appears that source of supplemental fat can affect the site and extent of fatty acid and nutrient digestion in steers fed diets based on steam-flaked corn.

Authors+Show Affiliations

Department of Animal Sciences and Industry, Kansas State University, Manhattan 66506-1600, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

18156344

Citation

Montgomery, S P., et al. "Effects of Supplemental Fat Source On Nutrient Digestion and Ruminal Fermentation in Steers." Journal of Animal Science, vol. 86, no. 3, 2008, pp. 640-50.
Montgomery SP, Drouillard JS, Nagaraja TG, et al. Effects of supplemental fat source on nutrient digestion and ruminal fermentation in steers. J Anim Sci. 2008;86(3):640-50.
Montgomery, S. P., Drouillard, J. S., Nagaraja, T. G., Titgemeyer, E. C., & Sindt, J. J. (2008). Effects of supplemental fat source on nutrient digestion and ruminal fermentation in steers. Journal of Animal Science, 86(3), pp. 640-50.
Montgomery SP, et al. Effects of Supplemental Fat Source On Nutrient Digestion and Ruminal Fermentation in Steers. J Anim Sci. 2008;86(3):640-50. PubMed PMID: 18156344.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of supplemental fat source on nutrient digestion and ruminal fermentation in steers. AU - Montgomery,S P, AU - Drouillard,J S, AU - Nagaraja,T G, AU - Titgemeyer,E C, AU - Sindt,J J, Y1 - 2007/12/21/ PY - 2007/12/25/pubmed PY - 2008/11/4/medline PY - 2007/12/25/entrez SP - 640 EP - 50 JF - Journal of animal science JO - J. Anim. Sci. VL - 86 IS - 3 N2 - Five Holstein steers (235 kg of BW) fitted with ruminal, duodenal, and ileal cannulas were used in a 5 x 5 Latin square design experiment to determine the effects of supplemental fat source on site and extent of nutrient digestion and ruminal fermentation. Treatments were diets based on steam-flaked corn containing no supplemental fat (control) or 4% (DM basis) supplemental fat as tallow, dried full-fat corn germ (corn germ), corn oil, or flax oil. Fat supplementation decreased (P < 0.08) ruminal starch digestion but increased (P < 0.03) small intestinal starch digestion as a percentage of intake. Feeding corn germ decreased (P < 0.09) ruminal starch digestion and increased (P < 0.03) large intestinal starch digestion compared with steers fed corn oil. Large intestinal starch digestion was less (P < 0.04), and ruminal NDF digestion was greater (P < 0.09) for steers fed tallow compared with steers fed other fat sources. Small intestinal (P < 0.08) and total tract NDF digestibilities were greater (P < 0.02) for steers fed corn germ than for those fed corn oil. Feeding tallow increased total ruminal VFA (P < 0.03) and NH(3) (P < 0.07) concentrations compared with steers fed the other fat sources. Feeding corn germ led to a greater (P < 0.02) rate of ruminal liquid outflow compared with corn oil. A diet x hour interaction (P < 0.04) occurred for ruminal pH, with steers fed corn oil having the greatest ruminal pH 18 h after feeding, without differences at other time points. Fat supplementation increased (P < 0.09) ruminal concentrations of Fusobacterium necrophorum. Duodenal flow of C18:3n-3 was greater (P < 0.01) for steers fed flax oil compared with those fed corn oil. Feeding corn germ led to less (P < 0.01) ruminal biohydrogenation of fatty acids compared with corn oil. Steers fed tallow had greater small intestinal digestibility of C14:0 (P < 0.02) and C16:1 (P < 0.04) than steers fed the other fat sources. Fat supplementation decreased (P < 0.06) small intestinal digestibility of C18:0. Feeding corn germ decreased (P < 0.10) small intestinal digestibility of C18:1 compared with corn oil. It appears that source of supplemental fat can affect the site and extent of fatty acid and nutrient digestion in steers fed diets based on steam-flaked corn. SN - 1525-3163 UR - https://www.unboundmedicine.com/medline/citation/18156344/Effects_of_supplemental_fat_source_on_nutrient_digestion_and_ruminal_fermentation_in_steers_ L2 - https://academic.oup.com/jas/article-lookup/doi/10.2527/jas.2006-812 DB - PRIME DP - Unbound Medicine ER -