title: Effect of level and type of fat on subacute acidosis in cattle fed dry-rolled corn finishing diets.
abstract: Five experiments were conducted to determine the effect of fat addition to dry-rolled corn (DRC) finishing diets on subacute acidosis. In Exp. 1, five ruminally fistulated steers (410 +/- 12 kg BW) were used in a 5 x 5 Latin square design. Treatments consisted of 0, 2, 4, 6, or 8% tallow added to a 50% fine-ground corn: 50% dry-rolled wheat basal challenge diet and dosed intraruminally as an acidosis challenge. Area below pH 6 was determined to quantify the total decrease in ruminal pH over a 24-h period. Area below pH 6 responded quadratically (P < .05); greatest time below pH 6 occurred with diets containing 2, 4, and 6% tallow. In Exp. 2, six ruminally fistulated steers (527 +/- 47 kg BW) were used in a 6 x 6 Latin square design and intraruminally dosed with 0, 4, 6, or 8% tallow or 4 or 8% yellow grease added to a 50% fine-ground corn:50% dry-rolled wheat basal challenge diet. Area below pH 6 responded quadratically for both tallow (P = .10) and yellow grease (P < .05) and was greatest for steers dosed with 4% tallow or yellow grease and decreased as tallow or yellow grease increased from 4 to 8%. Experiment 3 was a metabolism study using six ruminally fistulated steers (469 +/- 68 kg BW) in a 6 x 6 Latin square design. Cattle were fed a DRC finishing diet containing 0, 4, 6, or 8% tallow or 4 or 8% yellow grease.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Department of Animal Science, University of Nebraska-Lincoln 68583-0908, USA.
authors.forename: C R
authors.initials: CR
authors.lastname: Krehbiel
authors.forename: R A
authors.initials: RA
authors.lastname: Stock
authors.forename: D H
authors.initials: DH
authors.lastname: Shain
authors.forename: C J
authors.initials: CJ
authors.lastname: Richards
authors.forename: G A
authors.initials: GA
authors.lastname: Ham
authors.forename: R A
authors.initials: RA
authors.lastname: McCoy
authors.forename: T J
authors.initials: TJ
authors.lastname: Klopfenstein
authors.forename: R A
authors.initials: RA
authors.lastname: Britton
authors.forename: R P
authors.initials: RP
authors.lastname: Huffman
mesh_terms: D000138:Acidosis / Q000378:metabolism / Q000503:physiopathology / Q000662:veterinary*; D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000378:metabolism / Q000503:physiopathology*; D004032:Diet / Q000592:standards / Q000662:veterinary; D004041:Dietary Fats / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D005223:Fats / Q000494:pharmacology; D005232:Fatty Acids, Volatile / Q000032:analysis / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D008297:Male; D012417:Rumen / Q000737:chemistry / Q000378:metabolism; D013213:Starch / Q000378:metabolism; D003313:Zea mays / Q000378:metabolism / Q000592:standards*
chemical_list: D004041:Dietary Fats; D005223:Fats; D005232:Fatty Acids, Volatile; D013213:Starch; C013698:tallow