title: Nutrient intake and digestion as influenced by wash water solids as a protein source for lambs fed orchardgrass hay.
abstract: Two experiments were conducted with sheep fed orchardgrass hay plus one of four supplements to evaluate use of a cheese processing wash water solid (WWS) material as a protein supplement. In both trials, lambs were fed either a cornstarch control (0% WWS-N) or a protein supplement containing 25, 50 or 75% N from WWS (25, 50 or 75% WWS-N, respectively). The majority of the remaining protein was supplied by soybean meal (SBM). Trial 1 was a replicated 4 x 4 extra-period Latin square. Protein supplementation increased total tract NDF and N digestibilities (P less than .10) 13% and 29%, respectively, compared with the cornstarch control. Total tract N digestibility was depressed (P less than .10) when 75% WWS-N (71.5%) vs 25 or 50% WWS-N (75.9 and 75.9%, respectively) was fed. Total VFA were depressed (P less than .10) 6 and 9 h postfeeding in sheep fed 75% WWS-N compared with the control (78.3 and 74.6 mM vs 98.8 and 94.6 mM for 6 and 9 h, respectively). Two hours postfeeding, lambs fed control had lower (P less than .10) ruminal pH compared with lambs fed 25, 50 and 75% WWS-N (6.2 vs 6.4, 6.5 and 6.5, respectively). Ruminal ammonia concentrations were 5 to 10 mg/dl lower (P less than .10) at all times in control lambs. In Trial 2, a metabolism study, feeding 75% WWS-N resulted in lower N digestibility (P less than .10) than did feeding 25% and 50% WWS-N (47.2 vs 56.4 and 55.2%, respectively). Data suggest that up to 50% of the SBM-N in a protein supplement for wethers may be replaced by WWS-N without adversely altering nutrient digestibility, ruminal fermentation or N metabolism.
authors.affiliation: Dept. of Anim. Sci., University of Missouri, Columbia 65211.
authors.forename: T
authors.initials: T
authors.lastname: May
authors.forename: J E
authors.initials: JE
authors.lastname: Williams
authors.forename: J S
authors.initials: JS
authors.lastname: Caton
authors.forename: E E
authors.initials: EE
authors.lastname: Beaver
mesh_terms: D000821:Animal Feed; D000818:Animals; D002611:Cheese; D004043:Dietary Fiber / Q000008:administration & dosage / Q000378:metabolism; D004044:Dietary Proteins / Q000378:metabolism*; D004063:Digestion; D004326:Drinking; D004435:Eating; D005285:Fermentation; D005511:Food Handling; D006863:Hydrogen-Ion Concentration; D008297:Male; D009753:Nutritive Value; D009994:Osmolar Concentration; D006109:Poaceae; D012417:Rumen / Q000737:chemistry / Q000378:metabolism*; D012756:Sheep / Q000378:metabolism*
chemical_list: D004043:Dietary Fiber; D004044:Dietary Proteins