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Effects of Dairy Biomass Protein on Ruminal Fermentation and Site and Extent of Nutrient Digestion by Lambs^1,2,

University of Missouri, Columbia 65211

Abstract

Twelve ruminally and abomasally cannulated lambs (27 ± 1.16 kg) and 16 intact lambs (28 ± 1.49 kg) were used in two trials to study the influence of dairy biomass (a cheese processing wash water sludge) as a protein source in medium-concentrate diets. In Trials 1 and 2, lambs were assigned to one of three concentrate diets containing 0, 10 or 20% biomass with an additional positive control diet in Trial 2. Biomass provided 27.4 and 52.7% of the CP in 10 and 20% biomass treatments, respectively. Diets were similar in N content and were fed at 3.5% of initial BW (as fed). Apparent ruminal OM and N digestibilities were lower (P < .10) in lambs receiving 20% biomass than in lambs fed 0 or 10% biomass. Postruminal N digestibility was higher (P < .10) for lambs fed 20% biomass. Apparent OM and N digestibilities in both trials were reduced (P < .10) in lambs receiving 20% biomass. The molar proportion of acetate in the rumen was higher (P < .10) in lambs receiving 10% biomass compared to lambs fed other treatments. Plasma urea N concentration (mg/dl) was higher (P < .10) at 3 and 9 h after feeding in lambs receiving 10 and 20% biomass compared with control lambs. Although N retention was unchanged, fecal N excretion was higher (P < .10) and urinary N excretion was lower (P < .10) in lambs consuming 10 and 20% biomass treatments. Non-ammonia N and feed N flow (g/d) were higher (P < .10) in abomasal contents of lambs consuming 20% biomass vs other dietary treatments but N digestibility was decreased. In conclusion, digestibility was decreased and site of N digestion was altered by feeding biomass.

¹ Journal Article No. 10699 of the Missouri Agric. Exp. Sta.

² Experimentation was supported by USDA Special Grant No. 85-CRSR-2-2548. Gratitude is expressed to Tom Clevenger, Jim Brown, Mike Tumbleson and Gene Zinn for their support of the experiment. The authors also are grateful to Shirley Miller, Cindy Moss and Lisa Gieseke for their laboratory assistance.

³ Present address: Dept. of Anim. and Range Sci., College of Agric., North Dakota State Univ., P.O. Box 5727, Fargo 58105-5727.

⁴ Dept. of Anim. Sci.

⁵ Oil Dri Corp. of America, 520 N. Michigan Avenue, Chicago, 0.60611.

⁶ Dept. of Dairy Sci.