title: Effects of chemically treated, recycled newsprint on feed intake and nutrient digestibility by growing lambs.
abstract: In situ experiments and two lamb digestion trials were conducted to evaluate the effects of chemically treating recycled newsprint (NP). Treatment of NP with 2% HCl (percentage of NP DM) followed by autoclaving for 4 h was most efficacious and was used in an in vivo digestion trial with 25 ram and wether lambs in a randomized complete block design (RCB). On a DM basis treatment diets were: 1) control, 95% alfalfa hay (AH); 2) 75% AH, 20% HCl-treated NP (HCl-NP); 3) 55% AH, 40% HCl-NP; 4) 75% AH, 20% untreated NP; and 5) 55% AH, 40% untreated NP on a DM basis. Lambs fed Treatments 2 and 3 had ad libitum DMI (1,043 and 1,036 g/d, respectively) similar to the DMI of those fed the control treatment (1,024 g/d); however, lambs fed Treatments 4 and 5 had lower (P < .05) ad libitum DMI (578 and 426 g/d, respectively) than lambs fed Treatments 1, 2, and 3. Apparent DM digestibilities were lower (P < .05) by lambs consuming Treatments 2, 3, 4, and 5 (52.6, 44.5, 52.0, and 48.2%, respectively) than by those consuming Treatment 1 (60.7%). Apparent OM, CP, NDF, and ADF digestibilities followed trends similar to DM. In the second digestion trial, 15 ram and wether lambs were used in a RCB to compare Treatments 1, 2, and 3. For this second digestion study, NP was treated with 4% HCl (percentage of NP DM), autoclaved for 4 h, and diets were fed at 2% of BW. As in Trial 1, apparent nutrient digestibilities decreased (P < .05) with increasing amounts of HCl-NP. Our results suggest that HCl-NP can be fed to sheep at 40% of the diet without a decrease in DMI; however, apparent nutrient digestibility decreases with increasing levels of HCl-NP.
authors.affiliation: Department of Animal Sciences, University of Illinois, Urbana 61801.
authors.forename: B W
authors.initials: BW
authors.lastname: Wolf
authors.forename: E C
authors.initials: EC
authors.lastname: Titgemeyer
authors.forename: L L
authors.initials: LL
authors.lastname: Berger
authors.forename: G C
authors.initials: GC
authors.lastname: Fahey
mesh_terms: D000821:Animal Feed; D000818:Animals; D002482:Cellulose / Q000008:administration & dosage; D004043:Dietary Fiber; D004063:Digestion; D004435:Eating; D006851:Hydrochloric Acid / Q000494:pharmacology; D008297:Male; D010209:Paper; D011897:Random Allocation; D012756:Sheep / Q000502:physiology*
chemical_list: D004043:Dietary Fiber; D002482:Cellulose; D006851:Hydrochloric Acid