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Effects of increasing level of corn distillers dried grains with solubles on intake, digestion, and ruminal fermentation in steers fed seventy percent concentrate diets.
- Source :
-
Journal of animal science [J Anim Sci] 2009 Sep; Vol. 87 (9), pp. 2906-12. Date of Electronic Publication: 2009 May 22. - Publication Year :
- 2009
-
Abstract
- Five ruminally and duodenally cannulated steers (500 +/- 5 kg of initial BW) were used in a 5 x 5 Latin square to evaluate effects of increasing level of corn distillers dried grains with solubles (DDGS) in growing diets (70% concentrate) on OM intake, site of digestion, ruminal fermentation, and microbial efficiency. Diets consisted of 30% grass hay, 6% concentrated separator by-product, 4% supplement, and 60% dry-rolled corn, sunflower meal, urea, or DDGS (DM basis). Treatments consisted of increasing DDGS at 0, 15, 30, 45, or 60% of diet DM replacing a combination of dry-rolled corn, sunflower meal, and urea. Diets were balanced for growing steers gaining 1.22 kg/d and included 0.25% (DM basis) chromic oxide as a digesta flow marker. Diets were offered to the steers for ad libitum intake each day (10% above the intake of the previous day). Each period consisted of 14 d for adaptation and 7 d for collections. Intake of OM responded quadratically (P = 0.004) with greatest intakes at 15% DDGS and least at 60% DDGS. No differences (P >or= 0.14) were observed in CP intake or duodenal flow of OM, CP, and NDF. Apparent and true ruminal OM digestibilities decreased (linear; P <or= 0.009) with increasing DDGS inclusion. Total tract CP digestibility increased (linear; P < 0.001) with increasing DDGS, but total tract OM digestibility was not different (P = 0.74). Microbial efficiency (g of microbial N/kg of OM truly fermented) was not affected (P = 0.22) by treatment. As DDGS increased, ruminal pH increased (linear; P = 0.004), whereas ammonia concentration remained unchanged (P = 0.42). Acetate proportions decreased (linear; P < 0.001) with increasing DDGS, whereas propionate and butyrate were not affected (P >or= 0.19). A cubic (P = 0.02) effect was observed for total ruminal fill (as is basis) with the greatest fill at 0% DDGS and the least fill at 45% inclusion. Replacing dry-rolled corn with up to 60% DDGS in 70% concentrate diets resulted in no adverse effects on total tract OM digestion, although OM intake was reduced at 60% DDGS inclusion.
- Subjects :
- Ammonia analysis
Animals
Cattle metabolism
Duodenum metabolism
Duodenum microbiology
Fatty Acids, Volatile analysis
Gastrointestinal Contents chemistry
Hydrogen-Ion Concentration
Male
Zea mays metabolism
Cattle physiology
Diet veterinary
Dietary Fiber administration & dosage
Digestion physiology
Eating physiology
Fermentation
Rumen metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1525-3163
- Volume :
- 87
- Issue :
- 9
- Database :
- MEDLINE
- Journal :
- Journal of animal science
- Publication Type :
- Academic Journal
- Accession number :
- 19465500
- Full Text :
- https://doi.org/10.2527/jas.2008-1712