Two studies were conducted to determinethe effects of diet and feed additive on growth andcarcass characteristics of lambs and cattle destined forall natural markets. In Exp. 1, 48 Dorset × Hampshirelambs (initial BW 29.4 ± 0.1 kg) were used in a randomizedcomplete block experiment to determine theeffects of Aspergillus oryzae extract, Amaferm (AMF)supplementation (1 g/d) in an 85% concentrate dieton growth and carcass characteristics. Lambs were allottedto 12 pens (4 lambs per pen), and blocked bysex and BW. Lambs were fed until the average BW ofeach pen reached a target BW (55.4 kg for wethers and50.0 kg for ewes), at which time the entire pen of lambswas slaughtered. Amaferm resulted in a greater (P =0.07) G:F. In Exp. 2, 168 crossbred steers (initial BW300 ± 0.7 kg) were used in a trial with a 3 × 2 factorialarrangement of treatments to examine the effectsof 0.5 g/d of Saccaromyces cervisiae boulardii CNCM1079-Levucell SB (LEV), or 3 g/d of AMF with 2 cornsources, dry whole-shelled corn or high moisture corn,on growth and carcass characteristics. Neither LEV norAMF improved (P > 0.10) carcass characteristics comparedwith control or non-feed-supplemented steers.Addition of LEV to high-concentrate, corn-based dietsdid not improve (P > 0.10) growth performanceof feedlot steers. However, addition of AMF to a dietcomposed of dry whole-shelled corn resulted in an improvement(P < 0.05) in G:F (0.208 vs. 0.194). Resultsindicate that at the amounts fed, AMF may improveG:F for lambs and steers fed dry corn-based finishingdiets.
All Science Journal Classification (ASJC) codes
- Food Science
- Animal Science and Zoology