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Evaluation of ammoniated wheat straw during a receiving and growing period for beef cattle11Contribution 15-342-J from the Kansas Agricultural Experiment Station, Manhattan.
- Schlegel, E.R., Montgomery, S.P., Waggoner, J.W., Vahl, C.I., Titgemeyer, E.C., Hollenbeck, W.R., Blasi, D.A.
- The Professional animal scientists 2016 v.32 no.3 pp. 295-301
- Holstein, agricultural experiment stations, alfalfa hay, beef, beef cattle, calves, corn gluten, crossbreds, digestibility, experimental diets, growth performance, heifers, pH, steers, wheat straw, Kansas
- Two experiments were conducted to determine the effects of including ammoniated wheat straw in diets for beef cattle on growth performance and digestibility. Treatments consisted of diets containing 70% (DM basis) concentrate containing 40% (DM basis) wet corn gluten feed with 30% (DM basis) roughage from wheat straw (STRW), anhydrous ammonia–treated wheat straw (AMMN), or a 50:50 prairie hay and alfalfa hay blend (CONT). Experiment 1 used 288 crossbred steer calves (271 ± 28 kg) in a randomized complete block design in which steers were fed their experimental diets for 56 d. Final BW, ADG, and G:F were greater for calves fed CONT than for those fed either STRW or AMMN (P < 0.05). Experiment 2 used 6 ruminally fistulated Holstein heifers (288 kg) in a 3 × 3 Latin square design. Heifers fed CONT consumed less (P < 0.05) DM, OM, and ADF compared with those fed AMMN and STRW. Feeding heifers CONT improved (P < 0.05) digestibility of DM and OM but decreased (P < 0.05) digestibility of ADF. Ruminal pH was lowest (P < 0.05) for heifers fed CONT. The results of this experiment suggest that wheat straw and ammoniated wheat straw are equivalent roughage sources but inferior to a 50:50 blend of alfalfa hay and prairie hay when fed to growing calves at 30% of the dietary DM.