title: Effects of twenty percent alkaline-treated corn stover without or with yucca extract on performance and nutrient mass balance of finishing steers fed modified distillers grains-based diets.
abstract: Two experiments were conducted with 192 steers each (during the winter [November to May] or summer [June to October]) to evaluate 3 diets with or without Yucca schidigera extract in a 3 × 2 factorial on steer growth performance and N mass balance. One factor was diet (DM basis): 1) 5% untreated corn stover, 51% corn, and 40% modified distillers grains plus solubles (MDGS; CON); 2) 20% calcium oxide-treated corn stover (CaO added at 5% of stover DM), 40% MDGS, and 36% corn (TRT); or 3) 20% untreated corn stover, 40% MDGS, and 36% corn (NONTRT). The other factor was dietary extract at 0 (NOYE) or 1.0 g/d per steer (YE). No interaction between diet and YE was detected (P > 0.51) for growth performance and carcass traits in winter and only for DMI in summer. Final BW, ADG, DMI, or G:F were not different (P ≥ 0.28) between cattle fed CON and TRT, whereas cattle fed NONTRT had lesser ADG, HCW, and G:F compared to CON and TRT in the winter experiment. During the summer, final BW and ADG tended to be greater (P ≥ 0.07) for CON compared to TRT. Cattle fed TRT had reduced (P < 0.01) G:F compared to CON. No difference was observed (P ≥ 0.36) between YE and NOYE in the winter experiment for performance or carcass traits. In the summer, cattle fed YE had greater (P < 0.02) HCW, ADG, and DMI compared to NOYE. In the summer experiment, cattle fed YE had greater (P < 0.01) N intake, N excretion, and amount of N lost (kg/steer) compared to NOYE, but no difference (P = 0.33) was observed for percentage of N volatilized (% of excretion). Diet had no effect (P > 0.18) on amount (kg/steer) or percentage of N volatized in the winter or summer. All diets had similar amounts (P > 0.13) of DM and OM removed from the pen surface in both summer and winter. Feeding CaO-treated corn stover as a partial grain replacement had no impact on performance in winter but decreased G:F in summer. Although high-fiber diets increased the amount of OM on pen surfaces, they did not impact N volatilized. Feeding a Y. schidigera extract did not affect N balance or manure characteristics.
authors.forename: J M
authors.initials: JM
authors.lastname: Johnson
authors.forename: A L
authors.initials: AL
authors.lastname: Shreck
authors.forename: B L
authors.initials: BL
authors.lastname: Nuttelman
authors.forename: D B
authors.initials: DB
authors.lastname: Burken
authors.forename: G E
authors.initials: GE
authors.lastname: Erickson
authors.forename: M J
authors.initials: MJ
authors.lastname: Rincker
authors.forename: M J
authors.initials: MJ
authors.lastname: Cecava
authors.forename: T J
authors.initials: TJ
authors.lastname: Klopfenstein
mesh_terms: D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena / Q000187:drug effects* / Q000502:physiology; D000818:Animals; D017610:Calcium Compounds / Q000494:pharmacology*; D002417:Cattle / Q000254:growth & development / Q000502:physiology*; D004032:Diet / Q000662:veterinary; D019587:Dietary Supplements; D002523:Edible Grain; D008297:Male; D008372:Manure / Q000032:analysis; D009584:Nitrogen / Q000378:metabolism; D010087:Oxides / Q000494:pharmacology*; D010936:Plant Extracts / Q000494:pharmacology*; D012621:Seasons; D027623:Yucca; D003313:Zea mays
chemical_list: D017610:Calcium Compounds; D008372:Manure; D010087:Oxides; D010936:Plant Extracts; C016538:lime; D009584:Nitrogen