Interaction between supplemental zinc oxide and zilpaterol hydrochloride on growth performance, carcass traits, and blood metabolites in feedlot steers1
| Autor: | James S. Drouillard, Raghavendra G. Amachawadi, K. A. Miller, C. L. Van Bibber-Krueger, Helen M. Scott, John M. Gonzalez |
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| Rok vydání: | 2017 |
| Předmět: |
Blood Glucose
Male 0301 basic medicine Trimethylsilyl Compounds media_common.quotation_subject Randomized block design chemistry.chemical_element Zinc Pun Random Allocation 03 medical and health sciences Animal science Genetics Animals Urea Drug Interactions Animal Husbandry Insulin-Like Growth Factor I media_common Plasma samples Body Weight 0402 animal and dairy science Zilpaterol hydrochloride 04 agricultural and veterinary sciences General Medicine Serum samples Animal Feed 040201 dairy & animal science Diet 030104 developmental biology chemistry Dietary Supplements Feedlot Cattle Female Animal Science and Zoology Zinc Oxide Once daily Ruminant Nutrition Abattoirs Food Science |
| Zdroj: | Journal of Animal Science. 95:5573-5583 |
| ISSN: | 1525-3163 0021-8812 |
| Popis: | Interactive effects of supplemental Zn and zilpaterol hydrochloride (ZH) were evaluated in feedlot steers (n = 40; 652 kg ± 14 initial BW) to determine their impact on feedlot performance, blood constituents, and carcass traits. The study was conducted as a randomized complete block design with a 2 × 2 factorial treatment arrangement. Steers were blocked by BW and randomly assigned to treatments. Factors consisted of supplemental Zn (60 or 300 mg/kg diet DM) and ZH (0 or 8.33 mg/kg) in the diets. For diets supplemented with 300 mg Zn/kg DM, 60 mg Zn/kg was supplemented as zinc sulfate and 240 mg Zn/kg was supplemented as zinc oxide, and the diet was fed for 24 d. Zilpaterol hydrochloride was fed for 21 d followed by a 3-d withdrawal. Cattle were housed in partially covered individual feeding pens equipped with automatic waterers and fence-line feed bunks and were fed once daily for ad libitum intake. Plasma samples were collected on d 0 and 21 to assess changes in Zn, plasma urea nitrogen (PUN), glucose, and lactate concentrations, and serum samples were collected on d 21 to assess IGF-1 concentration. On d 25, cattle were weighed and transported 450 km to a commercial abattoir for harvest; HCW and incidence of liver abscesses were recorded. Carcass data were collected after 36 h of refrigeration. Data were analyzed as a mixed model with Zn, ZH, and Zn × ZH as fixed effects; block as a random effect; and steer as the experimental unit. No interaction or effects of Zn or ZH were observed for IGF-1 concentration, plasma glucose, or lactate concentrations (P ≥ 0.25). No interaction between Zn and ZH was observed for PUN concentration, but PUN decreased with ZH (P < 0.01). There were no effects of ZH or Zn on ADG, DMI, final BW, feed efficiency, HCW, back fat, KPH, quality grade, or incidence of liver abscesses (P > 0.05). Zinc supplementation tended (P = 0.08) to improve the proportion of carcasses grading USDA Choice. Feeding ZH decreased yield grade (P = 0.05) and tended to increase LM area (P = 0.07). In conclusion, increasing dietary concentrations of Zn does not impact response to ZH, but feeding ZH altered circulating concentrations of PUN. |
| Databáze: | OpenAIRE |
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