title: Assessment of the effects of supplementation with vitamin E on health and production of feedlot cattle using meta-analysis.
abstract: Delivery of supplemental antioxidant vitamins to cattle placed in feedlots might be expected to improve health and performance outcomes by reducing the effects of oxidative stress to which these cattle are presumably exposed. Meta-analytic procedures were used in this study to assess published experiments on the effects of vitamin E supplementation in feedlot cattle. The health outcome of morbidity, and the production outcomes of average daily gain (ADG) and gain to feed ratio (G:F), were analysed. The currently available data do not support the use of supplemental vitamin E administered as an injection (morbidity risk ratio=1.17; P=0.17). The authors conclude that supplemental dietary vitamin E should be fed within the [NRC, 1996. National Research Council. Nutrient Requirements of Beef Cattle, 7th ed. Natl. Acad. Press, Washington, DC] recommended range.
authors.affiliation: Australian Livestock Production Services, 102 Darling St., Cowra, NSW 2794, Australia. pcusack@nexon.com.au
authors.forename: Paul
authors.initials: P
authors.lastname: Cusack
authors.forename: Neil
authors.initials: N
authors.lastname: McMeniman
authors.forename: Ahmad
authors.initials: A
authors.lastname: Rabiee
authors.forename: Ian
authors.initials: I
authors.lastname: Lean
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000008:administration & dosage*; D002417:Cattle / Q000254:growth & development* / Q000502:physiology; D019587:Dietary Supplements; D002149:Energy Intake / Q000187:drug effects* / Q000502:physiology; D009751:Nutritional Requirements; D009752:Nutritional Status; D018384:Oxidative Stress / Q000187:drug effects; D014810:Vitamin E / Q000008:administration & dosage*; D015430:Weight Gain / Q000187:drug effects* / Q000502:physiology
chemical_list: D000975:Antioxidants; D014810:Vitamin E