| Restriction of vitamin A and D in beef cattle finishing diets on feedlot performance and adipose accretion. | |
| | |
MedLine Citation:
|
PMID: 22178850 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
|
Feedlot producers often exceed NRC recommendations for vitamin A and D supplementation, however increased concentrations of these vitamins have been shown to limit adipocyte differentiation in vitro. A feedlot trial was conducted using 168 Angus crossbred steers (BW = 284 ± 0.4 kg) allotted to 24 pens. The experiment had a 2 × 2 factorial arrangement of treatments: no supplemental vitamin A or D (NAND), 3,750 IU vitamin A/kg dietary DM with no supplemental vitamin D (SAND), no supplemental vitamin A and 1,860 IU vitamin D/kg dietary DM (NASD), and 3,750 IU and 1,860 IU vitamin A and D/ kg dietary DM (SASD), respectively. Serum, liver, and intramuscular and subcutaneous adipose tissue retinol concentrations were decreased in (P < 0.001) in cattle fed the no supplemental vitamin A diets (NAND and NASD combined) compared with those consuming supplemental vitamin A (SAND and SASD combined) diets. In addition, intramuscular retinol concentration was 38% less than in the subcutaneous depot. Serum 25(OH)D(3) concentrations were reduced (P < 0.001) during the first 70 d when cattle were fed no supplemental vitamin D diets (NAND and SAND combined); however, liver 25(OH)D(3) concentrations remained unchanged (P > 0.10) through d 184. Serum and liver 25(OH)D(3) concentrations increased (P < 0.001) with vitamin D supplementation (NASD and SASD combined). The DMI, ADG, G:F, and morbidity were not affected (P > 0.10) by dietary concentration of vitamin A or D. There were vitamin A and D interactions (P < 0.03) for backfat thickness and USDA Yield grade. Cattle fed the NAND diet had greater (P < 0.03) Yield grades than other treatments due to greater (P < 0.005) 12(th) rib backfat thickness in NAND steers than the NASD and SAND steers. Vitamin D concentrations were attenuated and minimal carcass adiposity responses to vitamin D supplementation were observed. Feeding a diet without supplemental vitamin A increased (P < 0.05) Quality grades and marbling scores, and tended (P = 0.06) to increase ether extractable lipid of the LM. As retinol and 25(OH)D(3) concentrations in feedlot cattle declined as a result of a lack of dietary supplementation, adipose accretion increased resulting in elevated Quality and Yield grades. Withdrawal of supplemental vitamin A and/or D from the finishing diet of feedlot beef cattle had minimal impact carcass composition. |
| | |
Authors:
|
C L Pickworth; S C Loerch; F L Fluharty |
Publication Detail:
|
Type: JOURNAL ARTICLE Date: 2011-12-16 |
Journal Detail:
|
Title: Journal of animal science Volume: - ISSN: 1525-3163 ISO Abbreviation: - Publication Date: 2011 Dec |
Date Detail:
|
Created Date: 2011-12-19 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 8003002 Medline TA: J Anim Sci Country: - |
Other Details:
|
Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
|
Department of Animal Sciences, The Ohio State University, Wooster 44691. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Changes in protein abundance between tender and tough meat from bovine Longissimus thoracis muscle a...
Next Document: Defining desired genetic gains for rainbow trout breeding objective using analytic hierarchy process...