| Tolerance of cattle to high dietary sulfur and effect of dietary cation-anion balance. | |
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MedLine Citation:
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PMID: 21383030 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The objective of this study was to determine if dietary cation-anion balance (DCAB) affects the concentration of S that can be tolerated by growing and finishing cattle without adversely affecting performance. Angus cross and Bradford steers (n = 114; average initial BW = 252.8 kg) were blocked by BW and breed, and randomly assigned within a block to treatment. The design was a 3 x 2 factorial with S (from NH(4)SO(4)) supplemented at 0, 0.15 or 0.30% of DM, and NaHCO(3) added at 0 or 1.0% of DM. Each treatment consisted of three pens containing five steers and one pen containing four steers. Steers were used in an 84-d growing study followed by a finishing study. A corn silage-based diet was fed during the growing study and a corn-based diet was fed during the finishing study. Steers were not randomized between experiments. Growing diets analyzed 0.12, 0.30, and 0.46% S, while finishing diets analyzed 0.13, 0.31, and 0.46% S for treatments supplemented with 0, 0.15, and 0.30% S, respectively. Increasing DCAB by approximately 15 mEq/100 g DM, by the addition of NaHCO(3,) did not affect performance during the growing or finishing studies. During the growing study DMI was not affected by dietary S. Steers fed diets containing 0.30% S had greater ADG (P = 0.02) and G:F (P = 0.01) than those receiving 0.46% S, but similar performance to steers fed 0.12% S. During the finishing study steers fed diets containing 0.46% S had lower ADG than steers fed 0.13 (P = 0.004) or 0.31% S (P = 0.07), while ADG did not differ (P = 0.18) among steers fed 0.13 and 0.31% S. Steers fed diets containing 0.31 (P = 0.01) or 0.46% S (P = 0.001) had lower DMI than controls, but G:F was not affected by S during the finishing study. Carcass characteristics did not differ among steers fed diets containing 0.13 and 0.31% S. Steers receiving diets containing 0.46% S had lower HCW (P = 0.001), quality (P = 0.02), and yield grades (P = 0.04) than steers receiving 0.13% S. Plasma Cu concentrations on d 101 of the finishing phase and liver Cu concentrations at harvest were higher (P ≤ 0.05) in control steers compared to those fed diets containing 0.31 or 0.46% S. This study indicates that steers fed growing diets can tolerate up to 0.46% S with minimum effects on performance. Finishing steers tolerated diets containing 0.31% S without adverse affects on ADG or G:F. However, 0.46% S greatly decreased ADG and DMI, and increasing DCAB did not prevent these depressions. |
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Authors:
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J W Spears; K E Lloyd; R S Fry |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-3-7 |
Journal Detail:
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Title: Journal of animal science Volume: - ISSN: 1525-3163 ISO Abbreviation: - Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-3-8 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8003002 Medline TA: J Anim Sci Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Animal Science and Interdepartmental Nutrition Program, North Carolina State University, Raleigh, NC 27695-7621. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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