| Influence of dietary methionine concentration on growth and nitrogen balance in weanling Quarter Horses. | |
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MedLine Citation:
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PMID: 21357445 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Twenty-four Quarter Horse weanlings (120 ± 10 d) were blocked by age into 4 groups (n = 6) for a 56-d trial to evaluate the influence of dietary Met concentration on growth and nitrogen balance. Weanling horses were housed by block and individually fed concentrates twice daily at 1.75% BW (as-fed). Weanling horses were randomly assigned to 1 of 4 concentrate treatments: basal (0.20 Met), basal + 0.03% Met (0.23 Met), basal + 0.07% Met (0.27 Met), and basal + 0.11% Met (0.31 Met). Diets were formulated to be isonitrogenous and isocaloric, and contained equal amounts of Lys and Thr. Coastal bermudagrass hay (Cynodon dactylon) was individually fed at 0.75% BW (as-fed). Growth measurements, BW, rump fat, and plasma were obtained every 7-d. The final 4-d consisted of total collection of urine and feces. Feed, fecal, and urine samples were analyzed for N content and N balance was calculated. Urine was analyzed for urea and ammonia concentrations. Plasma was analyzed for urea concentration. Grain, hay, and fecal samples were analyzed for nutrient composition. Data were analyzed using the PROC MIX procedure of SAS. Linear, quadratic, and cubic effects were tested in the form of contrasts. There was no influence of treatment on growth measurements, N balance, or urinary urea or ammonia. Intake of Lys and Thr did not differ among treatments. Methionine intake increased as expected with increasing Met inclusion in the diet (P < 0.01). Plasma urea nitrogen responded quadratically (P = 0.04) to treatment. An unexpected peak in PUN was observed with 0.27 Met. Results indicate future studies that can ensure Met as the only dietary variable are necessary to better explain the Met requirements of weanling horses. |
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Authors:
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K N Winsco; J A Coverdale; T A Wickersham; J L Shelton |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-2-25 |
Journal Detail:
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Title: Journal of animal science Volume: - ISSN: 1525-3163 ISO Abbreviation: - Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-3-1 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, Texas A&M University, College Station 77843. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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