Linked Life Data

10947090

Source:http://linkedlifedata.com/resource/pubmed/id/10947090

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SubjectPredicateObjectContext
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pubmed-article:10947090pubmed:dateCreated2000-9-12lld:pubmed
pubmed-article:10947090pubmed:abstractTextA feeding trial involving 160 crossbred steers (357 kg) and a metabolism trial involving eight Holstein steers (189 kg) cannulated in the rumen and proximal duodenum were conducted to evaluate the interaction of dietary Mg level (.18 vs .32%, DM basis) and supplemental fat (0% supplemental fat vs 4% tallow [T], yellow grease [YG], or griddle grease [GG]) on growth performance and NE value of the diet. Dietary Mg level did not influence (P > .10) growth performance. Daily weight gain was lower (11%, P < .05) for steers fed GG than for those fed YG. Supplemental fat decreased (5%, P < .10) DMI and increased (P < .05) gain efficiency (7%). There was a fat x Mg level interaction (P < .01) for dietary NE. The increase in dietary NEg with T and YG supplementation was similar (8.6 vs 8.0%) for diets containing .18 and .32% Mg. In contrast, the increase in dietary NEg with GG supplementation was 8.9% with .18% dietary Mg, but the NEg value of the diet did not increase when GG was added to diets with .32% dietary Mg. Dressing percentage was lower (1.5%, P < .1) and retail yield was greater (2.2%, P < .05) for steers fed GG- than for steers fed YG-supplemented diets. Increasing dietary Mg level increased kidney, pelvic, and heart fat (5.5%, P < .05). There was a fat x Mg level interaction (P < .1) for marbling score. With diets containing no supplemental fat, increasing dietary Mg decreased (15.2%) the marbling score, and with diets containing supplemental fat, increasing dietary Mg increased (7.2%) the marbling score. Fat supplementation decreased (P < .01) ruminal and total tract digestion of OM (10 and 3.5%, respectively) and NDF (37 and 17%, respectively). Supplemental fat did not affect (P > .10) Ca digestion but decreased (41.7%, P < .01) apparent Mg digestion. Increasing dietary Mg level increased (77.7%, P < .05) apparent Mg digestion. There were no treatment effects (P > .10) on postruminal fatty acid digestion. Fat supplementation decreased (17.3%, P < .01) the acetate:propionate molar ratio. Total ruminal protozoal counts were increased (12.7%, P < .05) by increasing dietary Mg level and decreased (12.9%, P < .05) by fat supplementation. We conclude that supplemental fats may depress Mg absorption. Increasing dietary magnesium levels beyond current recommendations may increase marbling scores in cattle fed fat-supplemented diets but may not affect growth performance or dietary NE. The NE value of fat is a predictable function of level of fat intake.lld:pubmed
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pubmed-article:10947090pubmed:issn0021-8812lld:pubmed
pubmed-article:10947090pubmed:authorpubmed-author:ZindR GRGlld:pubmed
pubmed-article:10947090pubmed:authorpubmed-author:RamirezJ EJElld:pubmed
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pubmed-article:10947090pubmed:volume78lld:pubmed
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pubmed-article:10947090pubmed:pagination2072-80lld:pubmed
pubmed-article:10947090pubmed:dateRevised2003-11-14lld:pubmed
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pubmed-article:10947090pubmed:year2000lld:pubmed
pubmed-article:10947090pubmed:articleTitleInteraction of dietary magnesium level on the feeding value of supplemental fat in finishing diets for feedlot steers.lld:pubmed
pubmed-article:10947090pubmed:affiliationDesert Research and Extension Center, University of California, El Centro 92243, USA.lld:pubmed
pubmed-article:10947090pubmed:publicationTypeJournal Articlelld:pubmed