Effects of supplemental protein on acid-base status and calcium metabolism of nonlactating Jersey cows.
The objective was to study effects of 11, 15, and 19% dietary CP on acid-base status, Ca balance, and metabolic responses to intravenous infusion of disodium EDTA. Dietary protein content was increased by supplementation of hydrolyzed feather meal and distillers dried grains with solubles to a concentrate combined with cottonseed hulls (40:60). Six nonlactating, nonpregnant multiparous Jersey cows (average 6.7 yr old) were used in two balanced 3 x 3 Latin squares with 24-d periods. Increasing supplemental CP decreased blood base excess, urinary titratable base, and net base excretion, but increased urinary ammonium excretion. Calcium excretion and balance were not affected by supplemental CP. Analysis to detect heterogeneity of regression showed that response of plasma EDTA-free Ca to EDTA infusion over time was not different among treatments. Increasing supplemental protein induced mild acidosis but did not affect Ca balance or responses to Ca removal from blood (via EDTA infusion) of non-lactating cows.
Wang
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Dairy Science Department, University of Florida, Gainesville 32611-0701.
Beede
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DK
D000136:Acid-Base Equilibrium; D000818:Animals; D002118:Calcium / Q000378:metabolism*; D002417:Cattle / Q000378:metabolism*; D004044:Dietary Proteins / Q000378:metabolism*; D004492:Edetic Acid / Q000008:administration & dosage / Q000494:pharmacology; D004573:Electrolytes / Q000378:metabolism; D005260:Female; D007262:Infusions, Intravenous; D011897:Random Allocation; D012044:Regression Analysis
D004044:Dietary Proteins; D004573:Electrolytes; D004492:Edetic Acid; D002118:Calcium