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Title Body protein losses estimated by nitrogen balance and potassium-40 counting
Creator/Author Belyea, R.L. ; Babbitt, C.L. ; Sedgwick, H.T. ; Zinn, G.M.
Publication Date1986 Jul 01
OSTI IdentifierOSTI ID: 5006327
Other Number(s)CODEN: JDSCA
Resource TypeJournal Article
Resource RelationJ. Dairy Sci. ; Vol/Issue: 7
Research OrgUniv. of Missouri-Columbia
Subject553001 -- Agriculture & Food Technology-- Tracer Techniques-- (-1987); PROTEINS-- BODY COMPOSITION; CATTLE;DIET;LOSSES;MATERIAL BALANCE;NITROGEN;POTASSIUM 40;TRACER TECHNIQUES;WHOLE-BODY COUNTING
Related SubjectALKALI METAL ISOTOPES;ANIMALS;BETA DECAY RADIOISOTOPES;BETA-MINUS DECAY RADIOISOTOPES;BETA-PLUS DECAY RADIOISOTOPES;COUNTING TECHNIQUES;DOMESTIC ANIMALS;ELECTRON CAPTURE RADIOISOTOPES;ELEMENTS;ISOTOPE APPLICATIONS;ISOTOPES;LIGHT NUCLEI;MAMMALS;NONMETALS;NUCLEI;ODD-ODD NUCLEI;ORGANIC COMPOUNDS;POTASSIUM ISOTOPES;RADIOISOTOPES;RUMINANTS;VERTEBRATES;YEARS LIVING RADIOISOTOPES
Description/Abstract Body protein losses estimated from N balance were compared with those estimated by 40K counting.^Six nonlactating dairy cows were fed an adequate N diet for 7 wk, a low N diet for 9 wk, and a replete N diet for 3 wk.^The low N diet contained high cell wall grass hay plus ground corn, starch, and molasses.^Soybean meal was added to the low N diet to increase N in the adequate N and replete N diets.^Intake was measured daily.^Digestibilities, N balance, and body composition (estimated by 40K counting) were determined during each dietary regimen.^During low N treatment, hay dry matter intake declined 2 kg/d, and supplement increased about .5 kg/d.^Dry matter digestibility was not altered by N treatment.^Protein and acid detergent fiber digestibilities decreased from 40 and 36% during adequate N to 20 and 2%, respectively, during low N. Fecal and urinary N also declined when cows were fed the low N diet.^By the end of repletion, total intake, fiber, and protein digestibilities as well as N partition were similar to or exceeded those during adequate N intake.^Body protein (N) loss was estimated by N balance to be about 3 kg compared with 8 kg by 40K counting.^Body fat losses (32 kg) were large because of low energy digestibility and intake.^Seven kilograms of body fat were regained during repletion, but there was no change in body protein.
Country of PublicationUnited States
LanguageEnglish
FormatPages: 1817-1823
System Entry Date2001 May 13

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