skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Body protein losses estimated by nitrogen balance and potassium-40 counting

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 3more » 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.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Univ. of Missouri-Columbia
OSTI Identifier:
5006327
Resource Type:
Journal Article
Journal Name:
J. Dairy Sci.; (United States)
Additional Journal Information:
Journal Volume: 7
Country of Publication:
United States
Language:
English
Subject:
60 APPLIED LIFE SCIENCES; PROTEINS; BODY COMPOSITION; CATTLE; DIET; LOSSES; MATERIAL BALANCE; NITROGEN; POTASSIUM 40; TRACER TECHNIQUES; WHOLE-BODY COUNTING; ALKALI 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; 553001* - Agriculture & Food Technology- Tracer Techniques- (-1987)

Citation Formats

Belyea, R L, Babbitt, C L, Sedgwick, H T, and Zinn, G M. Body protein losses estimated by nitrogen balance and potassium-40 counting. United States: N. p., 1986. Web. doi:10.3168/jds.S0022-0302(86)80607-5.
Belyea, R L, Babbitt, C L, Sedgwick, H T, & Zinn, G M. Body protein losses estimated by nitrogen balance and potassium-40 counting. United States. doi:10.3168/jds.S0022-0302(86)80607-5.
Belyea, R L, Babbitt, C L, Sedgwick, H T, and Zinn, G M. Tue . "Body protein losses estimated by nitrogen balance and potassium-40 counting". United States. doi:10.3168/jds.S0022-0302(86)80607-5.
@article{osti_5006327,
title = {Body protein losses estimated by nitrogen balance and potassium-40 counting},
author = {Belyea, R L and Babbitt, C L and Sedgwick, H T and Zinn, G M},
abstractNote = {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.},
doi = {10.3168/jds.S0022-0302(86)80607-5},
journal = {J. Dairy Sci.; (United States)},
number = ,
volume = 7,
place = {United States},
year = {1986},
month = {7}
}