The Use of Urinary Creatinine-Nitrogen Ratios and Blood Urea Nitrogen as Indicators of Protein and Energy Nutrition in Bred Beef Cows

Authors

Lynn E. Jones, University of Nebraska-Lincoln

Date of this Version

1-1967

Document Type

Thesis

Citation

Thesis (M.S.)—University of Nebraska—Lincoln, 1967. Department of Animal Science.

Comments

Copyright 1967, the author. Used by permission.

Abstract

This research was conducted to evaluate the use of urinary creatinine/nitrogen (Cr/N) ratios and blood urea nitrogen (BUN) levels as indicators of protein and energy nutrition during the winter in bred beef cows.

Eight groups of Hereford cows were individually fed rations with different ratios of digestible protein (DP) to digestible energy (DE) at varying levels the last 112 days of gestation. Urine and blood samples were collected every 28 days during this time. Urinary Cr/N ratios were calculated by using the relationship of mg. creatinine per ml. of urine/mg. nitrogen per ml. of urine. The performance of the cows was recorded.

Advisor: Donald C. Clanton