Register      Login
Crop and Pasture Science Crop and Pasture Science Society
Plant sciences, sustainable farming systems and food quality
RESEARCH ARTICLE

The effect of increased rectal temperature on nitrogen metabolism in Brahman cross and Shorthorn X Hereford steers fed on lucerne chaff

JE Vercoe

Australian Journal of Agricultural Research 20(3) 607 - 612
Published: 1969

Abstract

A study was made of the effect on nitrogen metabolism of increasing the rectal temperature of Brahman cross and British steers on controlled feed intake.

When the rectal temperature of the British steers was 1.3 °C higher than that of the Brahman cross steers, they excreted 13.5 g urinary nitrogen per day more than the Brahman cross. When the Brahman cross steers had a rectal temperature 1.3 °C higher than the British, they excreted 8.7 g urinary nitrogen per day more than the British steers. At the same nitrogen intake there was no significant breed difference in the increase in urinary nitrogen per degree rise in rectal temperature. Increasing the rectal temperature had a small effect on appetite but did not affect the apparent nitrogen digestibility; the concentration of nitrogen in the faecal dry matter was higher under the heat treatment.

The ambient temperature at which rectal temperatures were increased by 1.3 °C was about 31°C for the British steers and 45° for the Brahman cross steers. At the increased rectal temperature the Brahman cross steers drank significantly more water than the British steers although faecal and urinary water losses were similar.

https://doi.org/10.1071/AR9690607

© CSIRO 1969

Committee on Publication Ethics


Export Citation Get Permission

View Dimensions