CSIRO Publishing blank image blank image blank image blank imageBooksblank image blank image blank image blank imageJournalsblank image blank image blank image blank imageAbout Usblank image blank image blank image blank imageShopping Cartblank image blank image blank image You are here: Journals > Crop and Pasture Science   
Crop and Pasture Science
Journal Banner
  Plant sciences, sustainable farming systems and food quality
blank image Search
blank image blank image
blank image
  Advanced Search

Journal Home
About the Journal
Editorial Structure
Online Early
Current Issue
Just Accepted
Virtual Issues
All Issues
Special Issues
Research Fronts
Farrer Reviews
Sample Issue
For Authors
General Information
Submit Article
Author Instructions
Open Access
For Referees
Referee Guidelines
Review an Article
Annual Referee Index
For Subscribers
Subscription Prices
Customer Service
Print Publication Dates
Library Recommendation

blue arrow e-Alerts
blank image
Subscribe to our Email Alert or RSS feeds for the latest journal papers.

red arrow Connect with us
blank image
facebook twitter logo LinkedIn

red arrow Farrer Reviews
blank image

Invited Farrer Review Series. More...

red arrow PrometheusWiki
blank image
Protocols in ecological and environmental plant physiology


Article << Previous     |     Next >>   Contents Vol 38(1)

Responses to nitrogen and maize supplements by young cattle offered a low-quality pasture hay

GJ Lee, DW Hennessy, JV Nolan and RA Leng

Australian Journal of Agricultural Research 38(1) 195 - 207
Published: 1987


Twenty-seven Hereford steers (227¦3 kg) were offered ad libitum low-quality grass pasture hay containing 4.3 g N/kg DM. These steers were offered one of three maize supplements (nil, 570 g/day crushed maize or 680 g/day whole maize) alone or with one of two nitrogen (N) supplements (1 12 g/day urea: 250 g/day molasses, or 800 g/day pelleted protein meals). The crushed maize, whole maize and protein meal supplements were calculated to be isoenergetic on a metabolisable energy basis, and the urea and protein meal supplements were isonitrogenous.Both urea and protein meal supplements increased the intakes of hay and total digestible organic matter (DOMI), but there was a significant interaction between maize and N supplements such that maize increased hay and DOM intakes when offered alone. Unsupplemented steers ate only 1.98 kg OM of hay/day, whereas N supplemented steers ate 3.96-4.40 kg OM/day, and those supplemented with crushed and whole maize alone ate 2.45 and 2.85 kg OM/day respectively. The intakes of hay by the urea and protein meal supplemented groups were not significantly different.Both N and maize supplements had positive effects on liveweight change (P < 0.01), with N having the largest effect. Steers supplemented with protein meal gained 210 g/day more than those offered urea (P < 0.05), although DOMI was only 110 g/day more, indicating an effect of protein on the efficiency of utilisation of absorbed nutrients.N supplements increased rumen ammonia concentrations from 10¦3.0 mg NH3-N/l in unsupplemented steers to 169¦ 19.3 and 105¦ 19.0 mg NH3-N/l in steers offered urea and protein meal respectively; there was a significant interaction between the form of N supplement and form of maize supplement (P < 0.05). Total volatile fatty acid concentrations in the rumen (65¦ 1.9 mM) did not differ significantly between supplements.Glucose entry rate was positively related to liveweight change and was increased by both the N supplements and whole maize. Glucose entry rate, adjusted for DOMI, was higher in protein meal supplemented steers than those receiving urea or no N supplement (P < 0.01), and these steers had the highest growth rate.Urea pool size, and synthesis rate in the body, were greater in steers given the urea and protein meal supplements (P < 0.05), but there were no significant differences in these measurements between urea and protein meal supplements.

Full text doi:10.1071/AR9870195

© CSIRO 1987

blank image
Subscriber Login

PDF (653 KB) $25
 Export Citation
Legal & Privacy | Contact Us | Help


© CSIRO 1996-2016