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 & Pasture Science   
Crop & Pasture Science
Journal Banner
  Plant Sciences, Sustainable Farming Systems & Food Quality
blank image Search
blank image blank image
blank image
  Advanced Search

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

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 youtube

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     |         Contents Vol 54(9)

Replacement of limestone with calcite prill derived from underground water in diets for molted layer hens

J. R. Pluske and R. D. Anderson

Australian Journal of Agricultural Research 54(9) 933 - 935
Published: 19 September 2003


Two hundred and forty, approximately 100-week-old molted Hyline Grey layer birds were used to compare the efficacy of calcite (CaCO3) prill (derived from an underground water lime treatment process for the removal of hardness; hereafter referred to as 'calcite prill') or limestone ('control') added as supplementary sources of calcium (Ca) to layer diets. One hundred and twenty birds were allocated to each diet. The 120 birds derived from 8 pens, with each pen comprising 5 cages each of 3 birds (15 birds per pen). The 2 diets were formulated to provide equal amounts of nutrients and vitamins and minerals, with the calcite prill and limestone added to each diet at 70 g/kg. Diets were offered on an ad libitum basis for 5 weeks. Measurements of bird performance, egg production, and egg quality were determined on a weekly basis. There were no statistical differences (P > 0.05) between the 2 diets in any of the indices measured over the experimental period. The average hen day percent was 73.2% and 69.5% for calcite-prill-fed birds and control birds, respectively. The lack of differences in egg production, egg weights, and egg quality seen between birds fed calcite prill and those fed limestone suggests that the Ca in calcite prill has a bioavailability at least equal to that for Ca from limestone. In this regard, calcite prill would appear to be a suitable alternative to limestone in diets for layer birds of this age.

Keywords: layer hens, calcium, calcite, egg production, egg quality.

Full text doi:10.1071/AR03062

© CSIRO 2003

blank image >
PDF (151 KB) $25
 Export Citation
Subscriber Login

Legal & Privacy | Contact Us | Help


© CSIRO 1996-2014