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Dislocated calcium alimentation for broilers
Summary Calcium is an essential nutrient for poultry, being involved in various digestive processes and of course of pivotal importance in bone development. It is generally recognized that broiler diets should contain 0.91.1% total Ca in order to satisfy the animals requirement and that this be coupled to digestible P in a ratio of 2:1. However, though Ca is an essential nutrient its presence in broiler diets results in a drastic reduction in the digestibility of phytateP and also impairs the value of microbial phytase (Selle et al., 2009). One obvious way to satisfy the animals Ca appetite but to minimize the adverse effects of Ca is to dislocate the provision of Ca from the diet and to offer instead a supplementary Ca source. Thus, this project will explore the usefulness of a novel Ca delivery strategy whereby supplemental Ca is removed from the diet and offered instead as grit for concomitant consumption. The effect of this strategy, as compared with conventional feeding, on Ca intake, leg health, FCR and the opportunity for feed cost reduction will be explored.
Program Chicken Meat
Research organisation The University of Sydney
Objective summary It is the purpose of this project to explore a novel Ca provision strategy where supplemental Ca will be removed from the diet and offered instead as a ‘choicefeeding’ grit. WoodGush & Kare (1966) identified that poultry have a specific appetite for Ca and ‘dislocated’ Ca alimentation has been attempted successfully in broilers previously (Joshua & Mueller, 1979) though not in the context of phytase and phytate interactions. Thus, this project will assess the usefulness of choicefeeding Ca in broiler production in conjunction with microbial phytase. Various aspects must be explored including equilibrating Ca intake, assessing leg health, FCR, optimum phytase dosing, Ca:P ratios, formulation of the Cadeficient diet, the Ca concentration of the supplemental source, litter moisture, economics, environmental impact, feeding behaviour and optimum positioning of the Ca source in the context of the rest of the diet. The ultimate objective is to establish whether the dislocation of Ca from the rest of the diet offers economic advantages for broiler production. This may be achieved by radical feed cost control in the basal (Ca deficient) diet via ‘space saving’, improved P and AA digestibility and also via improved performance and leg health.
Project Stage Closed
Project start date Friday, July 01, 2011
Project completion date Thursday, August 01, 2013
Journal articles from project Not Available
National priority An environmentally sustainable Australia
Rural priority Adoption of R&D
RIRDC goal CME-Increase the productivity and efficiency of chicken meat production
Principal researcher Jo-Ann Geist
Research manager Kylie Hewson
Admin contact Pearly Harumal