New Zealand Journal of Agricultural Research abstracts
A model to predict kidney and liver cadmium concentrations in grazing
animals
P. LOGANATHAN
Fertilizer and Lime Research Centre
Massey University
Private Bag 11 222
Palmerston North, New Zealand
K. LOUIE
J. LEE*
AgResearch
Private Bag 11 008
Palmerston North, New Zealand
M. J. HEDLEY
Fertilizer and Lime Research Centre
Massey University
Private Bag 11 222
Palmerston North, New Zealand
A. H. C. ROBERTS
R. D. LONGHURST
AgResearch
Ruakura Agricultural Centre
Private Bag 3123
Hamilton, New Zealand
Abstract Cadmium (Cd) accumulation in the kidneys and liver of older
grazing animals is a major concern in New Zealand and Australian agriculture.
Use of phosphate fertilisers containing high Cd concentration is the main cause
of this accumulation. A simple mathematical model running in a user-friendly
computer package was developed to predict annual accumulation of Cd in kidneys
and liver of animals grazing pastures of known herbage Cd concentration and
phosphate fertiliser history. Results from the model showed that kidney and
liver Cd concentration of sheep were most sensitive to fertiliser Cd
concentration, moderately sensitive to pasture ingestion rate, and least
sensitive to soil ingestion rate.
The model was validated using kidney Cd data from a farmlet-scale
sheep-grazing trial. Kidney Cd concentrations predicted by the model were
strongly correlated with measured mean kidney Cd concentrations. The
relationship between the measured and predicted Cd concentrations is not
statistically different from the 1:1 relationship indicating that the model can
explain the variation in the measured mean kidney Cd concentration.
Keywords cadmium; pasture; grazing animals; modelling;
fertiliser; sheep
New Zealand Journal of Agricultural Research, 1999, Vol. 42: 423-432
0028-8233/99/4204-0423 $7.00/0 (c) The Royal Society of New Zealand
1999
PDF file of entire paper: medium quality (668K); (scanned from paper original: notes about this process)
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