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Calcium and phosphorus utilization in growing sheep supplemented with dicalcium phosphate

Published online by Cambridge University Press:  21 August 2012

R. S. DIAS ,
S. LÓPEZ ,
R. M. PATIÑO ,
T. S. SILVA ,
J. C. SILVA FILHO ,
D. M. S. S. VITTI ,
M. R. S. R. PEÇANHA ,
E. KEBREAB  and
J. FRANCE
R. S. DIAS
Affiliation:
Centre for Nutrition Modelling, Department of Animal and Poultry Science, University of Guelph, Guelph, ON, N1 G 2W1, Canada
S. LÓPEZ*
Affiliation:
Instituto de Ganadería de Montaña, Universidad de León – Consejo Superior de Investigaciones Científicas, Departamento de Producción Animal, Universidad de León, 24071 León, Spain
R. M. PATIÑO
Affiliation:
Facultad de Ciencias Agropecuarias, Universidad de Sucre, Carrera 28 5-267, Sincelejo, Sucre, Colombia
T. S. SILVA
Affiliation:
Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, CEP 13400-970, Piracicaba, SP, Brazil
J. C. SILVA FILHO
Affiliation:
Departamento de Zootecnia, Universidade Federal de Lavras, CEP 37200-000, Lavras, MG, Brazil
D. M. S. S. VITTI
Affiliation:
Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, CEP 13400-970, Piracicaba, SP, Brazil
M. R. S. R. PEÇANHA
Affiliation:
Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, CEP 13400-970, Piracicaba, SP, Brazil
E. KEBREAB
Affiliation:
Department of Animal Science, University of California, Davis, CA 95616, USA
J. FRANCE
Affiliation:
Centre for Nutrition Modelling, Department of Animal and Poultry Science, University of Guelph, Guelph, ON, N1 G 2W1, Canada
*
*To whom all correspondence should be addressed. Email: [email protected]
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Summary

The objective of the current study was to evaluate the utilization of calcium (Ca) and phosphorus (P) in growing sheep consuming increasing amounts of dicalcium phosphate. Eighteen growing sheep, aged 8 months, were fed a basal diet supplemented with 0, 12·5 and 25 g of dicalcium phosphate/day. During the experiment, animals were injected intravenously with 7·4 MBq of 45Ca and 32P and samples of plasma, faeces and urine were subsequently taken daily for 1 week after injection. Rumen fluid was sampled on days 4–7 after injection. Specific radioactivity in plasma and in faeces were used to determine true absorption of Ca and P, whereas plasmatic and ruminal specific radio-activities were used to determine endogenous P flow into the rumen and turnover time of rumen P. Increasing dicalcium phosphate intake led to linear increases in faecal excretion of endogenous Ca and P (P<0·05), suggesting that surpluses of ingested Ca and P were voided through secretion to the gut. True absorption coefficients for 0, 12·5 and 25 g of dicalcium phosphate ingested daily were 0·54, 0·41 and 0·38 for Ca, and 0·66, 0·62 and 0·64 for P, respectively. Flows of endogenous P into the rumen increased linearly and ruminal turnover time of P decreased linearly (P<0·01) as P intake was increased. Concentrations of Ca and P in bone were not affected by the increased amounts of these minerals ingested (P<0·05). In conclusion, increasing ingestion of dicalcium phosphate increases faecal excretion of Ca and P, thus decreasing the efficiency of utilization of both minerals. Moreover, increasing levels of dietary P increased endogenous P excretion, contributing to the amount of P disposed of in the environment.

Type
Animal Research Papers
Information
The Journal of Agricultural Science , Volume 151 , Issue 3 , June 2013 , pp. 424 - 433
Copyright
Copyright © Cambridge University Press 2012 

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