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Rumen phosphorus metabolism in sheep

Published online by Cambridge University Press:  09 April 2009

R. S. DIAS ,
S. LOPEZ ,
T. SILVA ,
R. M. P. PARDO ,
J. C. SILVA FILHO ,
D. M. S. S. VITTI ,
E. KEBREAB  and
J. FRANCE
R. S. DIAS
Affiliation:
Centre for Nutrition Modelling, Department of Animal and Poultry Science, University of Guelph, Guelph, ONN1G 2W1, Canada Animal Nutrition Laboratory, Centro de Energia Nuclear na Agricultura, Caixa Postal 96, CEP 13400-970, Piracicaba, SP, Brazil
S. LOPEZ*
Affiliation:
Instituto de Ganadería de Montaña (IGM), Universidad de León – Consejo Superior de Investigaciones Científicas (CSIC), Departamento de Producción Animal, Universidad de León, E-24071, León, Spain
T. SILVA
Affiliation:
Animal Nutrition Laboratory, Centro de Energia Nuclear na Agricultura, Caixa Postal 96, CEP 13400-970, Piracicaba, SP, Brazil
R. M. P. PARDO
Affiliation:
Facultad de Ciencias Agropecuarias, University of Sucre, Carrera 28 5-267, Sincelejo, Sucre, Colombia
J. C. SILVA FILHO
Affiliation:
Animal Research Laboratory, Federal University of Lavras, CEP 37200-000, Lavras, MG, Brazil
D. M. S. S. VITTI
Affiliation:
Animal Nutrition Laboratory, Centro de Energia Nuclear na Agricultura, Caixa Postal 96, CEP 13400-970, Piracicaba, SP, Brazil
E. KEBREAB
Affiliation:
Department of Animal Science, University of Manitoba, Winnipeg, MBR3T 2N2, Canada
J. FRANCE
Affiliation:
Centre for Nutrition Modelling, Department of Animal and Poultry Science, University of Guelph, Guelph, ONN1G 2W1, Canada
*
*To whom all correspondence should be addressed. Email: s.lopez@unileon.es
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Summary

The objective of the present study was to examine the effect of the level of phosphorus (P) intake on ruminal P kinetics in sheep. Twelve Santa Inês male sheep (average body weight 36 kg) were fed a basal diet consisting of roughage (coast cross hay), concentrate mixture (cassava meal, soya bean meal and urea) and a mineral premix. The treatments consisted of the basal diet supplemented with 0, 1·5, 3 or 4·5 g/kg dry matter (DM) of mono-ammonium phosphate to provide increasing P levels representing treatments T0, T1, T2 and T3, respectively. The P content of experimental diets was 1·5; 2·0; 2·5 and 3·0 g P/kg DM, and considered highly deficient, deficient, adequate and in excess, respectively, compared with standard recommended allowances. Animals were injected with 32P and thereafter samples of blood were collected over 7 days, while samples of rumen fluid and saliva were collected 4 and 6 days after injection. Phosphorus intake affected P concentration in ruminal fluid, whereas P concentration in saliva was not affected. The values for P turnover time in the rumen were 1·42, 1·23, 1·18 and 1·04 days, whereas values of endogenous P entry into the rumen were 1·05, 1·37, 1·53 and 1·91 g/day for T0, T1, T2 and T3, respectively, both affected by P intake. The specific activity (SA) of P in saliva, rumen and plasma were also all affected by P intake. The relationship between saliva and rumen SA emphasizes that most endogenous P in the rumen came from saliva. The possibility of an extra P source besides saliva contributing to endogenous P in the rumen is discussed. It is concluded from the results that, regardless of P intake, the flow of endogenous P into the rumen contributes to ensure a minimum supply of this essential element, which may be important in matching the requirements of the rumen microbes.

Type
Modelling Animal Systems Paper
Information
The Journal of Agricultural Science , Volume 147 , Issue 4 , August 2009 , pp. 391 - 398
Copyright
Copyright © Cambridge University Press 2009

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