Influence of Phosphorus Intake on Excretion and Blood Plasma and Saliva Concentrations of Phosphorus in Dairy Cows

Phosphorus (P) balance, and blood plasma P and saliva P concentrations were measured in multiparous dairy cows through two lactations and two dry periods. The cows were fed three amounts of P at either 100, 80 or 67% of the Dutch P recommendation, actually resulting in dietary P concentrations of 3....

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Bibliographic Details
Published in:Journal of dairy science 2002-10, Vol.85 (10), p.2642-2649
Main Authors: Valk, H., Šebek, L.B.J., Beynen, A.C.
Format: Article
Language:English
Subjects:
Animal productions
Animals
Biological and medical sciences
blood plasma
Cattle - metabolism
dairy cow
Digestion
Feces - chemistry
Female
Fundamental and applied biological sciences. Psychology
ID Lelystad, Institute for Animal Science and Health
ID-Lelystad, Instituut voor Dierhouderij en Diergezondheid
phosphorus
Phosphorus - analysis
Phosphorus - blood
Phosphorus, Dietary - administration & dosage
Saliva - chemistry
Terrestrial animal productions
Vertebrates
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Summary:Phosphorus (P) balance, and blood plasma P and saliva P concentrations were measured in multiparous dairy cows through two lactations and two dry periods. The cows were fed three amounts of P at either 100, 80 or 67% of the Dutch P recommendation, actually resulting in dietary P concentrations of 3.2 to 3.9, 2.6 to 2.9 and 2.2 to 2.6g P/kg dry matter during lactation for the three treatments, respectively. On the basis of plasma P values as low as 0.9 mmol/l and saliva P values as low as 5.1 mmol/l during the second lactation period within the experiment, the 67% group was considered to be deficient in P. By decreasing milk production, and thus lowering P losses with milk, P retention in the 67% group remained near zero. The P supply with the 80% ration was considered to be just sufficient. At high milk yield and marginal dietary P concentrations, plasma P and saliva P concentrations were decreased. The higher P intake in high-compared with low-producing cows resulted in a constant absolute fecal P excretion, due to the fact that the apparent P digestibility was raised with increasing milk yield. There was a direct relationship between milk P output and the percentage of apparent P digestibility for individual animals.
ISSN:0022-0302
1525-3198
DOI:10.3168/jds.S0022-0302(02)74349-X