Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/41652
Title: Rumen phosphorus metabolism in sheep
Keywords: Sheep - Food
Phosphorus in animal nutrition
Ruminants
Ovinos - Alimentação
Fósforo na nutrição animal
Rumiinantes
Issue Date: Aug-2009
Publisher: Cambridge University Press
Citation: DIAS, R. S. et al. Rumen phosphorus metabolism in sheep. The Journal of Agricultural Science, [S. I.], v. 147, n. 4, p. 391-398, Aug. 2009.
Abstract: 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.
URI: https://www.cambridge.org/core/journals/journal-of-agricultural-science/article/rumen-phosphorus-metabolism-in-sheep/F8CF97DA1DD8E3307DA2671C52F53600
http://repositorio.ufla.br/jspui/handle/1/41652
Appears in Collections:DZO - Artigos publicados em periódicos

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