Journal of Food, Agriculture and Environment

Vol 8, Issue 3&4,2010
Online ISSN: 1459-0263
Print ISSN: 1459-0255

The effect of dietary P level on the digestibility and output of P and nitrogen


Y. G. Zhang 1, Weiming Jiang 1,2, Lihua Tao 2*

Recieved Date: 2010-08-07, Accepted Date: 2010-11-02


Five barrows (Duroc × Landrace × Yorkshire) with an average initial body weight of 27.9 kg were used in a 5 × 5 Latin square design to evaluate the effect of different dietary P levels on the digestibility and output of P and nitrogen. The experimental diets contained 5 true digestible P levels (from 0.16% to 0.39%), and the ratio of total calcium to true digestible P (TDP) was 2:1. The results indicated that the true digestibility of P increased (P<0.05) linearly with increasing dietary TDP level below 0.26%. The true P digestibility of dietary TDP level 0.39% (Diet 5) was lower (P<0.05) than dietary TDP level 0.26% (Diet 4). The true P digestibility was highest (56.6%) when dietary TDP was 0.34%. Expressed as g/kg DMI, fecal P output increased (P<0.05) linearly with increasing P input. On the basis of g/kg fecal DM, fecal P output was highest (P<0.05) for Diet 5 and lowest for Diet 4. The apparent digestibility of CP did not differ (P>0.05) among the five diets, the average nitrogen output of 12.14 g/d and nitrogen retention of 66% to 74% (P>0.05). These results suggest that there is no interaction between dietary P and CP protein levels. Therefore, dietary P levels may not affect the digestion and absorption of dietary nitrogen in growing pigs.


True digestible P, nitrogen, P, digestibility, output

Journal: Journal of Food, Agriculture and Environment
Year: 2010
Volume: 8
Issue: 3&4
Category: Agriculture
Pages: 348-355

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