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日粮真可消化磷水平对生长猪氮磷消化率和排泄量的影响 被引量:5

Effects of Dietary True Digestible Phosphorus Levels on the Digestibility and Output of Phosphorus and Nitrogen for Growing Pigs
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摘要 选用5头平均体重为27.86 kg健康三元(杜×长×大)杂交阉公猪,采用5×5拉丁方设计,以真可消化磷(True digestiblephosphorus,TdP)为指标,配制了5种日粮真可消化磷含量不同的生长猪试验日粮,并使其总钙与TdP的比例为2∶1,来研究日粮真可消化磷水平对氮、磷的消化率及其排泄量的影响。结果表明,在日粮真可消化磷含量低于0.26%时,日粮磷的真消化率随着日粮真可消化磷含量的上升而升高,当日粮真可消化磷含量超过0.26%后达到0.39%时,磷的真消化率陡然下降,由52.69%下降到49.56%。由试验结果可以推导出,当日粮真可消化磷含量在0.34%左右时日粮磷的真可消化率达到最高56.6%。但是各试验日粮之间磷的真消化率差异并不显著。当以g.kg-1 DMI为单位时,粪磷排泄量随着日粮磷摄入量的增加线性增加,线性方程为:y=0.493x+1.140 9,r2=0.957 4。x表示日粮磷的摄入量,g.kg-1,DMI(DryMatter Intake);y表示粪磷排泄量,g.kg-1,DMI。日粮5对应的粪磷排泄量极显著高于日粮1(P<0.001)、日粮2(P<0.001)、日粮3(P=0.001)和日粮4(P<0.001),试验日粮1、2、3和4之间没有显著差异。当以g.kg-1 feces DM为单位时,日粮5对应的粪磷排泄量最高(25.82),极显著高于日粮1(P<0.001)、日粮3(P=0.005)和日粮4(P<0.001),显著高于日粮2(P=0.021),日粮4对应的粪磷排泄量最低(21.28),除了显著低于日粮5以外,还显著低于日粮2(P=0.006)和日粮3(P=0.029)。日粮粗蛋白的平均表观消化率为81.6%,且各组之间受日粮真可消化磷含量的影响差异不显著(P=0.679 4),而氮的总排泄量平均为12.14 g.d-1,各组之间没有显著差异(P=0.259 6),氮的沉积率在66% ̄74%之间,各组之间差异也不显著,可见日粮真可消化磷水平并不影响氮的消化吸收利用。 5 Duroc × Landrace ×Yorkshire barrow were selected, with average initial body weight 27.86 kg. 5×5 Latin square design was used. Five experimental diets were designed with five true digestible phosphorus (TdP) levels, and the ratio of total calcium to TdP was 2:1. The results indicated that the true P digestibility increased with the increase of dietary TdP concentration when the dietary TdP concentration below 0.26%. When dietary TdP concentration increased from 0.26% to 0.39%, the true P digestibility dropped sharply, from 52.69% to 49.56%, The true P digestibility reached biggest value (56.6%) when dietary TdP concentration was 0.34%. But there was no significant difference among five diets. Based on DMI (Dry Matter Intake, g·kg^-1), fecal P excretion increased linearly with the increase of P input, and linear equation was y=0.493x+1. 140 9, r^2=0.957 4 (x was dietary P input (g· kg^-1 DMI), y was fecal P output (g· kg^-1 DMI)). The true P digestibility value of dietary 5 was significantly higher than the values of dietary 1, dietary2, dietary 3 and dietary 4 (P〈0.01), and there were no significant difference among dietary 1, dietary 2, dietary 3 and dietary 4. Based on feces DM (g· kg^-1), fecal P output was highest in dietary 5, higher than dietary 1, dietary 2, dietary 3 and dietary 4(P〈0.05). The fecal P output of dietary 4 was lowest, lower than dietary 2, dietary3 and dietary 5(P〈0.05).The average apparent crude protein digestibility and the average nitrogen output were 81.6% and 12.14 g·d^-1 respectively, with no significant difference among the groups. The retention of nitrogen was 66% -74% and there was no significant difference among the groups, indicating that the dietary phosphorus levels could not influence the digesting and absorption of nitrogen.
出处 《农业环境科学学报》 CAS CSCD 北大核心 2006年第5期1303-1312,共10页 Journal of Agro-Environment Science
基金 国家973项目(2004CB117502) 国家自然科学基金项目(30371038) 中国科学院海外杰出学者基金(2005-1-4) 中国科学院海外杰出学者基金(2005-1-7) 中国科学院知识创新工程重要方向项目(KSCX2-SW-323)
关键词 消化率 排泄量 生长猪 true digestible phosphorus nitrogen phosphorus digestibility output
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参考文献17

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