日粮磷水平对线性回归法测定磷真消化率的影响

doi:10.11843/j.issn.0366-6964.2014.04.010

Abstract

Abstract:

The current study was conducted to investigate the effect of dietary phosphorus (P) levels on the true P digestibility (TPD) estimated by the regression method in soybean meal (SBM) for growing pigs.Forty-eight barrows with an average initial BW of (36.0±0.1) kg were allocated to 6 diets in a 2×3 factorial arrangement of 2 diet types (low P diet without corn supplementation or high P diet supplemented with 50.0% corn) and 3 SBM levels (13.0%，26.0% and 39.0%) by a randomized complete block design to study the effect of diet type (low P diet or high P diet) on the determination of TPD in SBM by the regression method.There were 8 replicates in a treatment group with 1 pig per replicate.The results showed that dietary P intake，fecal P output，digested P and retained P for growing pigs were increased linearly with increasing levels of SBM (P<0.01).Compared with the low P diet，pigs fed the high P diet increased dietary P intake，fecal P output，urinary P output，digested P and retained P (P<0.05).Using the regression method，the estimates of TPD in SBM for pigs fed the high P diet was 36.11%，which was lower than the determined value of 43.38% for pigs fed the low P diet (P<0.05).In conclusion，the estimated values of TPD in SBM were higher for pigs fed the semi-purified diet (low P diet) than that for pigs fed the practical diet (high P diet).Therefore，diet P levels should be considered when using the determined values of TPD in feed ingredients derived from pigs fed semi-purified diet by the regression method for diet formulation.

CLC Number:

S828
S816.71

LIU Jing-bo，YANG Yue-kui，HE Jian. Effect of Dietary Phosphorus Levels on the True Phosphorus Digestibility Estimated by the Linear Regression Method[J]. ACTA VETERINARIA ET ZOOTECHNICA SINICA, 2014, 45(4): 572-577.

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Effect of Dietary Phosphorus Levels on the True Phosphorus Digestibility Estimated by the Linear Regression Method

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