Effect of Dietary Crude Protein Levels on Nitrogen Excretion and Growth Performance in Finishing Pigs

doi:10.3321/j.issn:1000-7091.2006.z1.040

Abstract

Abstract: Two experiments were conducted with finishing pigs to determine the effects of crude protein (CP) levels on growth performance, N and energy balance. Dietary CP levels were 16.1%, 14.3%, 13.3%, 12.4%, or 11.7%. 80 three-line crossbred pigs (Duroc×Landrace×Yorkshine), with initial BW of (51.86±3.11) kg, were allocated to five treatments. Each treatment was sixteen pigs with four repeats in a performance trial. Five barrows (Duroc×Landrace×Yorkshine), with initial BW of (62.96±2.04) kg, were used according to a 5×5 Latin square design in a balance trial. Fecal, urinary, total N excretion, N absorption and N retention (g/d) decreased with decreasing dietary CP level (P<0.01). However, DE and ME/GE(%) increased with decreasing dietary CP level (P<0.05). Dietary CP intake affected (P<0.01) ADG, ADFI, feed efficiency, and plasma concentrations of urea N. Dietary protein concentration reduced from 16.1% to 13.3% can dramatically reduce N excretion with little decrease in growth performance.

Key words: Amino acids, Crude protein, Growth performance, Finishing pigs

CLC Number:

S852.23

DENG Dun, LI Tie-jun, HUANG Rui-lin, YIN Yu-long, YIN Qi-zhi, HE Xia-yang. Effect of Dietary Crude Protein Levels on Nitrogen Excretion and Growth Performance in Finishing Pigs[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2006, 21(S1): 166-171. doi: 10.3321/j.issn:1000-7091.2006.z1.040.

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