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《Acta Zoonutrimenta Sinica》 1997-02
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EFFECT OF DIETARY PROTEIN LEVEL ON NITROGEN METABOLISM IN EARLY-WEANED PIGS

Dong Guozhong; Zhou Anguo; Yang Feng; Cken Kerong(Research Institute of Animal Nutrition, Sichuan Agricultural University, Yaan, 625014)  
Thirty crossbred pigs weaned at 28 i 2 days of age, weighing an average of 4. 5 kgbody weight, were used to investigate the effect of dietary crude protein(CP) lev-els(9. 7, 14. 9, 20. 4, 25. 7 and 31. 4 % ) on nitrogen(N) metabolism. The results showed:(1) A significant(P0. 05 or 0.01) positive correlation existed between the dietary CPlevel and the CP intake, CP apparent digestibility, digested CP intake and undigested CPintake, respectively. (2)The CP true digestibility was .not affected(P 0. 05) by the dietaryCP level. (3)Endogenous N in faeces was 0. 22g / d or 2. 6g / kg dry matter intake. (4)Therewas a significant (P0.05) positive correlation between the dietary CP level and thevolatile basic N(VBN) and ammonia N(AN) contents in colonic digesta, respectively. How-ever, the VBN and AN contents in cecal digesta were not affected(P 0.05) by the dietaryCP level. (5) The Plasma VBN and urea N contents were affected significantly(P0.05) bythe dietary CP level- However, the dietary CP level had no effect on the plasma AN content(P0. 05). The results indicate that with an increase of the dietary CP level, the true CPdigestibility remains constant, and the amount of proteins entering the large intestine in-creases. As a result, the protein putrefaction in colon intensifies and the contents ofN - containing metabolites in blood are increased.
【CateGory Index】: S816
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