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http://dx.doi.org/10.5713/ajas.2012.12555

Effects of Dietary Lysine Levels on Apparent Nutrient Digestibility and Serum Amino Acid Absorption Mode in Growing Pigs  

Zeng, P.L. (Guangdong Provincial Key Laboratory of Agro-Animal Genomics and Molecular Breeding, Department of Animal Science, South China Agricultural University)
Yan, H.C. (Guangdong Provincial Key Laboratory of Agro-Animal Genomics and Molecular Breeding, Department of Animal Science, South China Agricultural University)
Wang, X.Q. (Guangdong Provincial Key Laboratory of Agro-Animal Genomics and Molecular Breeding, Department of Animal Science, South China Agricultural University)
Zhang, C.M. (Guangdong Provincial Key Laboratory of Agro-Animal Genomics and Molecular Breeding, Department of Animal Science, South China Agricultural University)
Zhu, C. (Guangdong Provincial Key Laboratory of Agro-Animal Genomics and Molecular Breeding, Department of Animal Science, South China Agricultural University)
Shu, G. (Guangdong Provincial Key Laboratory of Agro-Animal Genomics and Molecular Breeding, Department of Animal Science, South China Agricultural University)
Jiang, Q.Y. (Guangdong Provincial Key Laboratory of Agro-Animal Genomics and Molecular Breeding, Department of Animal Science, South China Agricultural University)
Publication Information
Asian-Australasian Journal of Animal Sciences / v.26, no.7, 2013 , pp. 1003-1011 More about this Journal
Abstract
Two experiments were conducted to determine the effects of different dietary lysine levels on the apparent nutrient digestibility, the serum amino acid (AA) concentration, and the biochemical parameters of the precaval and portal vein blood in growing pigs. In Experiment 1, 15 noncannulated pigs received diets with different lysine densities (0.65%, 0.95%, and 1.25% lysine) for 13 d. A total collection digestion test was performed, and blood samples were collected from the precaval vein at the end of the experiment. In Experiment 2, four cannulated pigs were fed the same diets of Experiment 1. The experiment used a self-control experimental design and was divided into three periods. On d 5 of each period, at 0.5 h before feeding and hourly up to 8 h after feeding, single blood samples were collected from catheters placed in the portal vein. In Experiment 1, some serum AAs (including lysine), serum urinary nitrogen (SUN), and total protein (TP) concentrations were significantly affected by the dietary lysine levels (p<0.05). Moreover, the 0.65% lysine treatment showed a significant lower apparent digestibility of gross energy, dry matter, crude protein, and phosphorus than the other treatments (p<0.05). In Experiment 2, serum lysine, histidine, phenylalanine, threonine, valine, isoleucine (p = 0.0588), triglyceride, and SUN (p = 0.0572) concentrations were significantly affected by the dietary lysine levels (p<0.05). Additionally, almost all of the determined serum AA and total AA concentrations reached their lowest values at 0.5 h before feeding and their highest values at 2 h after feeding (p<0.05). These findings indicate that the greatest absorption of AA occurred at 2 h after feeding and that the dynamic profile of serum AA is affected by the dietary lysine levels. Moreover, when the dietary lysine content was 0.95%, the growing pigs achieved a better nutrient digestibility and serum metabolites levels.
Keywords
Lysine; Nutrient Digestibility; Amino Acid; Biochemical Parameter; Pig;
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