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http://dx.doi.org/10.5713/ajas.2004.1570

Effects of L-arginine on Endothelium Derived Factors and Cyclic Nucleotides in Broilers under Low Ambient Temperature  

Han, Bo (College of Veterinary Medicine, China Agricultural University)
Yoon, Soonseek (College of Veterinary Medicine, Seoul National University)
Han, Hongryul (College of Veterinary Medicine, Seoul National University)
Wang, Xiaolong (College of Veterinary Medicine, Nanjing Agricultural University)
Publication Information
Asian-Australasian Journal of Animal Sciences / v.17, no.11, 2004 , pp. 1570-1574 More about this Journal
Abstract
A flock of AA breed chickens were reared in peterstme brood-vait chamber and were provided with high energy pelleted feed. At 14 d of age, a total of 350 birds were randomly divided into 3 groups as follows: 100 birds were exposed to normal ambient temperature of 20$^{\circ}C$ for control group; 150 birds were exposed to lower ambient temperature of 11$^{\circ}C$ to induce ascites (treatment I); and another group of 100 birds were exposed to lower ambient temperature of 11$^{\circ}C$ and fed diet containing 1% L-arginine for ascitic prophylactic treatment (treatment II). Samples were collected from blood and abdominal fluid of chicken at 3, 4, 5, 6 and 7 wk of age subsequently, to analysis the contents of plasma endothelin (ET-1), angiotensin II (Ang II), cyclic adenosine monophosphate (cAMP), cyclic guanosine monophosphate (cGMP). The results indicated that the contents of cAMP, cGMP, and Ang II in reatment I and ascitic broilers were higher than the corresponding control group (p<0.01, p<0.05), ET-1 of preascitic broilers were control group (p<0.05), while there was an insignificant difference with later ascitic broilers. The contents of cAMP and cGMP in treatment II were higher than the treatment I and control groups (p<0.01, p<0.05), whereas, the contents of Ang II were gradually decreased compared to the control group (p<0.05), the contents of ET-1 were insignificantly different. On further analysis, the increased plasma Ang II at low ambient temperature condition in broilers made endothelium cell secretion of increased ET-1, cAMP, cGMP and decreased NO. Therefore, low temperature accelerated ascites syndrome in broilers. Supplemently L-arginine can decrease ET-1, and increase cAMP and cGMP. It is concluded that cAMP mediated in broilers pulmonary hypertension syndrome.
Keywords
Ascites in Broilers; cAMP; cGMP; Ang II; ET-1;
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