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http://dx.doi.org/10.5713/ajas.2007.1606

Effects of Dietary Dihydropyridine Supplementation on Laying Performance and Fat Metabolism of Laying Hens  

Zou, X.T. (Feed Science Institute, Zhejiang University)
Xu, Z.R. (Feed Science Institute, Zhejiang University)
Zhu, J.L. (Feed Science Institute, Zhejiang University)
Fang, X.J. (Feed Science Institute, Zhejiang University)
Jiang, J.F. (Feed Science Institute, Zhejiang University)
Publication Information
Asian-Australasian Journal of Animal Sciences / v.20, no.10, 2007 , pp. 1606-1611 More about this Journal
Abstract
The experiment was conducted to investigate the effects of dihydropyridine on laying performance and fat metabolism of laying hens. Five hundred and forty laying hens, 40 weeks old, were randomly allotted to three groups, each of which included four replicates of 45 hens. The groups were given a basal corn-soybean meal diet supplemented with 0, 150 mg/kg and 300 mg/kg dihydropyridine. Results showed that compared with the control group (0 mg/kg dihydropyridine), supplements of 150 and 300 mg/kg dihydropyridine increased egg production rate by 9.39% (p<0.01) and 12.97% (p<0.01), increased mean egg weight by 3% (p>0.05) and 4.8% (p>0.05), and improved feed efficiency by 9.54% (p<0.05) and 7.25% (p<0.05), respectively; The addition of 150 and 300 mg/kg dihydropyridine decreased percentage of abdominal fat by 35.4% (p<0.05) and 46.9% (p<0.05), decreased liver fat content by 32.4% (p<0.05) and 10.5% (p<0.05), increased HSL activity of abdominal fat by 39.64% (p<0.05) and 48.48% (p<0.05), increased HSL activity of liver by 9.4% (p>0.05) and 47.34% (p<0.05) and increased the content of cAMP in adenohypophysis by 14.67% (p<0.05) and 10.91% (p<0.05), respectively; The inclusion of 150 mg/kg dihydropyridine increased liver superoxide dismutase activity by 69.61% (p<0.05), and increased hepatic apoB concentration by 53.96% (p<0.05); The supplementation of 150 or 300 mg/kg dihydropyridine decreased malondialdehyde concentration of hepatic mitochondria by 30.90% (p<0.01) and 10.39% (p<0.05), respectively; Supplemented dihydropyridine had no significant effects on TG, Ch HDL-C and VLDL-C concentrations in serum; addition of 150 or 300 mg/kg dihydropyridine increased T3 levels in serum by 15.34% (p<0.05) and 11.88% (p<0.05) and decreased insulin concentration by 40.44% (p<0.05) and 54.37% (p<0.05), respectively. The results demonstrated that adding dihydropyridine had the tendency of improving very low density lipoprotein receptor (VLDLR) content in the ovary. It was concluded that dihydropyridine could improve laying performance and regulate the fat metabolism of laying hens and that 150 mg/kg dihydropyridine is the optimum dose for laying birds in practical conditions.
Keywords
Dihydropyridine; Laying Performance; Fat Metabolism; Laying Hens; TG (Trig1ycerides); Ch (Cholesterol); HDL-C (High Density Lipoprotein-Cholesterol); VLDL-C (Very Low Density Lipoprotein-Cholesterol); HSL (Hormone-sensitive Triglyceride Lipase); SOD (Superoxide Dismutase); MDA (Malondialdehyde); T3 (Triiodothyronine); T4 (Thyroxine); cAMP (Cyclic adenosine monophosphate); VTGR (Vitellogenin receptor);
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