Effects of Supplemental Japanese Pepper Seed on Thermoregulation, and Blood Monoamines in Heat Exposed Broiler Chicks
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Abstract
Background: This study was carried out to assess the effects of enriched feed with Japanese Pepper Seeds (1 and 2%) on plasma monoamine and thermoregulation in broilers.
Materials and Methods: A day old male broiler chicks were obtained from hatchery (Fukuda, Japan), and were kept in cages with floor of wire-mesh; 3 broilers in each cage. The surrounding heat was controlled at 30 ± 1 0C for three days in the beginning of experiment, and gently lowered to 26 ± 1 0C until broilers reached 11 days of age.
Findings: The study result indicated that after 6 days of feeding, their feed intake and body weight gain were not significantly different among groups of control and supplemented with Japanese pepper seeds. However, feed conversion ratio decreased significantly with feed of 1% Japanese pepper seeds against 2% in Japanese pepper seeds broilers (P<0.05). Subsequently, all groups were subjected to high heat at 38o C, for 3 hours with water but not feed. The tendency was in wing drop and panting during temperature exposure groups (P>0.05). With acute heat stress, the temperature of all groups was elevated. The effects of time and Japanese pepper seeds were significant (P<0.05) in temperature exposed broilers. The interaction between time and Japanese pepper seeds were measured to reflect a tendency of significance (P<0.01). The affinities were measured in rectal temperature of control group and 2.0% group of Japanese pepper seeds broilers to reduce after 2h, although they kept advancing in 1% group of Japanese pepper seeds. There were no significant differences in the level of plasma monoamines in 5- HT, Ad and NA among groups (P>0.05), although the level of DA in plasma in 2% Japanese pepper seeds in broilers was lower than control one (P<0.05).
Conclusion: Present investigation recommend that Japanese pepper seeds affect thermoregulation through the catecholaminergic system in broilers. Nevertheless, it may have adverse effects under long period high temperature in chicks.
Keywords
Broiler, Japanese pepper seed, Thermoregulation, Plasma Monoamines, High temperature##plugins.themes.academic_pro.article.details##
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