نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار، دانشکده کشاورزی، دانشگاه یاسوج
2 دانشیار، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج
3 استادیار گروه پرورش طیور، دانشکده کشاورزی، دانشگاه تربیت مدرس
4 دانشجوی سابق کارشناسی ارشد، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
This study was performed to investigate the effect of dietary supplementation with ajwain essential oil (EO) and zilmax® on performance, carcass traits and serum biochemistry of chicks that were reared under different thermal programs. Another purpose of present study was to explore cold stress effects on above-mentioned parameters. This study were done according to a Complete Randomized Design with 8 treatment. For this purpose, Four dietary treatments (basal diet, dietary addition of ajwainEO at 150 and 450 ppm and zilmax® at 1.6 ppm) each with corresponding replicates (24 replicate; n=192; one male chick in each individual cage as a replicate) were fed to chicks at two different thermal programming envirnment. The results showed that at normal temperature envirnment, dietary addition of zilmax® and 450 ppm Ajwain EO, have increased plasma levels of triglycerides at the end of the growing phase (29 d) compared to control. Cold stress significantly decreased performance and ralitive weight of bursa (P>0.05). In conclusion, ajwain EO and and zilmax® as a feed additive had no beneficial effects on performance and could not ameliorate the negative effects of cold stress on chicks.
کلیدواژهها [English]