نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد، گروه علوم دامی، دانشکده کشاورزی و منابع طبیعی، دانشگاه گنبد کاووس، ایران.

2 استادیار،گروه علوم دامی، دانشکده کشاورزی و منابع طبیعی، دانشگاه گنبد کاووس، ایران.

3 استادیار ،گروه علوم دامی، دانشکده کشاورزی و منابع طبیعی، دانشگاه گنبد کاووس، ایران.

چکیده

این پژوهش به‌منظور مقایسه فراسنجه­های خونی و عملکرد پرواری بره­های نر سه تا چهار ماهه نژادهای زل و دالاق، و آمیخته آن­ها با نژاد رومانف در شرایط رطوبتی- حرارتی مختلف انجام گرفت. آزمایش با چهار تیمار و شش تکرار و به­مدت 84 روز از اواسط مردادماه تا اوایل آبان‌ماه انجام شد. براساس شاخص رطوبتی- حرارتی، بره­­ها تا هفته هشتم آزمایش تحت تنش حرارتی خیلی شدید و شدید و پس از آن در شرایط عدم تنش حرارتی قرار داشتند (به­ترتیب شاخص 25/6 و بالاتر از آن، 23/3 تا کم‏‌‏تر از 25/6 و کم‏‌‏تر از 22/2). در طی تنش حرارتی خیلی شدید، عملکرد تیمارها یکسان بود. در تنش حرارتی شدید عملکرد بره­های دالاق و آمیخته دالاق- رومانف بهتر از بره­های زل و آمیخته زل- رومانف بود (0/05> P). در شرایط عدم تنش، صفات عملکردی در آمیخته زل- رومانف کم‏‌‏تر از سایر نژادها بود (0/05> P). غلظت گلوکز و کلسترول خون در طی زمانی که بره­ها در معرض تنش حرارتی قرار داشتند کم‏‌‏تر از زمان عدم تنش بود ولی غلظت اوره خون در شرایط تنش حرارتی بیش‏‌‏تر شرایط عدم تنش بود (0/05>P). غلظت اسیدهای چرب غیر استریفه در میانه دوره یعنی هنگام تنش حرارتی شدید بیش‏‌‏تر از دوره تنش خیلی شدید و عدم تنش بود (0/05> P). براساس نتایج به­دست‌آمده بره­های نژاد دالاق عملکرد پرواری بالاتری نسبت به نژاد زل و آمیخته آن­ها با نژاد رومانف به­ویژه در شرایط تنش حرارتی خیلی شدید داشتند.

کلیدواژه‌ها

عنوان مقاله [English]

Blood parameters and fattening performance comparison of Zel and Dallagh male lambs breeds and their crossbred with Romanov breed in different thermal-humidity conditions

نویسندگان [English]

  • Hassan Lakzaie 1
  • Farzad Ghanbari 2
  • Javad Bayat Kouhsar 3
  • Ashoor Mohammad Gharehbash 2

1 Department of Animal Science, faculty of Agriculture and Natural Resources, Gonbad Kavous University, Gonbad, Iran

2 Department of Animal Science, faculty of Agriculture and natural Resources, Gonbad Kavous University, Gonbad Kavous, Iran

3 Department o Animal Science, Faculty of Agriculture and Natural Resources, Gonbad Kavous university, Gonbd Kavous, Iran

چکیده [English]

This research was conducted in order to compare the blood parameters and fattening performance of Zel and Dalagh breeds male lambs (three to four months old), and their crossbred with Romanov in different thermal-humidity conditions. Fattening trial was conducted in Gonbad kavous with four treatments and six replicates for 84 days from mid-August to early November. Based on the temperature-humiity index (THI), the lambs were under very severe and severe of heat stress up to 8th weeks of trial, followed by non-stress conditions (THI index of 25.6 and above that, 23.3 up to less than 25.6 and less than 22.2 respectively). In the very severe heat stress condition, the performance of treatments was the same. In the severe heat stress, the performance of Dallagh lambs and their crossbred with Romanov was better than Zel and Zel-Romanov crossbred (P<0.05). In un-stress conditions, performance traits in Zel Romanov crossbred was lower than other treatments (P<0.05). Glucose and cholesterol concentration were lower when the lambs were in heat stress condition than normal time (P<0.05). Unlike, blood urea concentration in heat stress condition was higher than lack of stress time (P<0.05). Concentrations of nonstratified fatty acids (NEFA) in the middle period of experiment, during severe heat stress, were higher than those of very severe and nonstress periods. In whole of fattening trial period, all of the breeds had lower performance than expected, indicating the effects of heat stress on them. Totally, Dalagh breed lams had better fattening performance than Zel and their crossbred with Romanov, especially under very severe heat stress condition.

کلیدواژه‌ها [English]

  • Blood parameters
  • Dalagh-Rmanov crossbred
  • fattening performance
  • heat stress
  • Zel-Ronamov crossbred
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