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مطالعه ارتباط غلظت پلاسمایی هورمون‌های لپتین و تستوسترون خون در مراحل قبل و بعد از پیوبرتی جوانه گاوهای نر

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استاد، گروه علوم دامی، دانشکده علوم دامی و صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان، ملاثانی، اهواز، ایران

2 دانشجوی سابق کارشناسی ارشد، گروه علوم دامی، دانشکده علوم دامی و صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان، ملاثانی، اهواز، ایران

3 دانشیار، گروه علوم دامی، دانشکده علوم دامی و صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان، ملاثانی، اهواز، ایران

4 استاد، گروه علوم دامی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج، ایران

5 گروه علوم دامی، دانشکده علوم دامی و صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان، ملاثانی، اهواز، ایران.

6 دانشجوی دکتری فیزیولوژی دام، گروه علوم دامی، دانشکده علوم دامی و صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان، ملاثانی، اهواز، ایران

چکیده

هدف پژوهش حاضر مطالعه ارتباط بین غلظت پلاسمای هورمون‌های لپتین و تستوسترون خون در مراحل قبل و بعد از پیوبرتی بود. برای این منظور تعداد هشت راس گوساله نر نجدی با میانگین سنی هفت ماه استفاده گردید. از این گوساله‌ها سه مرحله قبل و بعد از رسیدن به بلوغ جنسی خون‌گیری به عمل آمد. در هر دوره خون‌گیری یک نمونه خون به منظور تعیین غلظت پلاسمایی هورمون لپتین از هر هشت راس و شش نمونه متوالی خون و به فواصل 20 دقیقه از چهار راس از این دام‌ها به منظور تعیین غلظت پلاسمایی هورمون تستوسترون جمع‌آوری شدند. نتایج این مطالعه نشان داد که محدوده سن بلوغ در نژاد نجدی، 15-13 ماهگی و میانگین وزنی 91/36±08/120 کیلوگرم می‌باشد. غلظت پلاسمایی هورمون لپتین همبستگی منفی با هورمون تستوسترون (05/0P<، 43/0- r=)، سن (01/0P<، 77/0- r=)، وزن بدن (01/0P<، 39/0- r=)، محیط بیضه  (01/0P<، 62/0- r=) و ارتفاع بیضه (01/0P<، 72/0- r=) داشت. در کل می‌توان گفت با شروع پیوبرتی و افزایش غلظت تستوسترون، غلظت لپتین کاهش یافته که به دلیل اثر منفی تستوسترون بر تولید هورمون لپتین در بدن می‌باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Study of the relationship between plasma concentration of leptin and plasma in the Pre- and past puberty in Najdi male calves

نویسندگان [English]

  • Morteza Mamouei 1
  • Elham Mansuri 2
  • Khalil Mirzadeh 3
  • Armin Towhidi 4
  • Saleh Tabatabaei Vakili 5
  • Amin Kazemi Zadeh 6
1 Professor, Department of Animal Science, Faculty of Animal Sciences and Food Technology, Agricultural Sciences and Natural Resources University of Khuzestan, Mollasani, Ahvaz, Iran
2 Former M.Sc. Student, Department of Animal Science, Faculty of Animal Sciences and Food Technology, Agricultural Sciences and Natural Resources University of Khuzestan, Mollasani, Ahvaz, Iran
3 Associate Professor, Department of Animal Science, Faculty of Animal Sciences and Food Technology, Agricultural Sciences and Natural Resources University of Khuzestan, Mollasani, Ahvaz, Iran
4 Professor, Department of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
5 Department of Animal Science, Faculty of Animal Sciences and Food Technology, Agricultural Sciences and Natural Resources University of Khuzestan, Mollasani, Ahvaz, Iran
6 Ph.D. Candidate, Department of Animal Science, Faculty of Animal Sciences and Food Technology, Agricultural Sciences and Natural Resources University of Khuzestan, Mollasani, Ahvaz, Iran
چکیده [English]

The purpose of this study was to investigate the relationship between plasma leptin and blood testosterone concentration before and after puberty. Eight male Najdi calves with mean age of 7 months were used for this purpose. Blood samples were taken three times before and after reaching puberty. At each sampling period, a blood sample was collected to determine the plasma concentration of leptin from all 8 consecutive and 6 consecutive blood samples and at 20 min intervals from 4 animals to determine the plasma level of testosterone. The results of this study showed that the age of puberty in the Najdi race was 13-15 months old and the average weight was 120.08 ± 36.91 kg. Plasma leptin concentration was negatively correlated with testosterone (P <0.05, r = -0.43), age (P <0.01, r = -0.77), body weight (P <0.01, -0.39), testicular environment (r = -0.62, P <0.01) and testicular height (r = -0.72, P <0.01). In general, it can be concluded that with the onset of puberty and the increase in testosterone concentration, leptin concentration decreased due to the negative effect of testosterone on the production of leptin hormone in the body.

کلیدواژه‌ها [English]

  • Age of puberty
  • Calf
  • Correlation
  • testis dimensions
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