اثر تزریق سطوح مختلف سلنیوم و ویتامین‎ E ‎بر متابولیسم هورمون‌های تیروئیدی، فراسنجه‌های ‏بیوشیمیایی خون در اواخر آبستنی گاوهای هلشتاین و عملکرد گوساله‌های آن‌ها ‏

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه تغذیه دام و طیور، دانشکده علوم دامی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان

2 استاد، گروه تغذیه دام و طیور، دانشکده علوم دامی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان

3 استادیار، گروه تغذیه دام و طیور، دانشکده علوم دامی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان

چکیده

 به­منظور مقایسه تأثیر تزریق سطوح مختلف سلنیوم و ویتامین E در اواخر آبستنی بر متابولیسم هورمون­های تیروئیدی، فراسنجه­های بیوشیمیایی خون گاوهای هلشتاین و عملکرد گوساله­ها آنها پس از تولد 28 رأس گاو آبستن نژاد هلشتاین در 8 هفته قبل از زایمان انتخاب و به طور تصادفی در 4 تیمار و 7 تکرار قرارداده شدند. سپس چهار و دو هفته قبل از زمان مورد انتظار برای زایمان، به گاوها سلنیوم و ویتامین E تزریق شد. تیمارها شامل شاهد، تزریق 15، 30 و 45 میلی­لیتر مکمل سلنیوم و ویتامینE  بودند. هر میلی­لیتر مکمل حاوی 5/0 میلی‌گرم سلنیوم به صورت نمک سلنیت سدیم و 50 واحد بین المللی ویتاامین E به صورت دی ال آلفا توکوفریل استات بود. گاوها از نظر سن، وزن و زمان زایمان متعادل بودند. نتایج نشان داد، تزریق سلنیوم و ویتامین E به گاو­های آبستن، بر عملکرد وزنی گوساله­های متولد شده­ی آنها تأثیر گذار می­باشد به‌طوری‌که افزایش وزن روزانه و وزن گوساله­ها در روز­های 30 )0456/0 (P=و 45 )0306/0 (P=روزگی در گروه­های دریافت­کننده­ی سلنیوم و ویتامین E نسبت به گروه شاهد افزایش یافت. دریافت سلنیوم و ویتامین E باعث مقاومت گاو­های آبستن در برابر کاهش گلوگز و تری‏گلیسیرید خون در زمان بعد از زایش می­شود. یک هفته بعد زایمان غلظت گلوگز (0480/0 (P= و تری‏گلیسیرید (0241/0 (P= خون در گاوهای تزریق شده نسبت به تیمار شاهد افزایش یافت. همچنین یک هفته قبل و بعد از زایمان، با افزایش دز تزریق سلنیوم و ویتامین E، میزان فعالیت آنزیم گلوتاتیون پراکسیداز و غلظت هورمون­های تترایدوتیرونین و تری­یدوتیرونین نیز افزایش یافت )05/0(P<. به‌طور کلی با توجه به نتایج حاضر، تزریق سلنیوم و ویتامین E به میزان حداقل 30 میلی­لیتر در اواخر آبستنی گاو­های هلشتاین قابل توصیه می­باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of different levels of selenium and vitamin E injection on thyroid hormones ‎metabolism and biochemical parameters in late pregnancy of Holstein cows and their ‎calf performance ‎

نویسندگان [English]

  • Mohammad Asadi 1
  • Taghi Ghoorchi 2
  • Abdolhakim Toghdory 3
  • hosein hoseini sabeghi 1
1 Ph.D. Candidate, Department of Animal and Poultry Nutrition, Faculty of Animal Science, ‎Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
2 Professor, Department of Animal and Poultry Nutrition, Faculty of Animal Science, Gorgan University of Agricultural Sciences and ‎Natural Resources, Gorgan, Iran
3 Assistant Professor, Department of Animal and Poultry Nutrition, Faculty of Animal Science, Gorgan University of Agricultural ‎Sciences and Natural Resources, Gorgan, Iran
چکیده [English]

To compare the effects of injection different levels of selenium and vitamin E in late pregnancy on thyroid hormone metabolism and biochemical parameters of Holstein cows and their calf performance, 28 pregnant Holstein cows were selected in 8 weeks before calving and randomly assigned to 4 treatments and 7 replications. Cows were then injected with selenium and vitamin E four and two weeks before the expected time for calving. Treatments included: injection of 0 (contro), 15, 30 and 45 ml of selenium and vitamin E supplements. Each ml of supplement contained 0.5 mg of selenium in the form of sodium selenite salt and 50 international units of vitamin E in the form of DL alpha tocopherol acetate. Cows were balanced in terms of age, weight and calving time. The results showed that injection of selenium and vitamin E in pregnant cows affected the weight performance of their calves (P<0.05) so that the daily weight gain and weight of calves at 30 and 45 days of age in Selenium and vitamin E treatments increased, compared to the control group (P<0.05). Receiving of selenium and vitamin E makes pregnant cows resistant to low blood glucose and triglycerides in the postpartum period. At one week after delivery. The concentration of glucose and blood triglycerides in the injected cows increased compare to the control treatment (P<0.05). Also, one week before and after delivery, with increasing the dose of selenium and vitamin E, the activity of glutathione peroxidase and the concentration of tetrahydrotyronine and triiodothyronine increased (P<0.05). In general, according to the present results, at least 30 ml of selenium and vitamin E at the end period of pregnancy for Holstein cows, could be recommended.

کلیدواژه‌ها [English]

  • Blood parameters
  • pregnant cows
  • selenium and vitamin E
  • thyroid hormones

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علوم دامی ایران
دوره 52، شماره 3
آذر 1400
صفحه 189-201

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  • تاریخ دریافت: 30 خرداد 1400
  • تاریخ بازنگری: 28 تیر 1400
  • تاریخ پذیرش: 19 مرداد 1400

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