اثر پروتئین قابل متابولیسم در جیره پیرامون زایش بر عملکرد، فراسنجه‌های خونی و پاسخ ایمنی میش‌های افشاری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 محقق بخش تحقیقات علوم دامی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان زنجان، زنجان – ایران

2 استاد گروه علوم دامی، دانشکده کشاورزی، دانشگاه زنجان، زنجان - ایران

3 استاد گروه علوم دامی، دانشکده مهندسی علوم زراعی و دامی، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران، کرج - ایران

4 استادیار گروه علوم دامی، دانشکده کشاورزی، دانشگاه زنجان، زنجان - ایران

5 استادیار بخش تحقیقات تغذیه و فیزیولوژی، مؤسسه تحقیقات علوم دامی کشور، کرج - ایران

چکیده

هدف از این پژوهش، بررسی اثر سطوح متفاوت پروتئین قابل‌متابولیسم در جیره پیرامون زایش بر عملکرد و فراسنجه‌های خونی میش‌های افشاری و بره‌ها بود. 32 رأس میش یک بار زایشطی شش هفته آخر آبستنی و شش هفته اول شیردهی با جیره‌های غذایی قبل و بعد از زایش محتوی پروتئین قابل‌متابولیسم پایین و بالا به ترتیب معادل و 20 درصد بالاتر از نیاز میش دو قلوزای توصیه شده توسط انجمن تحقیقات ملی به صورت آزمایش فاکتوریل در قالب طرح کاملاٌ تصادفی تغذیه شدند. ماده خشک مصرفی، وزن بدن، امتیاز وضعیت بدنی میش و تغییرات آنها، وزن بره در یک و سه هفتگی و افزایش وزن روزانه بره‌ها تحت تأثیر تیمارهای آزمایشی قرار نگرفت. مقدار و ترکیبات آغوز تحت تأثیر تیمارهای آزمایشی قرار نگرفت، اما افزایش تولید شیر در تیمار حاوی پروتئین قابل متابولیسم پایین در قبل و بعد از زایش (007/0P=) نسبت به سایر تیمارها مشاهده شد. غلظت اوره (0001/0 P=) و کلسترول پلاسما (02/0 P=) به طور معنی‌دار در تیمار پروتئین قابل متابولیسم بالا نسبت به تیمار پروتئین قابل متابولیسم پایین در اواخر آبستنی بیشتر بود. کاهش مقاومت به انسولین (03/0 P=) و افزایش حساسیت به انسولین (01/0 P=) در تیمار حاوی پروتئین قابل متابولیسم پایین در قبل و بعد از زایش مشاهده شد. تفاوت معنی‌دار بین تیمارها از نظر تعداد گلبول‌های سفید، قرمز و دیگر سلول‌های خونی مشاهده نشد. براساس نتایج این آزمایش، درصد پروتئین قابل متابولیسم تعیین شده توسطانجمن تحقیقات ملی، برای میش‌های افشاری در اواخر دوره آبستنی و اوایل شیردهی توصیه می‌شود.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of metabolizable protein in the diet peri parturition on performance, blood parameters and immune response Afshari ewes

نویسندگان [English]

  • Seyyed Saeid Mousavi 1
  • Hamid Amanlou 2
  • Ali Nikkhah 3
  • Hamid Reza Mirzaei Alamouti 4
  • Ali Moustafa Tehrani 5
1 Researcher, Department of Animal Science Research,Agriculture and Natural Resources Research and Education Center of Zanjan, Zanjan - Iran
2 Professor, Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjan - Iran
3 Professor, Department of Animal Science, University College of Agriculture & Natural Resources, University of Tehran, Karaj - Iran
4 Assistant Professor, Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjan - Iran
5 Assistant Professor, Department of Nutrition and Physiology, Animal Science Research Institute, Karaj - Iran
چکیده [English]

The aim of this study was to investigate the effects of different metabolizable protein levels in diet during the peri parturition on performance and blood parameters of Afshari ewes and lambs. Thirty two once lambing ewes in the last six weeks of pregnancy and the first six weeks of lactation with diets before and after parturition containing rates of NRC recommended and 20% higher one as low and high amount of metabolizable protein respectively requirements of ewe with two lambs as Factorial experiment in a completely randomized design were fed. Dry matter intake, body weight, body condition score ewes and their changes, weight lamb in the first and third weeks, and daily weight gain of lambs were not affected by treatments. Amount and composition of the colostrum were not affected by the treatments, but milk yield increasing was observed at low metabolizable protein before and after lambing treatment(p=0.007) as compared to other treatments. Urea (P = 0.0001) and cholesterol (P = 0.02) of plasma were significantly higher in high metabolizable protein than the low metabolizable protein in late gestation. Reducing insulin resistance (P = 0.03) and increasing insulin sensitivity (P = 0. 01) were observed in the treatment low metabolizable protein before and after lambing. No significant difference was observed on the numbers of white blood cells, red blood cells and other blood cells between the treatments. The results of this study, the percentage of metabolizable protein by the NRC for Afshari ewes during late gestation and early lactation is advisable.

کلیدواژه‌ها [English]

  • Immune
  • Metabolizable Protein
  • Performance
  • sheep
  • Lamb
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