تأثیر تغذیه متناوب پروتئین جیره بر تعادل نیتروژن و افزایش وزن روزانه در بره های نر پرواری

نوع مقاله : مقاله پژوهشی

نویسنده

گروه علوم دامی، دانشکده کشاورزی و منابع طبیعی مغان، دانشگاه محقق اردبیلی، اردبیل، ایران

10.22034/AEJ.2022.362321.2885

چکیده

این پژوهش به منظور بررسی تأثیر تغذیه متناوب پروتئین خام جیره بر تعادل نیتروژن و افزایش وزن روزانه در بره ­های نر پرواری انجام شد. ایجاد نوسان در پروتئین خام جیره و تغذیه متناوب آن در فواصل زمانی یک تا چند روز یکی از راهکارهای استفاده بهینه از پروتئین خام محسوب می شود. سه جیره غذایی با پروتئین خام 14، 12 و 16 درصد اما با انرژی یکسان تنظیم شدند. از 8 رأس بره نر در قفس های متابولیک به صورت طرح مربع لاتین 4×4 (چهار تیمار با 2 تکرار) استفاده شد. تیمار اول جیره ­ای با سطح پروتئین خام 14 درصد را به صورت ثابت دریافت می کرد. تیمارهای دوم تا چهارم جیره­ های با پروتئین خام 12 و 16 درصد را به ترتیب با تناوب 24، 48 و 72 ساعت دریافت می کردند. تعادل نیتروژن، مصرف خوراک، قابلیت هضم و برخی فراسنجه ­های شکمبه ­ای و خونی اندازه گیری شد. تفاوت معنی­ داری از نظر مصرف نیتروژن و دفع آن از طریق ادرار یا مدفوع در بین تیمارها مشاهده نشد. کم ترین نیتروژن دفع شده کل (ادرار و مدفوع) در تیمار با تناوب مصرف 48 ساعته مشاهده شد (0/031=P). نیتروژن ابقاء شده نیز در این تیمار نسبت به تیمار با تغذیه ثابت افزایش تمایل به معنی­ داری را نشان داد (0/055=P). تیمارهای آزمایشی از نظر مصرف ماده خشک و افزایش وزن روزانه تفاوت معنی­ داری نشان ندادند. بیش ترین قابلیت هضم ماده خشک در تیمار با تناوب مصرف 48 ساعته مشاهده شد (0/027=P) اما قابلیت هضم پروتئین خام و الیاف نامحلول در شوینده خنثی تفاوت معنی ­داری را در بین تیمارهای آزمایشی نشان ندادند. بیش ترین نیتروژن آمونیاکی شکمبه و نیتروژن اوره ­ای خون در تیمار با تناوب مصرف پروتئین خام 48 ساعته بود (0/05>P). نتایج نشان داد که استفاده از راهبرد تغدیه متناوب پروتئین خام در جیره بره های نر در حال رشد سبب بهبود ابقای نیتروژن و قابلیت هضم ماده خشک خوراک می­ شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Influence of oscillating dietary protein concentration on nitrogen balance and daily weight gain in fattening male lambs

نویسنده [English]

  • Taher Yalchi
Department of Animal Science, Moghan College of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran.
چکیده [English]

This study was conducted to investigate the effect of oscillating dietary protein concentration on nitrogen balance and daily weight gain in fattening male lambs. Oscillating crude protein in the diet and feeding it intermittently at intervals of one to several days is one of the ways to use crude protein optimally. Three diets were adjusted with 14, 12 and 16% crude protein but with the same energy. 8 male lambs were used in metabolic cages in a 4x4 Latin square design (four treatments with 2 replications). The first treatment received a diet with a crude protein level of 14% constantly. The second to fourth treatments received diets with 12 and 16% crude protein at intervals of 24, 48 and 72 hours, respectively. Nitrogen balance, feed consumption, digestibility and some rumen and blood parameters were measured. No significant difference was observed in terms of nitrogen consumption and excretion through urine or feces among the treatments. The lowest total excreted nitrogen (urine and feces) was observed in the treatment with 48-hour consumption interval (P=0.031). The retained nitrogen showed a significant increase in this treatment compared to the treatment with constant feeding (P=0.055). The experimental treatments did not show any significant difference in terms of dry matter consumption and daily weight gain. The highest digestibility of dry matter was observed in the treatment with 48-hour consumption interval (P=0.027) but, digestibility of crude protein and neutral detergent fiber did not show a significant difference between the experimental treatments. The highest rumen ammonia nitrogen and blood urea nitrogen were in the treatment with 48-hour crude protein consumption interval (P<0.05). The data indicate that the use of oscillating dietary crude protein concentration strategy in the diet of growing male lambs improves nitrogen retention and digestibility of dry matter.

کلیدواژه‌ها [English]

  • Excretion
  • Environment
  • Nitrogen balance
  • Sheep
  • Digestibility

مراجع

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فصلنامه محیط زیست جانوری
دوره 14، شماره 3
آبان 1401
صفحه 27-34

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