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تأثیر مرحلة بلوغ و زمان برداشت بر پروتئین قابل‌دسترس علوفة یونجه برای گاوهای شیری

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی سابق کارشناسی ارشد، گروه علوم دامی، دانشکدة کشاورزی، دانشگاه ایلام

2 دانشیار، گروه علومی دامی، دانشکده کشاورزی، دانشگاه ایلام

3 استادیار، گروه علوم دامی، دانشکدة کشاورزی، دانشگاه ایلام

چکیده

این آزمایش برای بررسی تأثیر مرحلة بلوغ و زمان برداشت بر ترکیب شیمیایی و محتوای پروتئین قابل‌دسترس علوفة یونجه برای گاوهای شیری انجام شد. علوفة یونجه در دو مرحلة بلوغ (پیش از گلدهی و اوایل گلدهی) و در دو زمان (صبح و عصر) برداشت شد. پروتئین قابل‌دسترس با مدل NRC (2001) و مدل هلندی (DVE/OEB) پیش­بینی شد. در مدل NRC (2001)، علوفة یونجة برداشت‌شده در پیش از گلدهی و عصر، تولید پروتئین میکروبی از انرژی و پروتئین میکروبی قابل‌جذب بالاتر و تعادل پروتئین قابل‌تجزیه در شکمبه پایین­تر داشت (05/0>P). اما محتوای پروتئین قابل سوخت‌وساز (متابولیسم) تحت تأثیر مرحلة بلوغ و زمان برداشت قرار نگرفت (05/0<P). در مدل DVE/OEB، علوفة یونجة برداشت‌شده پیش از گلدهی و عصر، مادة آلی قابل تخمیر، تولید پروتئین میکروبی از مادة آلی و پروتئین میکروبی قابل‌جذب بیشتر و تعادل پروتئین قابل‌تجزیه در شکمبه کمتر داشت (05/0>P). به‌طورکلی، یونجة برداشت‌شده در پیش از گلدهی و عصر پروتئین قابل‌دسترس بیشتری برای گاوهای شیری داشت.

کلیدواژه‌ها


عنوان مقاله [English]

Effects of alfalfa maturity and cutting times on availability of alfalfa hay protein for dairy cows

نویسندگان [English]

  • Safora Yousefinezhad 1
  • Farshid Fattahnia 2
  • Mehdi Rashnavadi 3
  • Sayed Gholamreza Mossavi 1
  • Golnaz Taasoli 3
1 Former M.Sc. Student, Department of Animal Science, University of Ilam, Ilam, Iran
2 Associate Professor, Department of Animal Science, University of Ilam, Ilam, Iran
3 Assistant Professor, Department of Animal Science, University of Ilam, Ilam, Iran
چکیده [English]

This experiment was conducted to consider the effects of maturity and cutting time on chemical composition and available protein content of alfalfa hay for dairy cows.. Alfalfa hay harvested at two maturity stages (Pre-bloom and Early bloom) and two cutting times (Morning and Afternoon). Available protein was predicted using NRC (2001) and DVE/OEB (1994) models. In the NRC model (2001), alfalfa hay harvested pre-bloom and in the afternoon had higher microbial protein synthesized in the rumen from energy and absorbable microbial protein and lower ruminal degraded protein balance (P<0.05). But, metabolizable protein content was not affected by maturity stage and cutting time (P>0.05). In the DVE/OEB model, pre-bloom alfalfa harvested in the afternoon had higher fermentable organic matter, microbial protein synthesized from organic matter and absorbable microbial protein and lower ruminal degraded protein balance (P<0.05). In conclusion, pre-bloom alfalfa hay harvested in the afternoon had higher available protein for dairy cows.

کلیدواژه‌ها [English]

  • Alfalfa
  • Degradability
  • Microbial protein
  • protein evaluation
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