استفاده از قانون بازده نزولی به ‌منظور تفکیک لیزین و متیونین مصرفی به نیازمندی های نگهداری و رشد در جوجه‌های گوشتی نر جوان

نوع مقاله : مقاله پژوهشی

نویسنده

استادیار گروه علوم دامی دانشکده کشاورزی دانشگاه گیلان

چکیده

در این مطالعه با استفاده از داده‌های آزمایشی برگرفته شده از مقالات معتبر بین‌المللی، کاربردی بودن مدل رشدی مونومولکولر در راستای فراهم نمودن تخمین‌هایی برای نیازمندی­های نگهداری و رشد به لیزین و متیونین در جوجه‌های نر جوان مورد ارزیابی قرار گرفت. به منظور تجزیه و تحلیل آماری داده‌ها از رویه NLMixed برنامه آماریSAS  استفاده شد. جهت اعتبارسنجی مدل، از معیارهای متفاوتی از قبیل نحوه رفتار مدل در برازش داده‌ها، معیارهای آماری (ضریب تعیین و اشتباه معیار) و همچنین معنی‌دار بودن نیازهای برآورده شده توسط مدل از نظر بیولوژیکی استفاده شد. در مطابقت با نحوه رفتار مورد انتظار از مدل، متوسط راندمان استفاده از لیزین و متیونین در سطوح مصرفی پائین این اسیدهای آمینه در مقایسه با سطوح مصرفی بالاتر بیشتر بود و با افزایش سطح مصرف اسیدهای آمینه، این راندمان کاهش پیدا کرد. با توجه به توانایی مدل در برازش داده‌ها و همچنین مطابقت نزدیک بین تخمین‌های صورت گرفته توسط مدل و مقادیر گزارش شده توسط سایر محققین، نتایج نشان دهنده کاربردی بودن این مدل در راستای برآورد نیازمندی­های نگهداری و رشد به لیزین و متیونین در جوجه‌های گوشتی است.

کلیدواژه‌ها

عنوان مقاله [English]

Application of the law of diminishing returns for partitioning lysine and methionine intake between maintenance and growth in young broiler chicks

نویسنده [English]

  • H. Darmani Kuhi
Department of Animal Science, Faculty of Agricultural Sciences, University of Guilan
چکیده [English]

In the study presented here, the scope of a reparameterized monomolecular model was extended in growing young male chicks to provide an estimate of their lysine and methionine requirements for maintenance and growth. The equation was used with the NLMixed procedure of SAS to estimate parameters and combine them to determine other biological indicators. A number of criteria were used to evaluate general goodness of fit of the model, including model behavior, biologically meaningful parameter estimates and statistical performance. The estimated maintenance requirements and the determined values of lysine and methionine requirements for protein accretion were in good agreement with values reported previously by other researchers. Average efficiency of recovering lysine and methionine were greatest at low intakes and decreased as intakes increased. In conclusion, results presented here showed the applicability of the monomolecular equation to predict the magnitude and direction of responses of growing young broilers to dietary lysine and methionine intake without making any initial assumptions.

کلیدواژه‌ها [English]

  • Broilers
  • Lysine
  • Methionine
  • Maintenance and growth requirements
  • The law of diminishing returns

مراجع

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