نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش‌آموخته کارشناسی ارشد، گروه علوم دامی، دانشکده کشاورزی، دانشگاه زابل، زابل، ایران.

2 دانشیار، گروه علوم دامی و بیوانفورماتیک، دانشکده کشاورزی، دانشگاه زابل، زابل، ایران.

3 دانشیار، گروه علوم دام و طیور، پردیس ابوریحان، دانشگاه تهران، پاکدشت، ایران.

4 استادیار، پژوهشکده دام‌های خاص، دانشگاه زابل، زابل، ایران.

5 استادیار، مرکز تحقیقات کشاورزی و منابع طبیعی سیستان، زابل، ایران.

چکیده

هدف از این پژوهش، برازش مدل­های غیرخطی مختلف برای توصیف منحنی رشد و انتخاب مناسب­ترین مدل توصیف­کننده منحنی رشد برای گوساله­های گاو سیستانی بود. از رکوردهای وزن بدن 241 گوساله (118 رأس نر و 123 رأس ماده) که توسط ایستگاه تحقیقات گاو سیستانی زهک بین سال­های 1389 تا 1396 جمع­آوری شده بود، استفاده شد. چهار مدل غیرخطی (گمپرتز، لجستیک، ریچاردز، و ویبول) بر روری رکوردهای وزن بدن برازش و مناسب­ترین مدل توسط معیار­های برازش نیکویی (جذر میانگین مربعات خطا، معیار اطلاعات بیزی، معیار اطلاعات آکائیک و ضریب تعیین تصحیح‌شده) مورد ارزیابی قرار گرفت. براساس معیار­های برازش نکویی، مدل ریچاردز مناسب­ترین تابع برای توصیف منحنی رشد در گوساله­های نر و ماده بود. اثر جنس بر روی فراسنجه­ های منحنی­ ها در بسیاری از توابع معنی­ دار بود (0/05>P). مدل­های لجستیک و ریچاردز به‌ترتیب بالاترین و پایین­ترین مقدار فراسنجه مرتبط با وزن ابتدایی را داشتند. گوساله­های نر در سن و وزن بالاتری نسبت به گوساله ­های ماده به نقطه عطف رسیدند. با توجه به نتایج حاصل برای مدیریت بهتر تغذیه­ای و انتخاب برای رشد سریع با صحت بالا، می­توان از مدل مناسب جهت بررسی الگوی رشد این نژاد استفاده نمود.

کلیدواژه‌ها

عنوان مقاله [English]

Comparison of some non-linear mathematical models to describe the growth curve of Sistani calves

نویسندگان [English]

  • Noorolahe SHahroodi 1
  • Mohammad Rokouei 2
  • Hadi Faraji- Arough 3
  • Ali Maghsoudi 4
  • Morteza Kykha Saber 5

1 Former M.Sc. Student, Department of Animal Science, Faculty of Agriculture, University of Zabol, Zabol, Iran

2 Associate Professor, Department of Animal Science and Bioinformatics, Agriculture Faculty, University of Zabol, Zabol, Iran. ;Associate Professor, Department of Animal and Poultry Science, College of Aburaihan, University of Tehran Pakdasht, Tehran, Iran.

3 Assistant Professor, Research Center of Special Domestic Animals, University of Zabol, Zabol, Iran

4 Associate Professor, Department of Animal Science and Bioinformatics, Agriculture Faculty, University of Zabol, Zabol, Iran

5 Assistant Professor, Agricultural Research, Education and Extension Organization, Zabol, Iran

چکیده [English]

The purpose of this study was to fit different nonlinear models to describe growth curve and selection the best model to describe a growth curve for calves of Sistani calves. Body weight records of 241 calves (118 males and 123 females) collected by the Sistani Dairy Cattle Research Station of Zahak from year 2010 to 2017 were used. Four nonlinear models (Gompertz, Logistic, Richards, and Weibull) were fitted to the body weight records and the best model was selected by the goodness-of-fit criteria (Mean square error, Bayesian information criterion, Akaike information criterion and corrected coefficient of determination). According to goodness-of-fit criteria, Richards model was the most appropriate model to describe the growth curve in male and female calves. The effect of sex on curve parameters was significant in many functions (P <0.05). Logistic and Richards models had the highest and the lowest initial weight parameter, respectively. Male calves reached to the inflection point in a higher age and weight compared to female calves. According to the results of this study, a proper model can be used to study the growth pattern of this breed in order to better nutritional management and selection for rapid growth with high accuracy.

کلیدواژه‌ها [English]

  • Body weight
  • Goodness of fit
  • Richards model
  • Sistani calve
  • Weight at inflection point
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