Comparison of Growth of Male and Female Kids of Nondescript Goats in a Semi Arid Region of Nigeria

محورهای موضوعی : Camel

A.O. Raji ¹ ( Department of Animal Science, University of Maiduguri, Maiduguri, Nigeria )
L.G. Asheikh ² ( Department of Animal Science, University of Maiduguri, Maiduguri, Nigeria )
I.D. Mohammed ³ ( Department of Animal Science, University of Maiduguri, Maiduguri, Nigeria )

تاریخ دریافت : 1392/11/06 تاریخ پذیرش : 1393/02/10 تاریخ انتشار : 1393/12/10

کلید واژه: body weight, monomolecular model, non-linear models, Richards model,

چکیده مقاله :

This study compared the use of five different models to describe the growth from birth to 20 weeks of age of kids from both genders of nondescript goats. Fifty nine (59) nondescript kids were weighed weekly at the university of Maiduguri livestock teaching and research farm, Nigeria and the live weights were modeled. Biologically relevant variables were estimated for each kid from the Logistic, Gompertz, Richards, Monomolecular and Weibull models. Models were compared using the following goodness of fit criteria: coefficient of determination (R2), mean square error (MSE), standard deviation (SD) and Akaike information criteria (AIC). In both genders, all nonlinear models fitted the data well, with high R2 ranging from 0.911 to 0.943 and 0.923 to 0.95 for male and female, respectively. In addition, the males had higher asymptotic weight than females while the reverse was observed with regards to maturing rate. Male kids had heavier inflexion weight and higher age than females for all the models. These values were however higher for Logistic than Gompertz model. The monomolecular model had higher R2 and lower MSE, SD and AIC in both male and female kids. It can be concluded that the nonlinear growth models were suitable for estimating live weight as a function of age for both male and female of nondescript kids in Nigeria. However, the best model was the monomolecular based on model parameters and goodness of fit criteria.

چکیده انگلیسی:

این مطالعه کاربرد پنج مدل مختلف برای توصیف رشد بزغاله‌های دو جنس نر و ماده ناندسکریپت از تولد تا 20 هفتگی را مقایسه می‌کند. تعداد پنجاه و نه (59) بزغاله ناندسکریپت در مزرعه آموزشی و تحقیقاتی دانشگاه مایدوگوری نیجریه به طور هفتگی توزین شدند و مدل سازی بر اساس وزن زنده صورت گرفت. متغیرهای بیولوژیکی مربوطه برای هر بزغاله از طریق مدل‌های لجستیک، گمپرتز، ریچاردز، مونو مولکولی و مدل وایبل برآورد شد. مدل‌ها با استفاده میزان انطباق معیارهای ضریب تعیین (R2)، میانگین مربع خطا (MSE)، انحراف معیار (SD) و معیارهای اطلاعات آکائیک (AIC) مقایسه شدند. در هر دو جنس، همه مدل‌های غیر خطی به خوبی برازانده شدند، با R2 در دامنه 911/0-943/0 و 923/0-95/0 به ترتیب برای نر و ماده بود. علاوه بر این، نرها وزن تقریبی بالاتری در مقایسه با ماده‌ها داشتند در حالیکه عکس آن در مورد نرخ رشد مشاهده شد. بزغاله‌های نر وزن عطف سنگین تر و سن بالاتر از ماده‌ها برای تمام مدل داشتند. با این حال، این مقادیر برای مدل لجستیک بیشتر از گومپرتز بود. مدل تک ملکولی R2 بالاتر و MSE، SD و AIC پایین‌تر در هر دو جنس نر و ماده داشت. می‌توان نتیجه گرفت که مدل‌های رشد غیر خطی برای برآورد وزن زنده به عنوان تابعی از سن برای هر دو جنس نر و ماده بزغاله‌های ناندسکریپت در نیجریه مناسب بود. با این حال، بهترین مدل تک مولکولی بر اساس فراسنجه‌های مدل و میزان انطباق معیارهای مناسب بود.

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