Growth Modeling and Genetic Analysis on Growth Traits of Sirohi Goat under Field Conditions

محورهای موضوعی : Camel

ل. گاوتام ¹ , ر.آ. کومار ناگدا ² , ه. اشرف وایز ³

1 - Department of Animal Genetics and Breeding, College of Veterinary and Animal Science, Rajasthan University of Veterinary and Animal Science, Navania, Udaipur, India
2 - Department of Animal Genetics and Breeding, College of Veterinary and Animal Science, Rajasthan University of Veterinary and Animal Science, Navania, Udaipur, India
3 - Department of Livestock Production Management, College of Veterinary and Animal Science, Rajasthan University of Veterinary and Animal Science, Navania, Udaipur, India

تاریخ دریافت : 1396/12/09 تاریخ پذیرش : 1397/05/09 تاریخ انتشار : 1397/12/10

کلید واژه: heritability, growth traits, non-genetic factors, non-linear model, Sirohi goat,

چکیده مقاله :

The data on 6772 growth records of Sirohi goats maintained at All India Coordinated Research Projecton Sirohi goat at Livestock Research Station, Vallabhnagar, Udaipur, India, and recorded between 2004 and 2016, were analysed to study the growth related traits and their genetic control. The overall least squares means of body weight at birth, W3M, W6M, W9M, W12M, were 2.34 ± 0.03, 12.44 ± 0.19, 16.31 ± 0.22, 20.08 ± 0.47 and 25.09 ± 0.40 kg, respectively while least-squares means for pre- and post-weaning average daily gains were 113.66 ± 2.15 and 46.17 ± 0.94 g/day, respectively. The various non-genetic factors exhibited variable effects on the growth traits at different phases of age. Cluster and period of birth had significant effect on all growth traits. Season of birth had significant effect except birth weight. Summer born kids heavier and higher body weight and pre- and post-weaning gains than winter and rainy season born kids. Males had a higher weight and higher daily gain than females at almost all stages of growth. Kids of primiparous dams had significantly lower birth weight as compared to multiparous dams’ kids. Single born kids had a distinct advantage over those born in multiple births at all stages of growth. The regression on dam’s weight at kidding were positive significant for all stages of growth traits. The heritability estimates of all body weights and weight gains at different stages of growth were moderate (0.16-0.28), except for post-weaning average daily gain, which had low heritability (0.07±0.01). The phenotypic and genetic correlations among the different growth traits were positive and high, except for phenotypic correlation between pre- and post-weaning gains which was negative. Four non-linear growth models, viz., Gompertz, Brody, Logistic and Von Bertalanffy were used to describe the growth pattern in Sirohi kids based on the growth parameters. The highest R2 value and lowest mean absolute error (MAE), akaike’s information criteria (AIC) and mean absolute percentage error (MAPE) values were observed in Brody model.

چکیده انگلیسی:

داده‌های روی 6772 رکورد رشد بزهای Sirohi نگهداری شده در تمامی مراکز تحقیقاتی هماهنگ شده بز Sirohi هند در ایستگاه تحقیقاتی دام‌های اهلی، والابهنگار، اودایپور، هند، و رکوردگیری شده بین 2004 و 2016، برای مطالعه صفات رشد مرتبط و کنترل ژنتیکی آنها آنالیز شدند. به‌طور کلی میانگین‌های حداقل مربعات وزن بدن در تولد، 3 ماهگی، 6 ماهگی، 9 ماهگی، 12 ماهگی به ترتیب 0.03 ± 2.34، 0.19 ± 12.44، 0.22 ± 16.31، 0.47 ± 20.08 و 0.40 ± 25.09 کیلوگرم، بودند. اگرچه میانگین‌های حداقل مربعات برای میانگین رشد روزانه پیش و پس از شیرگیری 2.15 ± 1113.66 و 0.94 ± 46.17 گرم / روز، به ترتیب بودند. فاکتورهای غیر ژنتیکی گوناگون اثرات متغییری روی صفات رشد در فازهای متفاوتی از سن نشان دادند. خوشه و دوره تولد اثر معنی‌داری روی تمامی صفات رشد داشت. فصل تولد اثر معنی‌داری داشت به­ جز وزن تولد. بزغاله‌های متولد شده تابستان وزن بدن بیشتر و سنگین‌تر و رشد پیش و پس از شیرگیری نسبت به بزغاله‌های متولد شده در زمستان و فصل بارانی داشتند. نرها وزن بیشتر و رشد روزانه بیشتر نسبت به ماده‌ها در تقریباً همه مراحل رشد داشتند. بزغاله‌های نخستین مادرها وزن تولد کمتری معنی‌داری در مقایسه با بزغاله‌های مادران چند شکم داشتند. بزغاله‌های متولد شده منفرد مزیت متمایزی نسبت به آنهایی که چندقلو متولد شده بودند در تمامی صفات رشد داشتند. تابعیت رویوزن مادر در بزغاله‌زایی برای تمامی مراحل صفات رشد مثبت معنی‌دار بودند. وراثت‌پذیری برآورد شده تمامی اوزان بدن و رشدهای وزنی در مراحل متفاوت از رشد متوسط بودند (0.28-0.16)، به ­جز برای متوسط رشد روزانه پس از شیرگیری، که وراثت‌پذیری پایینی داشت (0.01±0.07). همبستگی‌های ژنتیکی و فنوتیپی در میان صفات متفاوت رشد مثبت و بالا بود، به­جز برای همبستگی فنوتیپی بین رشدهای پیش و پس از شیرگیری که منفی بود. برای مدل‌های رشد غیر خطی، viz، Gompertz، Brody، Logistic و Von Bertalanffy برای توضیح الگوی رشد در بزغاله‌های Sirohi براساس پارامترهای رشد استفاده شدند. بیشترین مقدار R2و ارزش‌های کمترین خطای مطلق میانگین (MAE)، معیار اطلاعاتی آکائیک (AIC) و درصد خطای مطلق میانگین (MAPE) در مدل Brody مشاهده شدند.

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