Correlations among Certain Growth and Production Traits in Different Breeds of Goats
محورهای موضوعی : Camelر. خانداکر 1 , م.ک.ای. خان 2 , م.م. ممین 3
1 - Department of Genetics and Animal Breeding, Chittagong Veterinary and Animal Science University Khulshi, Chittagong-4225, Bangladesh
2 - Department of Genetics and Animal Breeding, Chittagong Veterinary and Animal Science University Khulshi, Chittagong-4225, Bangladesh
3 - Department of Genetics and Animal Breeding, Chittagong Veterinary and Animal Science University Khulshi, Chittagong-4225, Bangladesh
کلید واژه: heritability, goats, correlations, (co)variances, different traits,
چکیده مقاله :
The study was conducted to estimate the genetic and phenotypic correlations among body measurements, body weight, kidding interval, kidding rate and milk yield in the different breeds of goat. Data was collected on 95 goats of three breeds (Jamunapari, Black Bengal and their crosses (Jamunapari×Black Bengal) through direct observation. The average body weight of Jamunapari goat was 34.75 ± 3.33 kg higher than Black Bengal (27.54 ± 5.332 kg) goats. It was observed that Jamunapari goat (0.65 ± 0.187 L/day) produces higher daily milk during lactation length than Black Bengal (0.50±0.094 L/day), leading to higher lactation milk production of this goat. The kidding rate and kidding interval were 1.33 ± 0.466 and 223.27 ± 11.19 days in Jamunapari, 1.475 ± 0.555 and 247.94 ± 17.23 days in crossbred, 1.75 and 160.83 ± 16.57 days in Black Bengal goats, respectively. The heritability estimates of body weight, milk yield and lactation milk yield were 0.29 to 0.32, 0.25 to 0.20 and 0.30 to 0.32 for all breeds of goat. The genetic correlation (rg) and phenotypic correlation (rp) of body weight were positive with all traits except the rg with lactation yield. The body length had negative rp with lactation production and negative rg with daily milk yield and lactation production. The body height has negative rp with kidding rate, kidding interval, milk yield and lactation production and positive rg only with kidding interval in all breeds. The high and positive correlations (either genetic or phenotypic) are important predictors of traits for improvement. Hence, these can be valuable tools for making selection/culling decisions for improved productivity of goats.
این مطالعه با هدف برآورد همبستگیهای ژنتیکی و فنوتیپی بین اندازههای بدنی، وزن بدن، فاصله زایش، نرخ زایش و تولید شیر در نژادهای مختلف بز صورت گرفته است. دادهها از 95 رأس بز از سه نژاد (جاموناپوری، بنگال سیاه و آمیختههای آنها (جاموناپوری×بنگال سیاه)) با مشاهده و اندازهگیری مستقیم جمعآوری گردید. میانگین وزن بدن در بزهای جاموناپوری برابر با 33/3 ± 75/34 کیلوگرم بوده که بیشتر از بنگال سیاه (332/5±54/27 کیلوگرم) است. مشاهدات حاکی از آن است که بز جاموناپوری با تولید شیر 187/0 ± 65/0 لیتر در هر روز، تولید بیشتری در مقایسه با بنگال سیاه (094/0±50/0 لیتر در هر روز) داشته و این موضوع ناشی از طول دوره شیردهی طولاتیتر در این نژاد است. نرخ زایش و فاصله زایش در جاموناپوری به ترتیب برابر با 466/0 ± 33/1 و 19/11 ± 27/233 روز بوده، در آمیختهها به ترتیب برابر با 555/0 ± 475/1 و 23/17 ± 94/247 روز و در بنگال سیاه به ترتیب 75/1 و 57/16 ± 83/160 روز بوده است. برآورد وراثتپذیری برای وزن بدن، تولید شیر و تولید شیر در طی دوره شیردهی برای همه نژادهای بز به ترتیب 29/0 تا 32/0، 25/0 تا 20/0 و 30/0 تا 32/0 بوده است. همبستگی ژنتیکی (rg) و همبستگی فنوتیپی (rp) وزن بدن با همه صفات به غیر از همبستگی ژنتیکی با تولید شیر در طی دوره شیردهی، مثبت بوده است. طول بدن همبستگی فنوتیپی مثبتی با تولید در طی دوره شیردهی داشته و همبستگی ژنتیکی منفی با تولید شیر و تولید در طی دوره شیردهی داشته است. ارتفاع بدن همبستگی فنوتیپی منفی با نرخ زایش، فاصله زایش، تولید شیر و تولید در طی دوره شیردهی داشته و همبستگی ژنتیکی مثبت تنها با فاصله زایش در همه نژادها داشته است. همبستگیهای مثبت و بالا (هم ژنتیکی و هم فنوتیپی) پیشبینی کنندههای مهمی برای صفات اصلاحی هستند. بنابراین این همبستگیها میتوانند ابزارهای ارزشمندی در طراحی راهبردهای انتخاب یا حذف برای کارآیی بهبود یافته بزها باشند.
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