Body Measurement of Red Sokoto Bucks in Nigeria and Their Relationship with Testicular Biometrics

محورهای موضوعی : Camel

E.O. Ajao ¹ , M.O. Akinyemi ² , E.O. Ewuola ³ , O.H. Osaiyuwu ⁴

1 - Department of Animal Science, Faculty of Agriculture and Forestry, University of Ibadan, Ibadan, Nigeria
2 - Department of Animal Science, Faculty of Agriculture and Forestry, University of Ibadan, Ibadan, Nigeria
3 - Department of Animal Science, Faculty of Agriculture and Forestry, University of Ibadan, Ibadan, Nigeria
4 - Department of Animal Science, Faculty of Agriculture and Forestry, University of Ibadan, Ibadan, Nigeria

تاریخ دریافت : 1392/09/22 تاریخ پذیرش : 1393/01/26 تاریخ انتشار : 1393/09/10

کلید واژه: age, body measurements, body condition score, epididymal biometrics, Red Sokoto buck, testicular,

چکیده مقاله :

Ninety Red Sokoto bucks were used to assess the relationship between body, testicular and epididymal measurements in three age groups (group 1: 7-12 months; group 2: between 1 and 2 years and group 3: older than 2 years). The effect of age on body and testicular / epididymal measurements was analyzed. A predictive model was developed for each of the testicular / epididymal measurements using live body measurements. Age of the buck had a significant effect (P<0.05) on the body weight, paunch girth, scrotal circumference, testicular and epididymal measurements (testicular volume, testicular weight, caput weight and caudal weight). Higher correlation coefficients were recorded between testicular volume and testicular weight and between caput weight and epididymal weight in all groups (group 1: r=0.99 and r=0.95; group 2: r=0.97 and r=0.95; group3: r=0.97 and r=0.93, respectively). Scrotal circumference was found to be independently related to some testicular and / or epididymal measurements in groups 1 and 2. In the multivariate linear regression model, all body parameters used were found to be related to some of the testicular and epididymal measurements. The results indicated that selection for replacement breeding bucks could be done for bulks up to two years of age using data on scrotal circumference.

چکیده انگلیسی:

نود راس بز نر سوکوتو قرمز برای ارزیابی ارتباط بین ابعاد بدنی، بیضه و اپیدیدیم در سه گروه سنی (گروه 1: 7-12 ماه، گروه 2: 1-2 سال و گروه 3: بیش از 2 سال) استفاده شدند. اثر سن روی ابعاد بدن و ابعاد بیضه / اپیدیدیم آنالیز شد. یک مدل پیش‌بینی برای ابعاد صفات بییضه / اپیدیدیم با استفاده از ابعاد بدن دام زنده توسعه داده شد. سن بزهای نر اثر معنی‌داری (05/0P<) روی وزن بدن، دور شکم، محیط اطراف بیضه، ابعاد صفات مربوط به بیضه و اپیدیدیم (حجم بیضه، وزن بیضه، وزن سر و دم اپیدیدیم) داشت. ضرایب همبستگی بالاتری بین حجم بیضه و وزن آن و بین وزن سر اپیدیدیم و وزن اپیدیدیم در همه گروه‌های سنی (به ترتیب 99/0r= و 95/0r= در گروه 1، 97/0r= و 95/0r= در گروه 2 و 97/0r= و 93/0r= در گروه 3) مشاهده شد. محیط اطراف کیسه بیضه به طور مستقل با بعضی از ابعاد بیضه یا اپیدیدیم در گروه‌های 1 و 2 ارتباط داشت. در مدل رگرسیونی خطی چند متغییره همه فراسنجه‌های بدنی مورد استفاده با بعضی از ابعاد صفات مرتبط با بیضه و اپیدیدیم ارتباط داشتند. نتایج مشخص نمود که انتخاب برای بزهای نر جایگزین اصلاحی بایستی برای بزهای نر تا 2 سال سن با استفاده از داده‌های محیط پیرامونی کیسه بیضه انجام شود.

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