Relationship between Phenotypic Sexual Characters and Semen Characteristics in Four Strains of Cocks in Northern Nigeria

محورهای موضوعی : Camel

A.A. Ibrahim ¹ (Department of Animal Science, Federal University, Dutse. P.M.B. 7156, Dutse, Jigawa State, Nigeria)
N.K. Alade ² (Department of Animal Science, University of Maiduguri. P.M.B. 1069. Maiduguri, Borno State, Nigeria)
J. Aliyu ³ (Department of Animal Science, University of Maiduguri. P.M.B. 1069. Maiduguri, Borno State, Nigeria)
. A.I Muhammad ⁴ (Department of Animal Science, Federal University, Dutse. P.M.B. 7156, Dutse, Jigawa State, Nigeria)

تاریخ دریافت : 1392/04/17 تاریخ پذیرش : 1392/05/24 تاریخ انتشار : 1393/06/10

کلید واژه: poultry, wattle, comb, local strains, semen characteristics,

چکیده مقاله :

A study was carried out to evaluate the secondary sexual characteristics of four strains of cocks, comprising of two (2) exotics; Bovan Nera Black (BNB) and Isa Brown (ISB), one (1) improved local strain, Shika Brown (SB) and one (1) unimproved local strain, normal feathered cock (NFC). A total of 64 birds (16 for each strain) at 36, 38, 40 and 42 weeks were used for the study. The result indicated that shank length, comb length, comb width, wattle length and wattle width were all significantly (P<0.001) affected by strains, with the exotic strains being superior to the local cocks. Age × strain interactions were also found to be significant. Phenotypic correlations between the secondary sexual characters were found to be significantly high and positive. The correlation between the secondary sexual characters and semen characteristics showed that shank length, wattle length and width, comb length and width had a positive correlation with semen volume (r=0.123, 0.335, 0.195 and 0.408 and 0.348 P<0.01), total sperm count (r=0.202, 0.300, 0.188, 0.403 and 0.320 P<0.05) and normal sperm (r=0.175, 0.143, 0.026, 0.155 and 0.065 P<0.05) respectively. Shank length has a positive correlation with sperm motility (0.010) and dead sperm (0.026), but a negative correlation with live spermatozoa. The result of this study shows a considerable similarity among the strains of cocks with respect to secondary sexual traits. Therefore, it may be inferred from this study that length of shank, comb and wattle are good predictors of semen attributes in male chickens. Selecting cocks with larger shank length, comb and wattle size can improve the semen quality and subsequently, results to higher fertility.

چکیده انگلیسی:

به منظور بررسی صفات ثانویه جنسی 4 گونه خروس، متشکل از دو (2) گونه خارجی: بون نرا سیاه (BNB) و ایزا براون(ISB)، یک (1) سویه بهبود یافته بومی، شیکا قهوه‌ای (SB) و یک (1) سویه بومی بهبود نیافته، خروس با پر عادی (NFC) این تحقیق انجام شد. در مجموع 64 قطعه پرنده (16 قطعه از هر سویه) در 36، 38، 40 و 42 هفته در این مطالعه استفاده شد. نتیجه نشان داد که طول ساق پا، طول تاج، عرض تاج ، طول ریش و عرض ریش همگی تحت تأثیر سویه هستند (001/0P<) به طوری که گونه‌های خارجی نسبت به خروس‌های بومی ارجحیت داشتند. اثر متقابل سن و سویه نیز به طور معنی‌داری مشخص شد. بین صفات ثانویه جنسی همبستگی فنوتیپی معنی‌دار و مثبت وجود داشت. ارتباط بین صفات ثانویه جنسی ویژگی‌های مایع منی نشان داد که طول ساق، طول ریش و عرض، طول و عرض تاج همبستگی مثبتی با حجم مایع منی (123/0r=، 335/0، 195/0 و 408/0 و 438/0 01/0P<)، تعداد کل اسپرم‌ها (202/0r=، 300/0، 188/0 و 403/0 و 320/0 05/0P<) و تعداد اسپرم نرمال و (175/0r=، 143/0، 026/0 و 155/0 و 065/0 05/0P<) داشت. طول ساق پا با تحرک اسپرم (01/0) و درصد اسپرم مرده (026/0) همبسنگی مثبت داشت، اما همبستگی منفی با اسپرم زنده داشت. نتیجه این مطالعه نشان می‌دهد که شباهت قابل توجهی در میان گونه‌های خروس با توجه به صفات ثانویه جنسی وجود دارد. بنابراین، می‌توان از این مطالعه نتیجه گرفت که طول ساق پا، تاج و ریش پیش‌بینی خوبی از مایع منی در جوجه خروس‌ها می‌باشد. انتخاب خروس‌های با طول ساق پا، تاج و ریش بزرگتر می‌تواند به بهبود کیفیت مایع منی و در نتیجه باروری بیشتر منتهی شود.

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