Reproductive Performance of Abergelle Goats Raised under Traditional Management Systems in Sekota District, Ethiopia
محورهای موضوعی : Camel
1 - Sirinka Agricultural Research Center, Woldia, Ethiopia
2 - College of Agriculture and Environmental Science, Bahir Dar University, Bahir Dar, Ethiopia
کلید واژه: litter size, age at first kidding, kidding interval, kidding rate,
چکیده مقاله :
A study to evaluate the reproductive performance of Abergelle goat was carried out at Sekota District of Amhara National Regional State. On-farm flocks from two peasant associations were monitored for two years to collect data. Data collected included identification number of doe and kid, birth / kidding date, kid birth weight, sex of kid, post partum doe weight, litter size, parity of doe. Data analysis was usingthe General Linear Model procedures of the Statistical Analysis System. The overall least squares mean litter size and annual kidding rate were 1.04 and 1.45, respectively. Parity of doe, season of kidding and doe post-partum weight affected (P<0.01) litter size that parity five, dry season kidded and heavy does had the highest litter. Annual kidding rate was affected (P<0.001) by birth type and season of birth. Does that gave twin births and kidded in the dry and wet season had larger litters. The overall least squares mean age at first kidding and kidding interval were 448 and 290 days,respectively. Age at first kidding was not affected by the fixed effects considered. Kidding interval was affected by season of previous kidding. Does with kidding in the wet season have short kidding interval than does that gave birth in cool season. Does’ previous postpartum weight had effect (P<0.01) on kidding interval of Abergelle goats, in that light weight does had longer kidding interval than their heavy and medium weight contemporaries. The result of the current study shown that litter sizes are very low compared to other tropical breeds. The effect of parity could be avoided by improving the management level. In general, improving the general management level and breeding methods of goats will improve reproductive performance and productivity of this breed of goat.
مطالعهای جهت ارزیابی عملکرد تولیدمثلی بز نژاد ابرگل در منطقه سکوتا در ایالت ملی-منطقهای آمهارا صورت گرفت. گلههای عضو دو اتحادیه روستایی به مدت دو سال جهت جمعآوری دادهها مورد بررسی و نظارت قرار گرفتند. دادههای جمعآوری شده شامل شماره شناسایی بز ماده و بزغاله، تاریخ زایش یا تولد، وزن تولد بزغاله، جنس بزغاله، وزن مادر پس از زایش، تعداد همزادان و شکم زایش مادر بود. تجزیه دادهها با استفاده از رویه مدل خطی عمومی سیستم تجزیه آماری انجام شد. میانگین حداقل مربعات کلی تعداد همزادان و نرخ زایش سالیانه به ترتیب 04/1 و 45/1 بود. شکم زایش، فصل زایش و وزن مادر پس از زایش بر تعداد همزادان اثر داشت (01/0>P)، به طوریکه شکم زایش پنجم، فصل خشک زایش و مادران سنگین دارای بیشترین تعداد همزادان بودند. نرخ زایش سالیانه به وسیله نوع تولد و فصل تولد تحت تأثیر قرار گرفت (001/0>P). مادرانی که دوقلوزا بوده و در فصل خشک و مرطوب زایش نمودند دارای همزادان بزرگتری بودند. میانگین حداقل مربعات کلی سن در هنگام اولین زایش و فاصله بین دو زایش به ترتیب 448 و 290 روز بود. سن در زمان اولین زایش به وسیله اثرات ثابت مدنظر تحت تأثیر قرار نگرفت. فاصله بین دو زایش به وسیله فصل زایش قبلی تحت تأثیر قرار گرفت. مادرانی که در فصل مرطوب زایش بودند در مقایسه با مادران زایش نموده در فصل خنک دارای فاصله بین دو زایش کوتاهتری بودند. وزن پس از زایش قبلی مادران بر فاصله بین دو زایش بزهای ابرگل اثر داشت (01/0>P) و مادران سبک وزن دارای فاصله بین دو زایش طولانیتری نسبت به مادران متوسط یا سنگین وزن بودند. نتایج مطالعه حاضر نشان داد که تعداد همزادان در مقایسه با سایر نژادهای مناطق گرمسیری خیلی کم بودند. اثر شکم زایش میتواند به وسیله بهبود سطح مدیریتی خنثی شود. به طور کلی، بهبود سطح کلی مدیریت و روشهای پرورشی بزها عملکرد تولیدمثلی و تولیدی این نژاد بز را بهبود خواهد داد.
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