The Effects of Improved Feeding and Hormonal Treatments on Reproductive Performance of Desert Goats in the Sudan

الموضوعات

طب

الملخص

The study was conducted to investigate the effects of feed supplementation andhormonal treatment, using Controlled Internal Drug Release Device (CIDR) anddifferent doses of eCG, onthe reproductive performance of Desert goats and tostudy the effects of feed supplementation and postpartum administration ofGnRH or PGF2αon postpartum length and kidding interval. To realize theseobjectives three experiments were conducted.The first experiment involved 60 matured females divided into three groups (20in each). These groups in addition to grazing were supplemented with concentrateration at the rate of 0.0, 0.25, and 0.5 kg/head/day thus forming three groups: A,B and C, respectively. Again, according to the eCG doses given, each group wasdivided into two equal sub-groups (10 in each). Oestrous cycle in all the groupswere synchronized with CIDR for 13 days followed by administration of 500 i.uor 700 i.u eCG immediately followingremoval of CIDR. Regardless ofappearance of signs of oestrous, does were artificially inseminated 48-52 hoursafter CIDR removal, using fresh diluted semen. Goats, which returned to oestrus,were artificially re-inseminated. The treatments were randomly assigned in afactorial experiment using completely randomized design. The reproductive traitsmeasured in this experiment included oestrous response, interval from removal ofCIDR to occurrence of oestrous, durationof oestrous, non-return rate, pregnancyrate, kidding rate, twinning rate, litter size, gestation period and progesteroneprofile during gestation. The results indicated that all hormonal protocols werecapable of inducing and synchronizing oestrus in the Sudanese Desert goats.However, the response of does to oesrtus was observed in 85%, 75% and 75% fortreatment groups A, B and C, respectively, with the highest value scored bygroup A (P<0.05). The mean interval from removal of CIDR to occurrence ofXIVoestrus was 37.68, 28.62 and 33.35 hours for treatment groups A, B and C,respectively. The eCG doses had significant effect on the interval of oestrousoccurrence. The oestrous duration was 27.29, 27.56 and 31.60 hours for treatmentA, B and C, respectively. The overall non- return rate was 85% for group A, 80%for B and 80% for C, with significant difference between treatment groups. Theoverall kidding rate was 70.84%, 74.61%and 65.14% for treatment groups A, Band C, respectively, with significant difference. Where 500 iu eCG hadsignificant higher kidding rate than 700 iu eCG (P< 0.5). The twining rate wassignificantly higher (P< 0.5) for the doesin treatment group B, intermediate ingroup C, and lower in treatment group A. The litter size was significantly higherfor does in treatment groups B and C compared to group A. The mean birthweight of the kids were 2.04, 2.08 and 2.25 kg for treatment groups A, B and C,respectively. The male kids had heavier birth weight than female kids. However,the singleton kids had greater birth weight than twin kids. The mean gestationperiod was 151.22 for A, 149.69 for Band 151.25days for C. Does with tripletshad a significantly (P < 0.05) shorter gestation length than those with twins andsingleton. The gestation length of the does which were bearing male kids waslonger than those bearing female kids. The mean serum progesteroneconcentration during pregnancy was 5.93, 5.51and 5.47ng/ml for treatmentgroups A, B and C, respectively. The progesterone level began at 1.34 ng/ml andthen rose to reach 13.82 ng/ml as a maximum level, then declined and remainedabove 1 ng/ml until the end of the gestation period at parturition.The second experiment involved dividingdoes shortly after kidding into threesub-group comprising untreated group A and GnRH or PGF2αtreated groups Band C, respectively. The first postpartumoestrous to determine the postpartumperiod was monitored using a vasectomizedbuck and hormonal assay to detectXVthe first rise of progesterone in the blood. The results showed that the meanpostpartum period was 52.87 for A. 48.53 for B, and 49.47days for C. GnRHtreatment showed significantly shorter postpartum period than the control andPGF2α(P<0.05).The third experiment involved monitoring the does for two successive oestrouscycles, then all the groups were subjected to oestrous synchronization usingCIDR and administration of 500 i.u eCG followed by artificial insemination as inthe first experiment. The mean kidding interval for the treatment groups A, B andC were 248.03, 238.73 and 242.80 days, respectively, with group B showingsignificantly shorter interval (P<0.05).It could be concluded that feed supplementation with hormones improves theconception rate, kidding rate and litter size and shortens kidding interval.Therefore, with improved management ofDesert goats, the owners can harvestfour kid crops at 27 months interval. The study recommended further research onthe effect of season on the success rate of different hormonal protocols used foroestrous synchronization.

روابط وملفات

التعريف والنوع

رقم الوثيقة

03ce5d51-8a78-49b9-ab42-95f9ca5a5c86

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل دكتوراة

نوع الملف

pdf text

أسماء الملفات

1637917_1.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":"شرف الدين عبدالله","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"عبدالمطلب علي","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

English

المصدر والدورية

اسم المصدر

The Effects of Improved Feeding and Hormonal Treatments on Reproductive Performance of Desert Goats in the Sudan

المحتوى والصفحات

عدد الصفحات

0

إشراف وإعداد

الإشراف

شرف الدين عبدالله

الإعداد

عبدالمطلب علي

الاقتباسات الببليوغرافية