| Titles |
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English :
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Evaluation of different protocols for synchronization of estrus and ovulation in postpartum subestrus lactating dairy cows
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Arabic :
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تقييم استخدام بروتوكولات مختلفة لاحداث الشياع و التبويض في ابقار اللبن الحلابة الخاملة جنسيا بعد الولادة
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| Abstract |
Thirty three Friesian cows in postpartum subestrus were used in this study to compare two protocols for synchronization of estrus and ovulation with that of standard. 1 or 2 injections of PGF2aa . Cows were divided randomly into three treatment groups as follows: Group 1 (OvSynch): GnRH (Day 0. 50 μμg im). PGF2aa (Day 7. 500 μμg im). G n RH (Day 9, 50μμg im). TAl 8 - 20 h later: Group 2 (GnRH – PGF2aa): Cows were synchronized using the same manner however. the second injection of GnRH was eliminated, AI 12 h after exhibiting estrus or at 80 - 96 h for cows which not displayed estrus; Group 3 (PGF 2aa): (Day 0. 500 μμg im). AI 12 h after detection of estrus or. if estrus not observed, cows received a second PGF2aa injection on Day 14, and AI 12 h after observed estrus or. at 80 - 96 h when estrus was absent. The results showed that conception rates at d 35 post AI was significantly (P<0.05) higher for cows in Group 2 (77.8%) than in Group 1 (63.6%) and Group 3 (50%). Similarly. Group 2 had a higher pregnancy rate (66.7; P<0.05) at d 65 post AI THAN Group 1(54.6%) and Group 3 (40%). Howeverوpregnancy losses did not differ among treated groups. Estimated saving in hormone costs required for synchronizing estrus and ovulation was LE 4.17 and LE 15.75 per pregnancy for Group 1 and 2, respectively. It could be concluded that GnRH-PGF2aa or GnRHPGF2aa-GnRH treatment was effective method for synchronizing a fertile estrus in postpartum subestrus lactating dairy cows. But, the better reproductive performance was observed in cows treated with GnRH-PGF2aa protocol.
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| Publication year |
2004
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| Pages |
797-811
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| Availability location |
معهد بحوث الانتاج الحيوانى-شارع نادى الصيد- الدقى - الجيزة
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| Availability number |
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| Organization Name |
Animal Production Research Institute (APRI)
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| City |
طنطا
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| serial title |
Journal Agricultural Research Tanta University
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| Author(s) from ARC |
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| External authors (outside ARC) |
ابراهيم محمود عبد الرازق
جامعة طنطا
ابراهيم سعد الشماع
جامعة طنطا
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| Agris Categories |
Animal physiology - Reproduction
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AGROVOC
TERMS |
Dairy cows.
Gnrh.
Ovulation.
Perinatal period.
Synchronization.
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| Proposed Agrovoc |
estrus;
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| Publication Type |
Journal
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