| Titles |
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English :
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Dose time of breeding affect the incidence of early embryonic mortality and reproductive performance in buffalo
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Arabic :
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تأثير ميعاد التلقيح على معدلات النفوق المبكر للاجنة و الاداء التناسلى للجاموس خلال فترة ما بعد الوضع
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| Abstract |
This work aimed at studying the relationship between time of breeding and early embryonic losses in buffalo. The effect of this time on some reproductive traits was also studied. For that, 32 clinically normal buffalo calvers were used. All buffalo cows calved normally and no cases of retained placenta were recorded. Heat detection was performed throughout the 24-hours of the day-round using a TV closed circuit unit. Heat detection was started from the 10th day post-partum. A voluntary waiting period of 40 days was allowed to the dams before breeding. Blood samples were collected from the jagular vein at 5-days intervals for the determination of P 4 concentration. An additional blood sample was obtained on the day of estrus to confirm the occurrence of heat. In addition, a vasectomized buffalo bull was used as an aid for heat detection. The buffalo cows were randomly assigned into 4 groups according to the time of breeding. The dams of the comparable groups were bred at 3.0±t0.4 hrs (G1, n=9); 11.6± t0.5 hrs (G2. n=8); 16.2±t0.9 hrs (G3. n=7) and 24.7±1.1 hrs (G4. n=8) after the beginning of standing heat using a fertile buffalo bull. Rectal palpation was performed on the same days of blood sampling. Pregnancy was diagnosed per-rectum 45-60 days post service. The incidence of early embryonic losses was assessed on the basis of both rectal palpation results and P 4 concentration (when its level was sustained above 1 ng/ml for 45 days) after a successful service. then abrupt decline to < 0.5 ng did occur. The effect of time of breeding on the days-open, number heats to-conception, number of services/conception. conception rate and calving interval was also studied.
It has been shown that the incidence of early embryonic losses of this study was 9.4%. All cases of early embryonic losses were confined to G1 as the breeding were performed at an early stage of heat (after 3.0±0.4 hrs from the onset of standing estrus). This constituted 33.3% of the dams belonging to G1. No cases of embryonic losses were detected in G2, G3 and G4. The corresponding conception rates to the 1 5t service were 44.4, 100, 85.7 and 75% for the comparable groups. respectively. Too late breeding in G4 resulted in the highest days-open and longest calving interval.
It could be concluded that breeding buffalo too early during estrus may result in a higher incidence of early embryonic losses and inferior conception rate. Too late breeding may result in high days-open and long calving interval. Such that, in buffalo too early or too late breeding should be avoided. Optimum reproductive performance of buffalo could be achieved when breeding is to be applied 11-16 hrs after the beginning of estrus.
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| Publication year |
2005
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| Pages |
2359-2366
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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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| Country |
Egypt
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| City |
المنصورة
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| serial title |
Journal Agricultural Science
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| Volume |
30
. 5
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| Department |
Cattle Breeding Research Department
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| Author(s) from ARC |
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| External authors (outside ARC) |
ابراهيم عبد الحميد خليل
جامعة الزقازيق
عبد الكريم ابراهيم محمد
جامعة الزقازيق
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| Agris Categories |
Animal physiology - Reproduction
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AGROVOC
TERMS |
Breeding seasons.
Mortality.
Oestrus detection.
Performance testing.
Reproductive performance.
Water buffaloes.
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| Proposed Agrovoc |
early embryonic mortality;
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| Publication Type |
Journal
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