| Titles |
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English :
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Estrous and ovarian cyclicity of
Egyptian Buffaloes in relation to day light length and Melatonin
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Arabic :
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النشاط الدوري المبيض و الشبقى للجاموس المصري و علاقته بطول النهار الضوئي و مستوى الميلاتونين
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| Abstract |
This work was aiming to study the effect of day light on the reproduction
activity and its relation with melatonin concentration in blood. The practical work of this investigation was comparised of 4 experiments. Cyclic buffalo cows were used to study 1-The ovarian activity in relation to ambient temperature and day light length, 2-To determine the commenecement of the corpus luteum activity and relation to length of the ovulatory cycle through daily blood samples during the ovulatory cycle, and 3-To study the role of melatonin in reproductive seasonality of the Egyptian Buffaloes. The important results were:
-The percentage of animals showed ovarian activity during cold season was 71%. The average number of ovulation/cow was 5.9 in the cold season, While it was 43 in the hot one.The external symptoms of heat was more pronounced during the cold season.
-During the experimental season (S3) (extended light for 3hrs. during winter) animals showed a higher ovarian activity when compared to that of either natural winter (S1) or natural summer (S2), Since the average number of ovulation/cow was 3.3, 2.33 and 1.3, respectively. The length proestrus phase seems to be determintal of cycle length as calculated from daily progestrone samples. The melatonin concentration was significantly (p<0.01) higher during the night than that in the morning; however, no significantly differences among S1, S2 and S3 were detected.Follicular and luteal phases of the cycle appear to be unaffected by blood plasma melatonin.
Key words: Buffaloes, reproductive, melatonin.
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| Publication year |
1999
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| Pages |
130p.
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| Availability location |
مكتبة معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى- الجيزة
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| Availability number |
644
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| Organization Name |
Animal Production Research Institute (APRI)
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| Country |
Egypt
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| Department |
Buffalo Breeding Research Department
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| Author(s) from ARC |
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| Agris Categories |
Animal physiology - Reproduction
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AGROVOC
TERMS |
Light.
Melatonin.
Oestrous cycle.
Ovarian cysts.
Water buffaloes.
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| Publication Type |
PhD Thesis
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