| Titles |
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English :
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Some reproductive aspects of Egyptian
buffalo bulls.
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Arabic :
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بعض الاوجة التناسلية لطلائق الجاموس المصري.
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| Abstract |
Three separate studies were conducted at Mehallet Moussa Research Station, Animal production Research Institute/Agricultural Research Center/Ministry of Agriculture.. Despite multiplicity of these studies, all of them have been revolving in the area of studying the reproductive performance of growing and mature buffalo bulls under the Egyptian conditions.
Study I :
This study included the evaluation of the anatomical and histilogical development of male genital organs in 27 young and pubertal buffalo bulls representing the age interval extending from 1 to 24 months. The animal were allotted according their ages into nine comparable groups of three animal each. The groups represented the ages of 1,3,6,9,12,15,18,21, and 24 months respectively.
Blood plasma testosterone levels, development of mating behavior, age at penile separation and first donation of an ejaculate containing motile spermartozoa, all were also studied . The results of this study showed that juvenile buffalo bulls display an early andrological activity. Despite the age at first donation of semen by these bulls (24 months ) is considered late. Hence, that delay could simply be attributed to an impaired managerial conditions and sub-optimum nutritional status of the animals. Optimum feeding and professional management are the basic requirements for the achievement of early puberty and maturity in buffalo bulls. In effect, a longer reproductive life of these bulls could be achieved. It was also shown that the use of the measurement “ scrotal circumference “ could be rely-upon as an easy, applicable and accurate predictor for the reproductive potentials of the growing and pubertal buffalo bulls.
Study II:
The objective of this study was to evaluate the system of group-mating in buffalo as a system of breeding frequently used in many governmental and privet buffalo farms. This included the evaluation of sex drive, semen picture and fertility of group- mating buffalo bulls. The impact of season of the year on these parameters was also studied. Three tested buffalo bulls and 188 pre-examined mature females were involved in 10 fertility trials (mating groups). The fertility trials were distributed over the 4 seasons of the year. Prior to beginning of mating- groups of each season, the bulls were weighted (once), libido testing performed (twice) and semen evaluated (once). After the separation of bulls from the mating groups in each season, the bulls were weighted (once), clinical measurements taken (once) and semen tests performed (3 times during the first week after separation). The results showed that all semen characteristics were adversely affected under the system of breeding. Otherwise, the impact of season on semen characteristics studied lacked statistical significance. It was recommended that group- mating in buffalo may be suggested under very stipulated conditions (e.g., in the distant areas were AI facilities are lacking). Under such conditions, breeding buffalo in groups would be more eligible to use, provided that, buffalo bulls are available, breeding sires are carefully examined, buffalo cows are rigorously selected and management conditions are optimal. For best results, the number of females should not exceed 20 females/group, the period of sexual promiscuity is not more than 2 months, and finally, a suitable period of not less than one month of sexual rest should be given to the bulls before reuse.
It was concluded that group- mating in buffalo dose not suit the existing situation of the shortage of genetically tested buffalo bulls. Thus, AI should be the method of choice of breeding buffalo in Egypt.
Study III:
This study was conducted to evaluate a new untraditional method for freezing buffalo semen. The semen was collected from three tested buffalo bulls at the rate of 2 – 3 ejaculates (once) per week. The period of semen collection was 14 weeks. Freezing of semen was performed using a TRIS- based extender that previously prepared and kept frozen at –20oC. The extender had an osmotic pressure of 306 mOsm., pH of 6.8 and contained the final concentration of glycerol (5%). The processing of semen included the treatment of semen (initially) with one of the broad- spectra antibiotics (Cephapirin). The treated semen was then diluted, cooled to –5oC in 2-hours, frozen in the LN vapor and finally stored at –196oC. The percentages of sperm progressive motility were recorded at each step of semen processing, as well as, after storage periods of one day, one month and two months. For determination of post-thaw motility, a thawing rate of 39oC/30 sec. Was used. After two months of storage LN, additional thawing rates of 35oC/ 30 sec. And 72oC/10 sec. were used and compared with the ordinary rate (39oC/30 sec.). Sperm viability, livability and morphology were assessed. Fertility of frozen semen stored for at list one month was evaluated using 48 buffalo cows.
It was concluded that, the use of a tris-based extender with OP of 305 – 310mOsm/kg and pH of 6.8 is suitable for freezing buffalo semen. It was proved that buffalo sperm can withstand satisfactorily the addition of the extender containing the final level of glycerol (5%) at 35oC. The treatment of the neat of buffalo semen with 500 μg Cephapirin/ml for 5 min. is well afforded by buffalo sperm and did not impair the freezing results. The resulting conception rate from the first insemination (60.4%) in this study was considered satisfactory. The use of a pre-frozen extenders is an easy, efficient and economic method for freezing buffalo semen.
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| Publication year |
1996
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| Availability location |
مكتبة معهد بحوث الانتاج الحيوانى - شارع نادى الصيد - الدقى - الجيزة
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| Availability number |
505
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| Organization Name |
Buffalo Breeding Research Department
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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 |
Buffalo meat.
Bulls.
Genitalia.
Semen preservation.
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| Publication Type |
PhD Thesis
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