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Microscopic Anatomy of Sertoli and Leydig Cells During Fetal Development in Baladi Rabbit
Reda Mohamed,
Zein Adam,
Mohammed Gad,
Khalid Mazher
Issue:
Volume 2, Issue 1, March 2018
Pages:
1-5
Received:
26 November 2017
Accepted:
8 December 2017
Published:
10 January 2018
Abstract: Fifty three baladi rabbit embryos and fetuses were used in this study. The results revealed that the testicular differentiation occurred with the formation of the testicular cords with their constituents, gonocytes and primitive Sertoli cells at the 18th day postconception. The Sertoli cells were increased in number from 20th day postconception onwards and they appeared as small sized cells with oval darker nuclei. The Leydig cells were demonstrated at the 20th day of gestation life as clusters of polyhedral large cells with strongly acidophilic finely granular cytoplasm and large, vesicular, spherical and eccentric nuclei. At 28th day postconception up to the full term rabbit fetus, the Leydig cells of the testis showed a marked reduction in size and number.
Abstract: Fifty three baladi rabbit embryos and fetuses were used in this study. The results revealed that the testicular differentiation occurred with the formation of the testicular cords with their constituents, gonocytes and primitive Sertoli cells at the 18th day postconception. The Sertoli cells were increased in number from 20th day postconception onw...
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Isolation, Identification and Antimicrobial Susceptibility Test of Mastitis Causing Bacteria at Holeta Agricultural Research Center Dairy Farms
Kanenus Dereje Dereje,
Abriham Kebede,
Nigus Abebe,
Yobsan Tamiru
Issue:
Volume 2, Issue 1, March 2018
Pages:
6-13
Received:
17 November 2017
Accepted:
29 November 2017
Published:
17 January 2018
Abstract: A cross-sectional study was conducted from November 2014 to April 2015 to determine the prevalence of bovine mastitis, isolation of mastitis causing bacteria’s and characterize antimicrobial susceptibility pattern at Holeta Agricultural Research Centre (HARC) Dairy Farms. Purposive sampling technique was employed and all lactating cows were involved in the study. Among 186 lactating cows consists of 92 Jersey as well as 94 cross breed (Boran X Holistein Fresian) were included in the study. Among selected cows, 131 (70.43%) cows were identified as bovine mastitis positive and out of which 10 (5.37%) had clinical mastitis and 121 (65.05%) had subclinical mastitis. The different types of bacterial species isolated in present study includes S. aureus (30.93%), staphylococcus other than S. aureus (14.43%), Str. agalactiae (5.15%), Str. Dysgalactiae (5.15%), Str. Uberis (12.37%), C. bovis (13.40%), E. coli (6.18%), P. aerogenosa (10.3%) and K. pneumonie (2.05%). Antimicrobial susceptibility testing revealed that 94% and 78.6% of total isolates were susceptible to gentamycin and trimethoprim-sulfamethoxazole, respectively which was followed by erythromycin and tetracycline with susceptibility rate of 73.8% and 69%, respectively. However, penicillin had shown susceptibility of 55.9% which was the least effective among the drugs used. In conclusion, different types of mastitis causing pathogens with variable rate of susceptibility to antimicrobials were able to identify. Therefore, antimicrobial therapy should be used after isolation of the suspected pathogen to avoid emergence of drug resistance.
Abstract: A cross-sectional study was conducted from November 2014 to April 2015 to determine the prevalence of bovine mastitis, isolation of mastitis causing bacteria’s and characterize antimicrobial susceptibility pattern at Holeta Agricultural Research Centre (HARC) Dairy Farms. Purposive sampling technique was employed and all lactating cows were involve...
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About Some Features of the North Ossetian Populations of Greek Clouded Yellow (Colias aurorina Herrich-Schäffer, 1850)
Issue:
Volume 2, Issue 1, March 2018
Pages:
14-17
Received:
23 November 2017
Accepted:
6 December 2017
Published:
17 January 2018
Abstract: In North Ossetia populations of Greek Clouded Yellow which features and differences from other known populations were not studied so far were revealed. The purpose of this study was to learn the features of North Ossetia populations and their differences from the known populations in other parts of the area. It was used the reference practical standard of entomological material’s collecting - catching by air entomological net and registration – writing of field labels; of visual observations: route inspections, expeditions, maintaining the field diary and images taken with cameras. Geographical coordinates and absolute heights were measured by means of the Garmin etrex 20x GPS navigator. Determination of butterflies was carried out on external diagnostic signs the method of the comparative analysis was applied. It is established that North Ossetia populations of Greek Clouded Yellow differ from other North Caucasian populations in existence of yellow coloring females. This fact together with geographical isolation from other Caucasian populations of the species has confirmed the assumption that butterflies from North Ossetia fall into to special subspecies. Studying of one species features in various populations inhabiting different parts of the area is very important for the best knowledge of biological diversity.
Abstract: In North Ossetia populations of Greek Clouded Yellow which features and differences from other known populations were not studied so far were revealed. The purpose of this study was to learn the features of North Ossetia populations and their differences from the known populations in other parts of the area. It was used the reference practical stan...
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An Investigation of the Ectoparasites of Slaughtered Cattle at Keffi Abattoir in Nassarawa State of Nigeria, Sub-Sahara Africa
Mukhtar O. Adamu,
Abdullahi S. Onawo,
Fatimat O. Adebayo
Issue:
Volume 2, Issue 1, March 2018
Pages:
18-22
Received:
27 November 2017
Accepted:
9 December 2017
Published:
19 January 2018
Abstract: Ectoparasites represent a major source of livestock productivity loss. This study assessed different types as well as the predilection sites of ectoparasites on slaughtered cattle at Keffi abattoir. The fleas and lice were collected by combing the skin of the animal, while the ticks were carefully picked using a forceps. The ectoparasites found were preserved in 10% formalin in a sample tube and identified using standard techniques. A total of 300 cattle were surveyed, of which 202(67.33%) were infested with varieties of ectoparasites while 98(32.67%) were not infested. Nonetheless, 139(68.81%) of the cattle were infested with ticks of which 95(47.03%) represents Rhipicephalus spp. while only 44(21.78%) represents Amblyomma spp., while about one-fifth, 57(28.22%) of the infestation were caused by fleas; of which 39(19.31%) were of the Ctenocephalides canis while 18( 8.91%) were of the Ctenocephalides felis. However, 6(2.97%) of the infestation were due to Linognathus vituli specie of louse. Majority of the infestation were at the thigh, abdomen, neck and back. Using X2 analysis, the findings showed that there was a statistical significant difference between the prevalence of the ectoparasites by species, while no significant association was found with respect to the number of cattle infested by sex of the cattle surveyed and also by locations of survey. This study revealed a higher prevalence of ectoparasites of cattle in Keffi metropolis; infestation was found to be predominantly by two tick species: Amyblyomma spp. and Rhipicephalus spp. Thus cattle should be checked and treated regularly for ectoparasites as infestation may affect their health, productivity as well as the economic value of these animals.
Abstract: Ectoparasites represent a major source of livestock productivity loss. This study assessed different types as well as the predilection sites of ectoparasites on slaughtered cattle at Keffi abattoir. The fleas and lice were collected by combing the skin of the animal, while the ticks were carefully picked using a forceps. The ectoparasites found wer...
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