المستودع الرقمي لـقسم أمراض الدواجن والأسماك

This study was conducted to develop a short-term immersion procedure for masculinisation of Nile Tilapia (Oreochromis niloticus) by using 17α-methyltestosterone at 100, 200 or 400 µg l-1 for 3, 6 or 12 h. Fry were immersed two successive times with 3 days interval period. The highest percentage of male Oreochromis niloticus (96±4 %) and the lowest gonado-somatic index of female Oreochromis niloticus (1.89±0.02) were obtained by immersion of fry in 17α-methyltestosterone at the level of 400 µg l -1 for 6 h. However, survival rate of Oreochromis niloticus Fry during hormone treatment period did not differ significantly from survival rate in the control group. Tilapia culture is widespread all over the world. The problem of overpopulation in fish ponds caused by uncontrolled reproduction is a major constraint to the further development of the Tilapia culture industry. This problem could be overcamed by culturing all-male populations of Tilapia. One of the most common techniques for producing all-male populations of Tilapia is androgen-induced-sex-reversal by using androgen-treated feed. However, the immersion of fry is not fully developed for practical usage. Feeding androgen carries some potential disadvantages as in efficiency in masculinisation. Immersion of Tilapia fry in androgen solutions may be an alternative to oral administration of androgen, this technique is well developed in salmonid culture; however it remains largely experimental in Tilapia culture. The objective of this research was to develop short-term immersion procedure for the masculinisation of Nile Tilapia by using 17α-methyltestosterone and evaluating the most proper dose concentration and hormone treatment period.
ABDUSSALAM ABUMHARA(10-2009)

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Abdulwahab Kammon(1-2022)

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Abdulwahab Kammon(1-2010)

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Abdulwahab Kammon(1-2010)

The hepatotoxicity and nephrotoxicity of chlorpyrifos (CPF) and imidacloprid (IMC) insecticides were experimentally studied in layer chickens, taking into account the patho-biochemical alterations. The LD50 values estimated were 41 mg/kg bw and 104.1 mg/kg bw for CPF and IMC, respectively. The plasma cholineesterase enzyme was severely inhibited in chickens given a single dose of CPF at a rate of 55 mg/kg bw via oral gavage, while it remained unchanged in chickens given IMC at rate of 139 mg/kg bw via similar route. The activities of liver function enzymes viz. AKP, ALT and AST were significantly increased in chickens of CPF and IMC groups. Uric acid level was significantly increased and cholesterol level was only significantly reduced in the plasma of chickens administrated CPF. Plasma glucose values in chickens given CPF as well as in chickens given IMC were significantly increased at (P
Abdulwahab Kammon(1-2010)

Introduction: A total of 32 young (1-3 months-old) lambs suffered from mortal neurological signs in a period of three months. The lambs were among the offspring of a herd of 300 sheep, in Tarhouna city, Libya. The affected lambs were initially treated with antibiotics, multivitamins and mineral supplements, however, none of these treatments attenuated the death toll among the small lambs. Methods: Three lamb carcasses were submitted to the National Center for Animal Health (NCAH) for post mortem examination. Gross pathological examination of the brains detected hydatid cysts and yellowish lesions within the cerebral cortex. Results: The histopathologic examination of the brain showed the presence of inflammatory lesions and necrotic features surrounded by granulomatous inflammatory patterns, which are accompanied by a few parasitic cysts. Ordinary and modified Ziehl-Neelsen stains for bacterial infection were performed, but the results did not strongly indicate bacterial infection. Toxoplasmosis, particularly T. gondii, and Neospora were first suspected. Immunohistochemistry testing for T. gondii did not show any conclusive indication for the presence of this pathogen. However, meticulous microscopic examination (100x) of the histopathologic features and the patterns of host-pathogen interaction of toxoplasmosis indicate that these lambs may have suffered from necrotic encephalitis associated with a different type of toxoplasmosis.
Abdulwahab Kammon(10-2021)

An experiment was conducted to study chlorpyrifos chronic toxicity in broilers and the protective effect of vitamin C. Oral administration of 0.8 mg/kg body weight (bw) (1/50 LD50) chlorpyrifos (Radar®), produced mild diarrhea and gross lesions comprised of paleness, flaccid consistency and slightly enlargement of liver. Histopathologically, chlorpyrifos produced degenerative changes in various organs. Oral administration of 100 mg/kg bw vitamin C partially ameliorated the degenerative changes in kidney and heart. There was insignificant alteration in biochemical and haematological profiles. It is concluded that supplementation of vitamin C reduced the severity of lesions induced by chronic chlorpyrifos toxicity in broilers.
Abdulwahab Kammon(1-2022)

As attached
Abdulwahab Kammon(9-2010)