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Articles by Z. Ahmed
Total Records ( 4 ) for Z. Ahmed
  M. Asif , S.Z. Mustafa , M. Asim , N.S.Kisana , M. Y. Mujahid , I. Ahmad and Z. Ahmed
  Thirteen genotypes developed for rainfed areas of Pakistan viz., NR-155, 97C027, SN-6, PR-72, BWL-9736, NR-149, 96R37, DN-14, V-97005, 95C004, NR-178, CHAKWAL-97, SN-16, were evaluated for stability of grain yield under twelve diverse environments. The interaction between the genotypes and environments (G X E interaction) was used as an index to determine the yield stability of genotypes under all the environments. Both predictable (linear) and unpredictable (non-linear) portions of variation were found to be significant indicating equal importance in determining the stability of grain yield. The genotypes "96R37" and SN-16" were the most adapted showing considerable good performance in the entire set of environments under study.
  M.A. Qureshi , R. Ali , M.A. Cheema , Z. Ahmed and H. Roth
  A study was conducted to measure baseline immunocompetence of Arbor Acre broiler chicks after the birds were raised on hyperimmune bovine colostrum product ‘Immunmilk®` for first 7 d of age. Immunological parameters measured were in vivo and in vitro lymphoproliferation, macrophage functions which included phagocytosis, nitric oxide production and E. coli clearance from circulation; and antibody response against SRBC. In addition, body weights (BW) and lymphoid organ weights were also determined. Immunmilk®-treated chicks exhibited significantly higher BW at 7 (18.1% heavier) and 13 d (26% heavier) of age when compared with the chickens in control group. In vitro lymphoproliferative response of blood leukocytes to Concanavalin-A was increased (P = 0.0024) while in vivo lymphoproliferation to Phytohemagglutinin-P was down-regulated (P ≤ 0.01) in Immunmilk®-treated group. Macrophage phagocytic potential against SRBC was significantly higher and nitric oxide production was reduced in macrophages from Immunmilk® treated chicks. Systemic E. coli clearance after i.v. challenge was much more rapid in Immunmilk®-treated chicks. Immunmilk® treatment also increased total and IgM anti-SRBC antibody levels (P ≤ 0.05) during secondary antibody response. The results of this study showed that Immunmilk® increased growth as well as immune performance of chickens as measured by humoral (antibody) response, mononuclear phagocytic system function as well as lymphoproliferation. However, inflammatory processes such as in vivo mitogen-induced T-lymphocyte proliferation and LPS-mediated nitric oxide production by macrophages were down regulated.
  J.Z. Khawaja , K. Naeem , Z. Ahmed and S. Ahmad
  Influenza is a highly contagious acute respiratory disease of avian origin that has caused epidemics and pandemics in humans for centuries. Among these avian influenza viruses (AIV), only serotypes H5 and H7 are considered highly pathogenic in poultry. However, serotype H9N2 has also been found to produce severe respiratory and reproductive tract infections in chickens. The previous studies have suggested that movement of poultry and wild birds play a major role in the spread of influenza viruses to distant areas in a country. The present study was carried out to monitor the prevalence of AIV in wild birds in certain areas of the Pakistan, which were free from infection during the outbreak of November 2003. In this regard, 7 wild bird species were selected and their blood, cloacal swabs and tissue samples were collected both for serological evaluation and virus isolation. The results indicated that antibodies to AIV serotype H9N2 were present in 10% of wild birds, whereas the virus was itself isolated only from 6.72% of the samples. These data provide the evidence regarding the wild birds as one of the major carrier of the AIV infection.
  M. Asif , M. Asim , M.Y. Mujahid , S.Z. Mustafa , N.S.Kisana , Z. Ahmed , I. Ahmad and M. Sohail
  Nine genotypes of wheat developed for rainfed areas of Pakistan viz., DN-18, NRL-9822, NR-200, V-99166, 98C013, V-3, PR-72, NR-181 and SN-7 were evaluated for stability of grain yield under seventeen diverse rainfed environments. The interaction between the genotypes and environments (G X E interaction) was used as an index to determine the yield stability of genotypes under all the environments during 2001-02. Both predictable (linear) and unpredictable (non-linear) portions of variation were found to be significant indicating equal importance in determining the stability of grain yield. The genotype V-99166 was the most adapted showing considerable good performance in the entire set of environments under study.
 
 
 
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