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Studies On The Immunosuppresive Role Of Unsatisfactory Managemental Factors In Broilers

By: Atta Bukhari | Dr.Muhammah Amin Sheikh.
Contributor(s): Dr.Haji Ahmad | Dr.Muhammad Akram Muneer | Faculty of Veterinary Sciences.
Material type: materialTypeLabelBookPublisher: 1998Subject(s): Department of MicrobiologyDDC classification: 0588,T Dissertation note: The project concerning "Studies on the immuno-suppressive role of unsatisfactory managemental factors in broilers" was primarily planned to know, on scientific basis, the detrimental effects of unfavourable managemental conditions on health and performance of broiler birds. The birds were exposed to the stress of irregular feed and water supply and their maintenance on wet litter. rphe influence of various stress factors was assessed through determining HI tirs of specific antibodies against ND virus, weight gain of body and of lymphoid organs. Prior to inducing stress, the birds of all the three treatment groups showed GMT of specific antibodies determined on 15th day of their age as 128.0 (Group A, irregular feed), 130.3 (Group B, irregular water), 129.3 (Group C, wet litter), which was quite similar to that of control group D, showing GMT of 128.6. At this stage the immune response of birds in various groups including control was almost uniform. The stress treatment was commenced on day 15 and the GMT values of all the treatment groups became inferior to control group on all the subsequent observation periods that is 22nd day (Group A, GMT 48.5, Group B 36.8, Group C 26.0, Group D 97.0), 38th day (Group A 13.6, Group B 8.0, Group C 5.3, Group D 48.5), 53rd day (Group A 9.2, Group B 5.3, Group C 4.6, Group D 18.4) of the age of birds. Amongst various stresses, wet litter exerted comparatively more harmful effects on immune competence of birds. Among the other two groups which were maintained at irregular water supply and irregular feed supply, the former had greater adverse influence on immune performance of the birds. The body weight gain determined on periods prior to induction of stress showed negligible variation amongst various groups of birds. However, after induction of stress, there was variation in weight gain in between control group and each treatment group. The wet litter displayed highest .adverse influence on weight gain as compared to other two treatments. Similarly, irregular water supply was more harmful as compared to irregular feed supply. With regard to the influence on weight of lymphoici organs, the birds in all the three treatment groups had lesser values for the mean weights of bursa of Fabricius, thymus and spleen as compared to control group D, as determined on 56th day of their age. The difference was statistically significant. The mean liver weights of all the three treatment groups were lesser than the control group D. The variation was statistically significant.
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The project concerning "Studies on the immuno-suppressive role of unsatisfactory managemental factors in broilers" was primarily planned to know, on scientific basis, the detrimental effects of unfavourable managemental conditions on health and performance of broiler birds. The birds were exposed to the stress of irregular feed and water supply and their maintenance on wet litter. rphe influence of various stress factors was assessed through determining HI tirs of specific antibodies against ND virus, weight gain of body and of lymphoid organs.

Prior to inducing stress, the birds of all the three treatment groups showed GMT of specific antibodies determined on 15th day of their age as 128.0 (Group A, irregular feed), 130.3 (Group B, irregular water), 129.3 (Group C, wet litter), which was quite similar to that of control group D, showing GMT of 128.6. At this stage the immune response of birds in various groups including control was almost uniform. The stress treatment was commenced on day 15 and the GMT values of all the treatment groups became inferior to control group on all the subsequent observation periods that is 22nd day (Group A, GMT 48.5, Group B 36.8, Group C 26.0, Group D 97.0), 38th day (Group A 13.6, Group B 8.0, Group C 5.3, Group D 48.5), 53rd day (Group A 9.2, Group B 5.3, Group C 4.6, Group D 18.4) of the age of birds. Amongst various stresses, wet litter exerted comparatively more harmful effects on immune competence of birds. Among the other two groups which were maintained at irregular water supply and irregular feed supply, the former had greater adverse influence on immune performance of the birds.

The body weight gain determined on periods prior to induction of stress showed negligible variation amongst various groups of birds. However, after induction of stress, there was variation in weight gain in between control group and each treatment group. The wet litter displayed highest .adverse influence on weight gain as compared to other two treatments. Similarly, irregular water supply was more harmful as compared to irregular feed supply. With regard to the influence on weight of lymphoici organs, the birds in all the three treatment groups had lesser values for the mean weights of bursa of Fabricius, thymus and spleen as compared to control group D, as determined on 56th day of their age. The difference was statistically significant. The mean liver weights of all the three treatment groups were lesser than the control group D. The variation was statistically significant.

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