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Öğe Effects of Dietary Levels of Vitamin a on the Egg Yield and Immune Responses of Laying Hens(POULTRY SCIENCE ASSOC INC, 1998) Coşkun, B.; İnal, F.; Çelik, İ.; Erganiş, O.; Tiftik, A. M.; Kurtoğlu, F.; Kuyucuoğlu, Y.This research, which was designed and carried out as two consecutive experiments, investigated the effects of four different levels (0, 4,000, 12,000, and 24,000 IU/kg) of vitamin A supplementation on egg yield, plasma vitamin A levels, and immune responses of laying hens. Transmission of maternal immunity to their descendants was also studied. In the first experiment, egg yield, blood vitamin A levels, and various parameters of the immune system such as T lymphocyte levels in the peripheral blood, plasma cell counts in the spleen, and antibody titers against Newcastle Disease Virus (NDV) in the sera were investigated for a l-yr period. A total of 864 Hisex-brown laying hens were used in this experiment. The chicks were reared as commercial flocks until the 18th wk of age. No significant differences occurred among the parameters of the different diet groups. In the second experiment, maternal immunity was assessed in the chickens, supplied by hatching the eggs from hens in the first experiment. Maternal immunity was assayed by using the parameters as in Experiment 1. For this purpose, both blood and tissue samples were taken on the 2nd, 7th, and 10th d posthatch. Vitamin A supplementation had no significant effects on maternally, derived antibody titers or histologic structure of the lymphoid organs.Öğe The Effects of Various Level of Vitamin E on the Immunity and Egg Yield of Laying Hens(1997) Coşkun, B.; İnal, F.; Erganiş, O.; Kuyucuoğlu, Y.; Ok, U.; Çelik, I.; Tiftik, A. M.This research was carried out in two experiments. In first experiment, four different levels of vitamin E (0. 5, 35 and 70 IU/kg feed) were added the diets based on corn, and the effects of the diets on egg yields, blood vitamin E levels, T-lymphocyte percentage, plasma cell count in spleen and antibody titers against the vaccine of Newcastle disease were investigated for one years. Total of 864 laying hens were used in this experiment. The mean egg yields of the experimental groups were 79.9, 80.6, 77.2 and 79.5% (P>0.05) and feed consumptions for one kg egg were 2.23, 2.23, 2.36 and 2.20 kg (P<0.05). No significant differences among groups found in blood vitamin E levels and histologic and immunologic results. In the second experiment twentyfour chick for each group were supplied by hatching eggs from the hens used in experiment I in order to investigate maternal immunity. Antibody titers were determined at day 2, 7 and 10. At same day, for histologic investigation, blood and some lenfoid tissue samples from spleen, bursa Fabricii, tymus and ileum were taken at same days the effects of different vitamin E levels were not significant on the antibody titers and histologic results.Öğe An in Vitro Test Model for Investigation of Disinfection of Dentinal Tubules Infected with Enterococcus Faecalis(1997) Tanrıverdi, F.; Esener, T.; Erganiş, O.; Belli, S.The aim of the present study was to develop an in vitro test model from human teeth to comparatively examine antibacterial effectiveness of calcium hydroxide, parachlorophenol (PCP) and camphorated parachlorophenol (CPCP) against Enterococcus faecalis in infected root canals. Cylindrical dentin specimens were prepared from freshly extracted human maxillary anterior teeth. The specimens were inoculated with E. faecalis and then medicated with either CPCP, PCP or Ca(OH)2. The disinfecting efficacy of these agents was tested by collecting dentin chips from the inner ("canal") walls of the specimens and counting viable E. faecalis. The dentin chips were diluted and a classical bacterial count technique was used for recovery of E. faecalis strains of 5% sheep blood agar. The effectiveness of CPCP and PCP at one day was superior to the effectiveness of Ca(OH)2. In the three-day group, CPCP was the most effective, followed by Ca(OH)2. The experimental model used in this study may be useful for investigation of the effect of intracanal medicaments on microorganisms lodged in the root dentinal tubules.Öğe Suitability of Lactate-Dehydrogenase Activity and Somatic-Cell Counts of Milk for Detection of Subclinical Mastitis in Merino Ewes - Short Communication(AKADEMIAI KIADO, 1991) Nizamlıoğlu, M.; Erganiş, O.The relationship between somatic cell counts (SCC) and LDH activity in milk was examined in Turkey to find out the suitability of these variables for early detection of subclinical mastitis in Merino ewes. A significant positive correlation was found between LDH activity and SCC in ewes' milk. LDH activity in milk samples appeared to be a sensitive and specific indicator of subclinical mastitis in ewes: it was significantly higher in milk from inflamed (mastitic) udders than in normal milk.