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Theses

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1977 - 19783
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Subject: Veterinary Parasitology × Author: KAU × End date: 1979 × Start date: 1975 × Type: Thesis ×
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    ThesisItemOpen Access
    Studies on the pathogenicity of tetrameres mohtedai and acuaria spiralis of fowl
    (Department of parasitology, College of Veterinary and Animal Sciences, Mannuthy, 1977) Ramaswamy, K; KAU; Sundaram, R K
    Controlled experiments were conducted at three levels of monospecific and dispecific infections with two commonly occurring spirurid worms of fowls viz. Tetrameres mohtedai and Acuaria spiralis. The blood studies conducted in monospecific T. mohtedai infection revealed a normocytic normochromic anaemia and eosinophilia during the initial phase and later a macrocytic anaemia, heterophilia and slight monocytosis by 66th day post infection. The infected birds lost considerable amount of their body weight. In layers there was a great delay in sexual maturity and poor feed efficiency as indicated by greatly reduced egg production. The percentage of establishment of worms in these experiments were found to be inversely proportional to the number of juveniles administered. The pathological changes in the affected proventriculi indicated an acute inflammation during the invasive phase of juveniles, followed by a chronic reaction which by 55th day post infection was well established indicating the development of a host – parasite balance towards the later stages of infection. Among the blood changes in monospecific A. spiralis infection, eosinophilia was evident initially followed by a marked leucopenia and development of a macrocytic hypochromic anaemia. Other effects due to parasitism were, delayed maturity, reduced rate of egg production, poor feed efficiency, loss of weight, emaciation and a mortality rate of 25% in chicks. The gross pathological changes in Acuariasis included the appearance of an irregular whitish patch on the serosa and formation of nodular growths in the mucosa which in heavy infections occupy the whole of the mucous membrane. Juveniles of A. spiralis were found to invade the compound glands in very heavy infections. The microscopic changes indicate a severe acute inflammation during the initial stages. Later as the disease became chronic pedunculated fibro – adenamatoid growths were evident on the mucous membrane. In dispecific infections with T. mohtedai and A. spiralis the haematological changes observed were eosinophilia during the early stages followed by a l eucopenia and heterophilia. As the disease progressed a macrocytic hypochromic anaemia developed. There was a great decrease in the live body weight of the infected birds. A mortality of 33.33% were observed in chicks with heavy infection. In layers the sexual maturity was delayed and egg production was greatly suppressed with consequent poor feed utilization. The gross and microscopic changes found in the affected proventriculi indicated a combination of lesions observed under monospecific infections of both the parasites. The results obtained show that the loss due to morbidity (mainly as a result of decreased body weight and reduced rate of egg production) was considerable. These facts indicate that both T. mohtedai and A. spiralis are economically important.
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    ThesisItemOpen Access
    Studies on the biology, pathogenicity and treatment of important nematodes of domestic duck
    (Department of Parasitology, College of Veterinary and Animal Sciences,Mannuthy, 1977) Chandrasekharan, K; KAU; Kalyanasundaram, R
    Studies on the incidence of nematode infections in 340 domestic ducks indicated that 67.94% of birds harboured one or more species of the following nematodes viz., Amidostomum globocaudata skrjabini , capillaria contorta, capillaria , Echinuria uncinate, Epomidiostum uncinatum, Eustrongylides papilosus, Strongyloides avium and tetramers antis. The rate of infection was highest in the case of Epomidiostomum uncinatum (41.86% ) and lowest in the case of strongyloides avium (0.59%). The lifecycles of Echinuria uncinata and Tetramers anatis were worked out in detail. It was established that Tetramers anatis was distinct from Tetramers Fissispina. The complete details of the morphology of juveniles both within the intermediate and final hosts were given. The juveniles of Echinuria uncinata completed the first and second moultings on the third and fifth day respectively and the stage juveiles reached infective stage on the seventh day following infection in Daphnia pulex at a room temperature ranging from 25 to 30C0. In ducklings the juveniles underwent the third and fourth moultings on the third and seventh day respectively and the eggs of the parasite were first found in the droppings on the thirty- third day. The juveniles of Tetramers anatis completed first mopulting on the third day, the second moulting on the fifth day and the third stage encysted in fat bodies of the grasshopper, Spathosternum prasiniferum. The third stage juveniles attained infective stage on the sixth day following infection. Within the ducklings, the parasite underwent the third moulting on the third day. The fourth moulting in respect of males was seen on the nineth day and in the case of females on the tenth day. The prepatent period of the parasite was found to be 24 days. Development of the juveniles was also noticed in five other species of grasshoppers viz., Oxya nitidula, Oedaleus abruptus, Conocephalus maculatus, Ducetia Japonica and Atractomorpha crenulata. No development of Tetrameres anatis, beyound the first stage was observed inDaphnia Pulex and Daphnia Magna on experimental infection. Anaemic changes with significant reduction in weight gain and haematological values were observed in experimental infections of Tetrameres anatis, Amidostomum skrjabini and Epomidiostomum uncinatum. Histopathological changes like haemorrahage, desquamation of cells, catarrbal inflammation and necrosis were seen in experimental tetramerosis. Ulceration and atrophy were also evident in amidostomiasis and epomidiostomiasis. The anthelmintic efficacy of 9 drugs against adult worms of Tetrameres anatis, Amidostomum skrjabini and Epomidiostomum uncinatum under experimental infections were determined. The efficacies against tetramerosis, amidostomiasis and epomidiostomiasis were 79.23%,32.15% and 79.88% with Tetramisole by drochloride at 50 mg/kg body weight; 70.36%, 52.42% and 50.23% with phenothiazine at 500 mg/kg; 26.85%, 74.8% and 65.68% with Morantel tartrate at 40mg/kg; 45.70% 67.29% and 57.84% with Parbendazole at 100 mg/kg; 41,0%’63/93% and 43.13% with Thiabendazole at 200 mg/kg; 59.28%,61.06% and 52.66% with Carbontetrachloride at 2ml/kg; 35.94%, 30,12% and 13.13% with Methyridine at 200 mg/kg; 28.87% 20.17% and 11.32% with Disophenol at 10 mg/kg and 31.02%, 39.04% and 12.66% with Cashewnut shell oil at 10 g/kg body weight respeectively. The drug Rametin at 200 mg/kg was found to be fatal to ducklings. In a cross infection trial delyed development and lesser percentage of establishement of Ascaridia galli of fowl origin were observed in ducklings as compared to chicks.
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    ThesisItemOpen Access
    Studies on the flies producing cutaneous myiasis in domestic animals in Trichur
    (Department of Parasitology, College of Veterinary and Animal Sciences, 1978) Subramanian, H; KAU; Raja Mohanan, K
    A detailed study on the incidence of cutaneous myiasis among domestic animals in Trichur, the morphology and biology of the causative flies and the efficacy of indigenous oils and chemicals as repellents against these flies were undertaken. Cutaneous myiasis was found common among domestic animals in Trichur during the months of October to May, the maximum number being, during January to March. The cases were observed in cattle, buffaloes, goats and dogs. The most common causative fly was Chrysomyia bezziana, but other flies such as Chrysomyia megacephala, Chrysomyia rufifacies and Lucilia cuprina were also observed. In cattle and buffaloes, the lesions were noted mostly in vulval lips and nasal septa where as in goats and dogs the cases were observed on the body skin. The flies of Chrysomyia megacephala, Chrysomyia rufifacies, Chrysomyia nigripes, Lucilia cuprina and Sarcophaga ruficornis were reared in the laboratory to study their morphology and biology. The larvae of Lucilia cuprina and Sarcophaga ruficornis were smooth. Chrysomyia bezziana, Chrysomyia megacephala and Chrysomyia nigripes were spiny and Chrysomyia rufifacies hairy. Chrysomyia rufifacies had the shortest life cycle period of 16 days and Sarcophaga ruficornis had the longest of 26 days. Lucilia cuprina could be reared in the laboratory for 71 days. The invitro development of the larvae, the development of the pupae and the process of fly emergence of Chrysomyia megacephala and Sarcophaga ruficornis were studied in detail. Among the fly repellents tested, lemongrass oil proved to be the best one in possessing fly repellent potentially followed by camphor in oil and Eucalyptus oil against blowflies and Sarcophaga species. Kerosine oil and Turpentine oil possessed the maximum larvicidal action on the larvae of Chrysomyia megacephala and Sarcophaga ruficornis. Turpentine oil and pine oil possessed excellent ovicidal action on Lucilia cuprina eggs even on smearing.