1. KAUTIR (Kerala Agricultural University Theses Information and Retrieval)
Permanent URI for this communityhttp://localhost:4000/handle/123456789/1
Browse
2 results
Search Results
Item Alternative sources of cytoplasmic male sterility and genetic analysis of fertility restoration in Rice (oryza Sativa L.)(Department of Pnimal Breeding and Genetics, College of Horticulture,Vellanikkara, 2001) Biju, S; Radakrishnan, V VInvestigation for alternative source of cytoplasmic male sterility suitable for warm humid tropical climatic conditions was conducted at Agricultural Research Station, Mannuthy and College of Horticulture, Vellanikkara (1998•• 2001). The study included the evolution of alternative source of cytoplasmic male sterility, potential CMS lines, screening of genotypes for fertility restoration and its genetic analysis. From the backcross experiments conducted, sterile cytoplasmic source was confirmed to be that of Bhadra and saline tolerant rice variety Vytila-3. The cytoplasmic nuclear interaction exhibited by various crosses studied, resulted in the manifestation of male sterility. The four cross combinations with Vytila-3 and Bhadra as cytoplasmic maternal sources exhibited increase in male sterility with each step of backcross. In the case of Vytila-3 x IR 36, 100 percentage male sterility was obtained in the F2BC3 generation. This points out the relevance of backcrossing to evolve fully male sterile line in other crosses also. With respect to grain yield and components, the highest positive gca effect was observed in Bhadra followed by Mattatriveni. Since the dominance variance of this character was greater than the additive genetic variance, there is scope for hybrid vigour exploitation. The estimation of heterosis in the case of hybrids produced was significant enough to explore the prospects of hybrid rice suited to warm humid tropics. Generation mean analysis revealed that the characters tillers at harvest, panicle length, spikelets per panicle, grain LIB ratio and pollen sterility percentage were controlled by both allelic contribution and its interactive effects and hence for improving the characters, hybridization followed by selection can be resorted to.Item Evaluation of husbandry practices in captive zoo mammals in Kerala(Department of Livestock Production Management, College of Veterinary and Animal Sciences, Mannuthy, 2002) Biju, S; Francis XavierHusbandry practices adopted for captive zoo mammals, were studied in the Government owned zoological gardens located at Thiruvananthapuram and Thrissur districts ofKerala State. The mammals in the zoos were classified into ten groups, based on the taxonomic position and food habits. In the feeding management studies, the different feed ingredients used to formulate the ration for these ten groups of mammals were recorded. The dry matter content of the ration was worked out. A comparative study was taken up between Thiruvananthapuram and Thrissur Zoos, in the feed ingredients as well as in the dry matter content of the ration in all the above ten groups of mammals. The management practices with regard to housing of animals were also observed. Cages and enclosures were provided for the animals and in most of the cases the floor was made of cement concrete. A comparison between the two zoos with regard to the substrate and the type of cage for the ten groups of mammals were also made. The environment enrichment methods adopted as well as the provisions for wallowing and perching were also observed and compared in the two zoos among the ten groups of mammals. Under the captive breeding observations in Thiruvananthapuram Zoo it was found that 23 different mammalian species were kept in breeding pairs though successful breeding were noticed in 19 of them. The animals which do not breed in captivity even when kept in pairs, were the Indian Porcupine, the Himalayan Black Bear, the Sloth Bear and the Jungle Cat. Whereas in Thrissur Zoo" 11 mammalian species were in breeding pairs and out of that eight species were successfully breeding. The Indian Porcupine, Small Indian Civet and the Camels in the zoos were not breeding, eventhough they were in pairs. Disease prevalence was another management practice studied. Parasitic diseases (44.68 per cent), infectious diseases (35.11 per cent), non-specific conditions (17.02 per cent) and neoplastic conditions (3.19 per cent) were observed in captive mammals in Thiruvananthapuram Zoo; and infectious conditions (59.32 per cent), neoplastic conditions (15.25 per cent), parasitic diseases (13.56 per cent) and non-specific conditions (11.87 per cent) were observed in Thrissur Zoo. Vaccinations were regularly done only in felids in Thiruvananthapuram Zoo and no vaccinations were done in Thrissur Zoo. Regular dewormings were done for all mammals in Thiruvananthapuram Zoo, but only in carnivores and Camels in Thrissur Zoo. The frequency of deworming varied between the species and did not conform to any scientific suggestions. Hygiene and sanitation showed that the enclosures in the zoos were cleaned daily in the morning, before the feeding of the animals. Along with that the feed and water troughs were also cleaned. The water pools were emptied, cleaned and refilled twice in a week. 'Benzalkonium chloride' solution was the disinfectant used in the zoos, and were occasionally used only in the carnivore and primate cages.