The cunaxid predacious mite, Coleoscirus horidula (Tseng) was extracted from leaf litter under cotton field plants in Qalyubia Governorate associated with spider mites, nematodes, scale insects as well as other small arthropods. The biological aspects of the predatory mite, C. horidula was determined on two preys, the free living nematode Rhabditis scanica Allegen and the acarid mite Tyrophagus putrescentiae (Schrank) at four different temperature degrees (20, 25, 30, 35°C) and 65-70 ± 5% RH. The predator passed through three nymphal stages, also the predator developed faster when reared at 35°C than 20°C. Obtained data showed that the type of prey and temperature affected significantly on biology of male and female of C. horidula. As it prolonged C. horidula life cycle, generation, longevity and life span when fed on free living nematodes R. scanica at 20ºC, while it was significantly decreased when fed on motile stages of acarid mite T. putrescentiae at 35ºC, as the periods decreased. Fecundity was significantly higher when the female fed on free-living nematodes recording 98.83 eggs/ female at 25°C and decreased to record the lowest number of deposited eggs at 35°C as 45.67 eggs/ female on the same prey.
The aim of this research was to conduct a study on the economic feasibility of a mixed cow production project by estimating the expected investment and operational costs of the project, estimating the expected revenues and returns for the project, calculating the project's financial and economic evaluation indicators using discounted and non-discounted measures, and analyzing the project's sensitivity to unfavorable conditions. The financial analysis of the mixed beef production farms, of the first, second and third categories, indicated that the internal rate of return for these projects was estimated at about 18.97%, 17.82% and 18.93%, respectively. The study recommended the encouragement of investors to enter the field of fattening mixed cow calves and working to reduce the imported quantities of both meat and fish. The study also recommended facilitating lending processes for graduates who are interested in desert land reclamation and increased the productivity of meat-producing animals through genetic improvement, improvement of breeding systems, and nutrition and veterinary care. The study also mentioned the role of agricultural cooperatives in providing concentrated feed, and attention to the role of scientific research in fattening livestock to bridge the gap in meat production.
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