• M Peter Marian

      Articles written in Proceedings – Animal Sciences

    • Production and utilization of frogs: an ecological view

      T J Pandian M Peter Marian

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      The frog producing area in India has been doubled (23–51 million ha) during the last 30 years, while the frog harvest has also been consistently increased by the biology education (3–18 million frogs) and export (17–60 million frogs) sectors. The carrying capacity of the irrigated land is in the range of 28 frogs/ha and a 7% harvest of the population may represent the optimal utilization. Frogs do control agricultural pests but not vectors like mosquitoes. A ban on the frog export from India would mean the loss of not only a revenue of 10 million US dollars/annum but also the jobs for 0–16 million villagers. The need for development of mass culturing techniques of tadpoles, juvenile frogs and ranching of frogs is emphasized.

    • Prediction of absorption efficiency from food nitrogen in amphibians

      T J Pandian M Peter Marian

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      Gravimetric estimation of absorption efficiency in amphibians is a timeconsuming process and still subject to technical errors. The need for the application of indirect methods requiring no quantitative recovery of feces is indicated. From 41 values reported for 11 amphibian species, it is observed that nitrogen content of food is significantly (P<0·001) and positively correlated (>0·9) with absorption efficiency. From the obtained regression equation (absorption efficiency=49·615+4·596 nitrogen), the per cent efficiency can be predicted with 3·748 standard error.

    • Prediction of assimilation efficiency of lepidopterans

      T J Pandian M Peter Marian

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      From 206 values reported for over 60 lepidopteran species, it was found that nitrogen content of food shows a significant (P<0·001) and a positive correlation (r=0·704) to assimilation efficiency with standard error of 10·33. Unlike in aquatic animals, water content of food influences assimilation efficiency in these terrestrial lepidopterans; however, the relation between leaf water and assimilation efficiency is also correlated, but the correlation is lower than that (r=0·529; SE=11·8) obtained for leaf nitrogen. Considering the individual effect of water on assimilation efficiency as well as its covarying relation with nitrogen, leaf water was included as a co-predictor. The inclusion of leaf water as a co-predictor of leaf nitrogen content improves the precision of prediction (r=0·868; SE=9·7). The role of digestive reducing substances (e.g. Tannins) on assimilation efficiency was considered as a second co-predictor. Realising the difficulties of considering the digestive reducing substances as a second co-predictor, and observing the closeness of the observed and predicted values in the present study, nitrogen and water contents of leaf are considered as adequate explanatory variables for the prediction of assimilation efficiency.

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