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Effect of Oral Administration of Sodium Fluoride on Food and Water Utilisation in Silkworm, Bombyx mori L.

Published online by Cambridge University Press:  19 September 2011

C. A. Aftab Ahamed  and
M. V. Chandrakala
C. A. Aftab Ahamed
Affiliation:
Karnataka State Sericulture Research and Development Institute, Thalaghattapura, Bangalore-560 062, Karnataka State, India
M. V. Chandrakala*
Affiliation:
Karnataka State Sericulture Research and Development Institute, Thalaghattapura, Bangalore-560 062, Karnataka State, India
*
Corresponding author: MVC.
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Abstract

The effect of fluoride on the food and dietary water intake and utilisation were studied in final instars of silkworm, Bombyx mori L. race NB4D2 fed ad libitum with mulberry leaves treated with sodium fluoride at concentrations of 25 ppm, 50 ppm and 75 ppm. The larval duration increased by two days while food consumption, assimilation rate, assimilation efficiency, feeding and metabolic rates increased significantly in all the treated larvae. On the other hand, the amount of faeces produced, food conversion, conversion rate and conversion efficiencies decreased significantly in all the treated batches when compared to controls. The water intake and utilisation parameters increased significantly while rate of water loss through faeces, water retained in the body and retention efficiency decreased in all the fluoride-treated silkworms. The factors responsible for these changes in treated batches are discussed in relation to the effect of fluoride on cocoon and shell weights.

Résumé

L'effet du fluorure sur la prise d'aliment et d'eau, de même que la mobilisation de ces éléments a été évalué chez les derniers stades larvaires de race NB4D2 du ver à soie, Bombyx mori L., nourries à volonté sur feuilles du mûrier traitées au fluorure de sodium et à la concentration de 25 ppm, 50 ppm et 75 ppm. La durée de l'état larvaire augmentait de deux jours tandis que la consommation alimentaire, le taux d'alimentation et d'assimilation, l'efficacité d'assimilation et le taux de métabolisme augmentait significativement dans les trois traitements. Cependant, la quantité produite de matières fécales, la nourriture assimilée, le taux et l'efficacité d'assimilation décroissaient significativement par rapport aux témoins. La prise d'eau et les paramètres de son utilisation augmentaient significativement au moment où les pertes en eau par voie de la matière fécale, l'eau par l'organisme et l'efficacité de rétention baissaient au sein des vers traités au fluorure. Les facteurs impliqués dans ces changements chez les groupes traités sont discutés en relation avec leur effet sur les poids des cocons et coquilles.

Keywords

bioenergeticsBombyx morisodium fluoridesubstances bio-énergétiquesBombyx morifluorure de sodium
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 19 , Issue 2-3 , September 1999 , pp. 193 - 198
Copyright
Copyright © ICIPE 1999

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