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Effect of Oral Administration of Sodium Fluoride on Food and Water Utilisation in Silkworm, Bombyx mori L Texte intégral
1999
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.
Afficher plus [+] Moins [-]Effects of water content in the artificial diet on the larval growth, cocoon quality and food utilization in the silkworm, Bombyx mori
1996
Machida, J. (Gunma-ken. Sericultural Experiment Station, Maebashi (Japan)) | Toyoda, Y. | Hirayama, C. | Konno, K. | Shinbo, H.
The effect of diet water content on the growth, cocoon quality and food utilization of the silkworm was investigated. The body weight of mature larvae increased greatly as the water content increased, and the weight increase was mainly due to the increase of water content of larvae. The diet water content was less effective on the water content of pupae than on that of mature larvae. The water content of feces increased progressively as the fifth-instar larvae grew, especially in the larvae fed with diets having high contents of water. The suitable water content in the diet ranged from 60 to 65% for the cocoon quality, although it was found to be somewhat different between the 2 silkworm races used. On the basis of the above results, we tried to make a new type of artificial diet for the silkworm
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