| Popis: |
Objectif: Cette etude vise a determiner les effets et les proportions acceptables d’un amendement a la poudre de coquilles d’escargots du substrat d’elevage susceptible d’induire de meilleures performances de croissance chez Achatina achatina . Methodologie et resultats: Deux cent vingt-cinq juveniles d’escargots A. achatina , âges de deux mois, de poids vif moyen 3,30 ± 1,00 g, de longueur moyenne de coquille 2,80 ± 0,33 cm et nourris exclusivement avec un aliment concentre (incorpore a 12 % de calcium alimentaire), ont ete eleves sur cinq types de substrats, durant 24 mois. Le substrat temoin S 0 est constitue uniquement de terreau. Les substrats S 10 , S 20 , S 30 et S 40 sont constitues de terreau amende respectivement a 10, 20, 30 et 40 % de poudre de coquilles d’escargots. Les resultats ont montre une difference significative (P < 0,05) entre les parametres de croissance observes sur les substrats amendes et ceux des substrats non amendes. Les meilleurs gains ponderaux et coquillers quotidiens ont ete obtenus sur le substrat S 20 (0,45 g/j ; 11,73 cm/j) contenant 5,04 % de calcium et 77,22 % de matiere organique. Conclusion et application des resultats: L’utilisation de la coquille d’escargot exploitee comme source de calcium pour l’amendement du substrat d’elevage peut maintenant etre envisagee en l’elevage des escargots geants africains. Toutefois, il est conseille de n’utiliser que les coquilles des escargots dont les etats de sante sont connus afin d’eviter toute contamination du substrat par des agents pathogenes. Mots-cles: Coquilles d’escargots, croissance, mollusques, substrats d’elevage English Abstract Objective: This study aims to determine the effects and acceptable proportions of an amendment with the powder of snail shells of the breeding substrate likely to induce better growth performance at Achatina achatina . Methodology and results: Two hundred and twenty five juvenile snails Achatina achatina of two months old with 3.30 ± 1.00 g average of live weight, 2.80 ± 0.33 cm average shell length and fed only to the concentrated diet (incorporated at 12% dietary calcium) were reared on five type of substrates for 24 months. The control substrate S 0 is only composed of loam. However, the substrates S 10 , S 20 , S 30 and S 40 are composed of loam amended respectively at 10, 20, 30 and 40% of powder snail shells. This, in the hope to determine the effects and best levels of an amendment to the breeding substrate can induce better growth performance. The results showed a significant difference (P < 0.05) between the growth parameters observed for the amended substrates and control substrate. The highest growth rates were achieved with the breeding substrate S 20 (0.45 g/j; 11.73 cm/j) containing 5.04% calcium and 77.22% organic matter. Conclusion and application of results: The use of the snail shell as a source of calcium for the amendment of the breeding substrate can now be considered in breeding African giant snails. However, it is advisable to use only the shells of the snails whose state of health is known in order to avoid any contamination of the substrate by pathogens. Keywords: Snail shells, growth, mollusc, breeding substrates |
