Evaluation of the survival and growth of two strains of Bullfrog (Rana catesbeiana Shaw, 1802) fed with different sources of fatty acids
Author: Wagner Pires Vaz (Currículo Lattes)
Supervisor: Dr Mario Roberto Chim Figueiredo
The highest mortality rates recorded in the farms are observed right after the metamorphosis when the imagos need to adapt to the new terrestrial life. At this stage the animals become carnivores and the diet can make a difference. The objective of this work was to evaluate the survival and growth of two bullfrog strains fed different sources of fatty acids. For this purpose, 120 specimens of bullfrog (Rana catesbeiana Shaw, 1802) with an initial average weight of 42.11 ± 11.87g were used, 60 monosex XX females, originating from the crossing of females reverted to male with normal females and 60 frogs common. After marking, the images were placed in 12 cages inside 6 greenhouses (2 cages per greenhouse) for a period of 15 days of adaptation, divided into XX and common.At the beginning of the experiment, the biometrics of the images were performed by measuring the total length and the initial weight. Biometrics were repeated every 10 days, always after a 24-hour fasting period. A diet containing 43.19% crude protein was served once a day, in the proportion of 5% of the live weight of the frogs, plus 1% (volume / weight) of oil and 25% (weight / weight) of larvae of Musca domestica. Soy, sunflower and cod oils were used, chosen for their composition in n-3 and n-6 fatty acids. The experiment lasted 60 days and there was no death of animals in this period. Common frogs treated with sunflower oil had less growth and weight gain than frogs. Monosex frogs achieved greater growth and weight gain than common frogs in all treatments.There was an interaction between the type of oil and the genetics of the animals, reflected in the performance of the monosex, whose growth and weight gain were not influenced by the oils used.