Formerly, housefly larvae was used in frog production systems
to make the food move. These insects are part of the natural food
of frogs, corresponding to 0.85% of dietary protein and to 83% of
digestibility of crude protein (Olvera-Novoa et al., 2007). The prejudice
and rejection by consumers are the main factors limiting the
use oflarvae on frog farms (Lima et al., 1999), and itis therefore necessary
to reduce the use of these insects for frog feeding (Real et al.,
2005). In the present study, we suggested a feeding strategy that
does not use housefly larvae. In addition to the cost of the production
of these insects, we showed that, during the production cycle
studied here, frogs fed ration and fly larvae in linear feeders exhibited
poorer productive performance than animals receiving only
ration in vibrating feeder tray. It is likely that the visual stimulation
of food by frogs fed the linear feeders was small. The movement of
food in linear feeders was noticeably lower than in vibrating feeder
tray, causing worst weight gain (198.91 ± 15.99 g), feed conversion
(1.31 ± 0,12) and specific growth rate (4.73 ± 0.16%/day) at the end
of the experimental period.
Formerly, housefly larvae was used in frog production systemsto make the food move. These insects are part of the natural foodof frogs, corresponding to 0.85% of dietary protein and to 83% ofdigestibility of crude protein (Olvera-Novoa et al., 2007). The prejudiceand rejection by consumers are the main factors limiting theuse oflarvae on frog farms (Lima et al., 1999), and itis therefore necessaryto reduce the use of these insects for frog feeding (Real et al.,2005). In the present study, we suggested a feeding strategy thatdoes not use housefly larvae. In addition to the cost of the productionof these insects, we showed that, during the production cyclestudied here, frogs fed ration and fly larvae in linear feeders exhibitedpoorer productive performance than animals receiving onlyration in vibrating feeder tray. It is likely that the visual stimulationof food by frogs fed the linear feeders was small. The movement offood in linear feeders was noticeably lower than in vibrating feedertray, causing worst weight gain (198.91 ± 15.99 g), feed conversion(1.31 ± 0,12) and specific growth rate (4.73 ± 0.16%/day) at the endof the experimental period.
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