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Posted by EdK on April 14, 2003 at 21:28:28:
In Reply to: Re: Horned frog study posted by snakeguy88 on April 14, 2003 at 16:02:18:
Actually they are not all anurans, a fair proportion of these are anurans but a significant amount of the diet are passarine birds, snakes and rodents (see Duellman, William E., Lizana, Miguel, 1994, Biology of a sit-and-wait predator, the Leptodactylid frog Ceratophyrys cornuta, Herpetologica 50(1):51-64) ,.
Consider that even in anurans the fat bodies can take up to 20% of the total body weight of the frog (Duellman and Trueb, Biology of Amphibians) which is a very high fat content in the diet.
So given that above what kind of fat are you referring to that is so detrimental to the amphibian later in life?
It appears that you are referring to cholesterol. If you look at the thread below on mice and fat you can look at the calculations on the caloric content and fat content versus crickets. Crickets and other cultured invertebrates have cholesterol in them to the extent that it has been linked with corneal lipidosis (Amphibian Medicine and Captive Husbandry, 2002). If you are referring to warm water fish such as gold fish, yes these are not the best feeder item for anything for several reasons and one of them being a high saturated fat content. Cold water fish (such as silver sides and rosey reds) and many marine fish (such as silver sides) have a higher unsaturated fat content and are acceptable food items for the forgs. Adult mice that are no longer reproductive have a high fat content and should probably be avoided but a regular adult mouse is not that bad when it comes to caloric content (actually less than a cricket on a kcal/gram basis.) (However agian the high vitamin A content needs to be addressed).
:Vertebrates do make up 90% of a wild horned frogs diet, yet these are all caudates, mostly of the same species. One example is Bartlett, and you can ask Colchicine about another source. I believe it was found that mice and fish contain a different sort of fat than the other frogs which directly led to the build up. Sorry I do not have direct listings for most of it. Andy