There is a lot of circumstancial evidence on the issue. If for example, we look at invertebrates, we can see that on analysis they are poor sources of vitamin A, yet vitamin A deficiencies are rare in the few cases where analysis have been done of the predators. Yet problems like spindly leg are virtually unreported in wild populations even in those that are being intensively studied or cases where wild populations have thier enviroment manipulated with the results followed but spindly leg is not an uncommon problem with captive bred anurans. On review, there is a lot of evidence (anecdotal and documented) of spindly leg or poor development in captive bred or maintained anurans due to deficiencies in vitamins like vitamin A... as a result we have tweaked the supplements to resolve this issue (even though we know that frogs don't get much preformed vitamin A unless they are consuming vertebrates).... In addition, it is well documented that the anurans in captivity tend to be obese as they are typically fed to excess with "high quality" prey species in a manner that results in little or no significant energy expenditures for foraging. (See this old thread for some discussion on how many flies are needed to meet the metabolic needs of a resting frog http://www.dendroboard.com/forum/food-feeding/9031-how-many-flies-mealtime.html ).Ed, so if I undstand you correctly, if we feed normally for lack of a better term, we will likely see less offspring however, reduce the chance of having potentional problems with eggs, tads, and froglets during developmental stages?
I ask as I keep very common species with extensive availability. I have no reason to try and speed up production as I don't keep frogs with a sole focus on breeding.
I have been feeding heavily, falsely believing that it was important to ensure that females get back those appropriate vitimins and minerals. How do I say this more simply ? I have assumed that frogs are going to lay and therefore it is my responsibility to ensure that they get the extra calories they need. Based on your commentary above, I may actually be supporting a potential problem go-forward.