A main concern of reptile keepers is feeding food that
is high in calcium and low in phosphorous. This is essential as a
part of the way we prevent metabolic bone disease (MBD). The most commonly
fed insects are just the opposite...high in phosphorous and low in calcium.
Many dust the insects and worms with calcium powder to correct this.
While dusting works well, there is another method that
works better if done properly...Gut Loading. Gut loading is a term
for a technique for increasing the calcium content in an insects stomach
prior to feeding. There are many that feel this is worthless but research
shows that it is very effective.
The most common method is to feed the crickets,
mealworms superworms etc a high calcium food a day or two before feeding
the insects to the reptile. The most common food is calcium fortified
chicken egg laying mash.
A far better way is to raise the feeders on high calcium
food. I have found that greens such as turnip greens and dandelions are
great for this (the insects feces is actually bright green). I also feed
cactus powder and have made a "gel" out of cactus powder and agar that
serves as a water source as well as food. (For the recipe send me an email
using the contact form.) An added benefit is a more balanced amino acid
content and a higher omega 3 fatty acid.
In the wild insectivores and omnivores don't have the
calcium deficiencies that we see in captivity. I believe this is for 2
reasons. One is the insects don't live on wheat bran or corn meal. Instead
they eat a wide variety of food and greens. The other reason is the animals
eat a wide variety of bugs.
In captivity we can mimic this (to some degree) by
avoiding "mono" diets and gut loading.
References
Finke MD.
2002. Complete nutritional composition of commercially raised invertebrates
used as food for insectivores." Zoo Biology 21:269-285
INCREASING THE CALCIUM CONTENT OF
MEALWORMS (TENEBRIO MOLITOR) TO IMPROVE THEIR NUTRITIONAL VALUE
FOR BONE MINERALIZATION OF GROWING CHICKS
Issn: 1042-7260 Journal: Journal of Zoo and Wildlife Medicine
Volume: 31 Issue: 4 Pages: 512-517
Authors: Klasing, Kirk C., Thacker, Paul, Lopez, Melvin A.,
Calvert, Christopher C.
DOI: 10.1043/1042-7260(2000)031<0512:ITCCOM>2.0.CO;2
J Nutr. 1975 Aug;105(8):1071-5.
Essential dietary amino acids for growth of larvae of the yellow mealworm,
Tenebrio molitor L.
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