Egg Incubation

Last modified 05/16/2010


Troy Jones incubation method.

Here is how I did incubation back in 1998-2000


Get your incubator and plastic containers well ahead of when Uromastyx is expected to lay her eggs. Set up your incubator a few days to a few weeks ahead of time to make sure it will maintain temperature. Prepare your plastic containers, poke one small hole in the side or lid of the plastic container for oxygen exchange. Add large vermiculite to plastic container about half full. Add distilled water at a 5:1  vermiculite to distilled water weight ratio, add the distilled water to the bottom corner of the container with a syringe and cover the  distilled water with vermiculite.  The vermiculite in the containers will be almost dry. Be sure to weigh your trays with a digital scale for accuracy. Prior to adding eggs microwave the plastic containers filled with moist vermiculite for about 25 seconds, this will sterilize the vermiculite.

Fertile eggs have a distinct red circle visible at the time the eggs are laid. Orient the eggs in the container so the position the red circle is facing the same way the Uromastyx laid the egg, red circle is usually to the side or top of the egg and place the eggs into the plastic containers the same way they were laid.

Start the incubation temperature at 92 degrees for the first 30 days and then raise 93 degrees for the  duration. At the time of expected hatching raise the temperature to 94 degrees. Weigh your plastic containers once a week to track evaporation  levels, maintain 2:1 vermiculite to distilled water weight ratio. My first egg incubation plastic container this year contains 360 grams vermiculite and 180 grams of distilled water. The rubber made container and lid weigh 222 grams.. Container including eggs weighs 916 Grams. Vermiculite should be damp enough to clump up in your hands.  A day or two after eggs are added to plastic containers moisture should built up on the sides of the plastic containers if not you will need to add more water. Weight egg filled container weekly and add back how ever many grams evaporated that week. I also have placed an open container of distilled water at the bottom of the incubator to assist in humidity. Eggs should hatch out in 60-70 days.

This year I am going to use a Natures sprit incubator with a Herpstat proportional heating controller. I purchased it off of craigslist for $200.00.

This is my first year with the Natures sprit incubator, always in the past I used a Hova-bator, but this year I am expecting more eggs so I needing something that can handle several clutches. I will report my success or failure with my new incubator.


Mark Walsh incubation method;

Here is Mark Walsh incubation method Danny Molco ( The author of (Data from Wild Populations) Ornate Spiny Tailed-Lizards by Ben David Osnat and Molco Danny (Copyright 1999)  feels that his method is the best.

05/14/2001 Mark Walsh egg incubation is as follows:

The substrate is a 50/50 mix of perillite and the fine vermiculite, I start with 60/40 ratio for the first two weeks and then let it dry to  70/30. A good tip, when getting the trays together, put them in the microwave for about 20 seconds, this will sterilize the substrate. Be sure to weigh your trays with a digital scale for accuracy. After adding the eggs cover the trays and leave one small hole (approx .125")for oxygen exchange. I start the eggs at 93 for the first 30 days and then go to 94 for the  duration. At the time of expected hatching I raise the temp to 95. I am currently using a Helix incubator which uses forced air heating, this helps keep the heat consistent through out the incubator. I keep the humidity at 80%, this keeps the trays from drying out  too fast and having to add water all the time.  It is a good idea to weigh your trays once a week to track evaporation  levels.
With all of this maintained, your eggs should hatch in approx. 60 days.


09/11/2009 Thomasi2 from Taiwan incubation method.

I use Hova incubator, but I don't use it's auto-heating system
I use heat tape to continue heating to maintain Temp to about 33~35*C
About humidity , out side the eggs container the water is filled so it's humidity is very high.
But in the container the humidity is very low , the weight of substrate : water about 5:1
almost dry, I also put the mix in the button and a little dry substrate on it
But in the late phase, especially when babies is coming out, I will add humidity or put some well moistened paper towel with the eggs.

Thomasi2 complete incubation method and pictures.


Anyway I had a lot of egg failures due to mold, either I got the vermiculite to moist and the eggs would mold or I would get them to dry and they would crash. For me repeating successful incubation even using the same method is hit and miss at best and I am still studding trying to get a method that I can repeat year after year.

If you have successfully hatched out Uromastyx and are willing to share your methods please email me and I will post it in this section of my web page. Please include your full name, what you hatched  out, how many times your method has worked for you, your success rate, what years you hatch out Uromastyx and describe your method is as much detail as possible. Send an email to troy@uroranch with incubation in the subject field. I am an believer in sharing information to better everyone's efforts to successfully hatch Uromastyx eggs. I appreciate those of you willing to share.

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