Okay kiddo, you know how some animals have eggs or babies inside their bodies that they need to take care of to make more of their kind? Well, there's something called the gonadosomatic index that helps us know how much of their body is used for this important job of making babies.
You see, some parts of an animal's body are used for things like moving or breathing or eating, while others are used for making little baby animals. The gonadosomatic index measures how much of their body is used just for making babies.
Scientists use this index to figure out if an animal is healthy and able to have babies. They can study different animals and see if they have different rates of using their body for making babies. This helps us understand more about how they live and grow.
So, gonadosomatic index may sound like a big and complicated word, but it's really just a way for us to measure how much of an animal's body is used for making babies. Pretty cool, huh?