Some rat poisons contain a toxin that blocks the liver's ability to utilize vitamin k. animals that consume this poison would have problems with

The vitamin K is very important for the coagulation of the blood. In the absence of the vitamin K, the coagulation of the blood does not take place, as this vitamin is a very important coagulation factor.

In case, the liver's ability to utilize vitamin K is reduced, the body would not get a proper amount of vitamin K. Hence, the coagulation would not occur properly.

So, the correct answer is Blood Coagulation.