If the jokey could weigh 126 pounds then what will be weight for horse?

This question doesn't make sense. There's no relationship between a "jokey" (presumably a jockey) and a horse's weight. A jockey's weight might influence the weight allowance of a horse in a race, but it doesn't determine the horse's weight.

Horses come in a wide range of sizes and weights.

To answer this question, you'd need more information, such as:

* What breed is the horse? Different breeds have different average weights.

* What is the horse's age and sex? Young horses and mares typically weigh less than older horses and stallions.

* Is the horse healthy? A horse's weight can be affected by its health and diet.

Let me know if you can provide any more information.