To Determine mature height based on Birth Height.

Add 10 inches to birth height for an estimate of mature adult height. 

Below is a chart that will give you a basic idea of what height your Mini Jersey or Mini cattle will mature at.

This chart is based on well fed well grown animals, it is likely to be inaccurate if the animal is underfed or stunted. As once the animal recieves proper nutrition it will grow to its full potential.