This study aims is to recognize some body organs of the Caspian miniature horse as a native Iranian breed. In this study, accessory sex glands of five adult Caspian miniature horses were studied by routine anatomical and histological methods. Anatomical study showed that accessory sex glands are similar to horse but its size is smaller.
In histological study, structure of accessory sex glands was similar to horse but the number of secretory units was less than that of the horse. Difference in glands size and abundance of their secretory units indicated semen volume in Caspian miniature horse is lesser than ordinary horse.