Jigs are in 6/8 time which means there are 6 beats per measure and a eight note (Quaver) gets one beat.  For example, here is how you would count while playing a jig. The vertical lines separate measures. Typically in Irish music, we emphasize the FIRST and FOURTH beat in a jig. Listen to the Kesh Jig and say: 

ONE two three FOUR five six | ONE two three FOUR five six |

also try:

Pine-ap-ple-A-pri-cot | Pine-ap-ple-A-pri-cot | Pine-ap-ple-A-pri-cot |

The manuscript (written form) would look like this:

Jig Practice Tracks 

Kesh Jig Sheet Music (Click here to Download Kesh Jig PDF sheet music file)