How Important is grass variety for cattle

[marke985]

As I slowly increase my Thai Brahman herd, I'm curious about the importance of grass variety in their diet. 

 

Currently we cut and carry from 5 rai Ruzi and Mombasa Guinea grass. We also let them graze the rice fields after harvest and use rice straw when desperate.

 

I recently bought 12 rai and I am in the process putting up a barbwire fence and removing and plant/tree regrowth as the area was previously untamed forest.  My plan is to let cattle graze this area unsupervised.  I was going to plant more Ruzi and Purple Mombasa Guinea in this area and maybe leave a small section for natural grass (till the ground and dump a bunch of manure in the area as natural grass seeds are always in the manure).

 

I feel like letting them free graze the same grass as we cut and carry might overwhelm their taste for the grasses and the cattle won't care for it anymore.  Is there any truth to this?

 

Is there another grass anyone recommends that they've had success with.  I will also be planting 1 rai of Mulatto 2 grass this year to give it a try.

 

Irrigation is possible for dry season, but prefer not to irrigate the area.

 

Farm is in Kalasin, near Roi Et/Maha Sarakham border.

 

Thanks for any help, suggestions, or education.