Question

give reasons to explain why the mausi community lost their grazing lands

Answer 1

they lost their grazing lands due the Forrest act which was passed by colonial government

Answer 2

hey ,
here is ur answer
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Δ  European countries tried to control territories in Africa and sliced up the region into different colonies. In 1885, Maasailand was cut in half with an international boundary between British, Kenya and German Tanganyika.

Δ  Subsequently, grazing lands were taken over for white settlement and the Maasais were pushed into a small area in southern Kenya and North Tanganyika.The Maasais lost about 60% of their pre-colonial lands. Help was given by the British Colonial Government in East Africa to peasant communities to expand cultivation and pasture lands were converted into cultivated fields.

Δ  Pastoralists were not allowed to enter these reserves.
They could neither hunt animals nor graze herds in these areas. Very often these reserves were in areas that had traditionally been regular grazing grounds for Maasai herds.

Δ This was all due to the forest act 

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hope it helped 
@chris#