Question: query regarding a cow  showing the signs o decrease milk yield with a history of feeding of rice bran & green banana  from last two days -- 
Answer: - examine the animal for fever,tympany-[ melonex plus & afanil --if required ]  -- floraboost bolus -3 boli orally daily for 7 days , ostocalcium & vimeral 70-80 ml orally daily , papaya & smooth guprd can be incorporate in diet instead of green banana& rice bran , the cow shed should be keep warm up by making fire in side the shed [ the decline of milk may be due to cold stress ]