That lush pasture may harm your animal

Dear Daktari,

I have some animals that I keep on my four acres of land. They graze freely around the land. But the drought had affected this forcing me to supplement with hay and sugarcane tops; which was costly and still production was not optimum. Luckily the rains are here, and I am happy that grass has sprouted. Now my animals have a lot of grass to feast on. Despite that abundance, I have noted that milk production is not optimal. I realised most of the animals have diarrhoea and late in the afternoon they get a lot of stomach distention (abnormally swollen outward).