Uganda's First Lady has declared that if cows can't be gay then humans definitely cannot be gay either.

Janet Museveni delivered the bewildering statement during a speech to the Church of Uganda's bishops to praise their work which had "progressed" the country.

Uganda recently passed an anti-gay bill, supported by the church, which will punish homosexual acts with life sentences.

"If cows did not practice homosexuality, how could we the human beings start arguing over homosexuality?" asked Museveni, who is also Minister for Affairs in the region of Karamoja.

Museveni stated that Uganda should follow God and not repeal the anti-gay law, after more than 50 civil society groups filed opposition petitions against the bill in Uganda's Constitutional Court last week.

"We must listen to God and obey him," she said. "Thank you God for leading us."