The head of the Halal Certification Authority has declared "the white race will be extinct" in the next 40 years and therefore "Australian women need Muslim men to fertilise them".

Mohamed Elmouelhy's reasoning behind the comments is "to keep them [Australian women] surrounded by Muslim babies", and has caused backlash, News Corp has reported.

His comments come after a study by researchers from the Hebrew Univeristy - published in the journal Human Reproduction Update - found declining fertility rates among men in North America, Europe, Australia and New Zealand.

“According to the Hebrew University, Australian men [sic] sperm count has declined by 52 per cent over the last 40 years so your men are a dying breed," he wrote in a Facebook comment, which has since been deleted.

View photos Mr Elmouelhy caused controversy with his comments. Photo: Facebook More

"Australian women need us to fertilise them and keep them surrounded by Muslim babies while beer swilling, cigarette smoking, drug injecting can only dream of what Muslim men are capable of.

“If the country is left to the bigots the white race will be extinct in another 40 years. Muslims have a duty to make your women happy because you are declining, better go chose [sic] a plot for yourself at your local cemetery.

"If you can’t afford it, commit suicide it is a cheaper alternative for bigots.”

Mr Elmouelhy told news.com.au the post was intended to "stir the bigots" on his Facebook page.

“Last night 'Facelessbook' deleted the post, yet venomous messages devoid of any humour addressed to me about Islam remain published,” he wrote.

“You can see other messages from the bigots on other posts I have.”

The Muslim businessman called on these "bigots" to kill themselves or plan to die.

View photos Mr Elmouelhy posted this on Facebook. More

The study didn't explore reasons for the decline in sperm counts, but researchers cited links to certain checmicals and pesticides, smoking, stress and obesity.

Mr Elmouelhy's latest post comes just days after he predicted more non-Muslims in Australia would be eating more halal food than ever.