The Islamist movement that backs President Mohamed Mursi gave 10 reasons why Muslim countries should "reject and condemn" the declaration, which the U.N. Commission on the Status of Women is racing to negotiate a consensus deal on by Friday.
The Brotherhood, whose Freedom and Justice Party propelled Mursi to power in June, posted the statement on its website, www.ikhwanweb.com, and the website of the party on Thursday.
Egypt has joined Iran, Russia and the Vatican - dubbed an "unholy alliance" by some diplomats - in threatening to derail the women's rights declaration by objecting to language on sexual, reproductive and gay rights.
The Muslim Brotherhood said the declaration would give "wives full rights to file legal complaints against husbands accusing them of rape or sexual harassment, obliging competent authorities to deal husbands punishments similar to those prescribed for raping or sexually harassing a stranger."
U.S. Ambassador Susan Rice last week touted at the commission - a global policy-making body created in 1946 for the advancement of women - progress made by the United States in reducing the rate of violence against women by their partners