The Mormon Church and the Boy Scouts of America formed a partnership 105 years ago based on shared beliefs in God, country and the necessity of teaching morals and responsibility to boys. The groups became so intertwined that one of every five Boy Scouts in the United States is Mormon, and all Mormon boys were expected to participate in scouting.

Now that arrangement is coming to an end. The Church of Jesus Christ of Latter-day Saints said Tuesday that it was severing ties with the Boy Scouts and would design its own youth programs that could be implemented in its congregations around the world. The decision, which was made jointly with the Boy Scouts, will take effect at the end of next year.

The change will also close the inequality in programming for Mormon boys and girls, a spokesman for the church said. The church had no scouting program for girls. Their church activities usually involved lessons in cooking, grooming, making handicrafts and learning the tenets of the faith, depending on the inclinations of the adults in charge.

“I have very mixed feelings about Scouts,” said Sumer Thurston Evans, the mother of two sets of boy-girl twins who has served as a Cub Scout leader. “I really love the Scouts and think it’s a good program that teaches good skills to the boys. But what broke my heart was the disparity between the boys’ programs and the girls’ programs.”