http://www.humantruth.info/tags/animal_rights.html
Human Truth Foundation pages (4):
Dangers and Purposes of Vegetarian Diets: Beliefs, Causes, Economics and Health, in the following sections:
Time to Move On: Religion Has Cost Too Much: 4.4. Animal Welfare and Ritual Sacrifice
Animal Sacrifice and Blood Rituals in Traditional World Religions and Satanism
Legislation and Faith: Religious Rights and Religious Wrongs: 7.1. Ritual Animal Slaughter
Not from the Human Truth Foundation, but still relevant (2):