<ref name="methana">{{id}} {{cite journal|last=|first=IPB|year=2014|title=Produksi Gas Metana (CH4) dari Feses Sapi FH Laktasi dengan Pakan Rumput Gajah dan Jerami Padi | url=http://journal.ipb.ac.id/index.php/ipthp/article/download/10812/8338 asd| others = |journal=Jurnal Ilmu Produksi dan Teknologi Hasil Peternakan|volume=3|issue=1|pages=40-44}}</ref>
Pada Motivasi religi, bervegetarianVegetarisme wajib bagi semua pemeluk [[Jainisme]] didasarkan pada prinsip tidak/tanpa kekerasan (ahimsa, secara harfiah "tidak melukai")<ref name="religi jains">{{cite web|title=Dietary code of practice amongst Jains|url=http://www.ivu.org/congress/2000/jainism.html|website=International Vegetarian Union (IVU)|accessdate=28 April 2015|archive-url=https://web.archive.org/web/20160109041232/http://www.ivu.org/congress/2000/jainism.html|archive-date=9 January 2016|dead-url=no|df=dmy-all}}</ref>, sedangkan dalam agama Hindu dan [[Mahāyāna|Budha Mahayana]] utamanya dilakukan oleh pe-syi'ar kitab suci dan otoritas keagamaan. <ref name="religi 1">{{cite book| last = Tähtinen| first = Unto| title = Ahimsa: Non-Violence in Indian Tradition | year = 1976| location = London| pages = 107–111| isbn = }}</ref><ref name="religi 2">{{cite book| last = Walters| first = Kerry S.| authorlink = Kerry S. Walters|author2=Lisa Portmess| title = Religious Vegetarianism From Hesiod to the Dalai Lama| year = 2001| location = Albany| pages = 37–91}}</ref>
