In his plea, Kumar has said that several breeds of indigenous cattle in the country are declining at a rapid pace as they are becoming uneconomical due to mechanization in agriculture.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/plea-ban-cattle-slaughter-ngt-issues-notice-states
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/slaughter-house
[4] http://admin.indiaenvironmentportal.org.in/thesaurus/national-green-tribunal-ngt
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/national-biodiversity-authority-nba
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/livestock
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/animal-care