Modi's comments follow the stabbing to death in June of a 16-year-old boy accused of possessing beef on a train, the latest of an estimated 28 people killed in cow-related violence since 2010.
Most of the victims were killed after Modi and his Hindu nationalist party won elections three years ago.
India's opposition parties are likely to raise the issue of repeated attacks on Muslims by so-called cow vigilantes.
The slaughter of cows, considered holy by Hindus, is banned in most parts of India.
India's Supreme Court on July 11 overturned a government decree on the trade of cattle for slaughter, an order that threatened the country's multi-billion dollar meat and leather industry dominated by Muslims.
(Reporting by Mayank Bhardwaj, editing by Louise Heavens) ((email@example.com; +91-11-4954 8030; Reuters Messaging: firstname.lastname@example.org))
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