Pradyumna: In college if they start to study biology or zoology, it involves killing animals, dissection. Is that a sin?
Prabhupāda: Yes, certainly. You cannot kill even an ant.
Indian lady: Then you could give up such study?
Prabhupāda: That is your business. What can I say? (laughter) But any kind of animal killing is sin, sinful. (break) Kṛṣṇa says, sarva-yoniṣu sambhavanti mūrtayo yāḥ, tāsāṁ mahad yonir brahma ahaṁ bīja-pradaḥ pitā (BG 14.4). Kṛṣṇa says that "I am the seed-giving father of all living entities in any form." Sarva-yoniṣu. Sarva means all, 8,400,000 species and forms. So Kṛṣṇa is the father, and all living entities are part and parcel of the Lord. They have different dresses according to different karma, but actually, every living entity is part and parcel of God, sons. So suppose a father has got ten sons and one of them or two of them are useless. So if the elder brother wants to make some experiment by killing the younger brother, would the father be pleased? No. Father will be sorry even the intelligent boy is killed or the dull boy is killed. For father, there is no such distinction. Similarly, you cannot kill animals without being sanctioned. That sanction is in the sacrifice. I have already explained, for testing. According to Vedic system, if you kill anybody, then you must be responsible for the sinful life. (end)