jarad-gava hana yuva haya ara-vara
tate tara vadha nahe, haya upakara
jarad-gava—old, invalid cows; hana—becoming; yuva—young; haya—become; ara-vara—again; tate—in that action; tara—his; vadha—killing; nahe—is not; haya—there is; upakara—benefit.
"The killing and rejuvenation of such old and invalid cows was not truly killing but an act of great benefit.
Link to this page: https://prabhupadabooks.com/cc/adi/17/162