jarad-gava - old, invalid cows; hañā - becoming; yuvā - young; haya - become; āra-vāra - again; tāte - in that action; tāra - his; vadha - killing; nahe - is not; haya - there is; upakāra - benefit.

“The killing and rejuvenation of such old and invalid cows was not truly killing but an act of great benefit.