N.H. Rev. Stat. Ann. § 427:34

On and after June 30, 1960, no slaughterer may slaughter livestock except by a humane method. No person may handle livestock in connection with slaughter, or drive or transport them to holding pens or to place of slaughter except with a minimum of excitement and discomfort. Holding pens and transportation vehicles must be free from hazards which could cause suffering or pain.