. ▁In ▁ 1 9 2 8 , ▁C J A ▁merged ▁with ▁the ▁Hum ane ▁S la ugh ter ▁of ▁Anim als ▁Association ▁to ▁become ▁the ▁Council ▁of ▁Justice ▁for ▁Anim als ▁and ▁the ▁Hum ane ▁S la ugh ter ▁Association , ▁which ▁is ▁most ▁often ▁called ▁" the ▁H SA ." . ▁On ▁ 1 ▁April ▁ 2 0 1 6 ▁the ▁Hum ane ▁S la ugh ter ▁Association ▁became ▁a ▁char itable ▁incorpor ated ▁organization ▁and ▁the ▁Council ▁of ▁Justice ▁for ▁Anim als ▁was ▁dropped ▁from ▁the ▁name . ▁ ▁In ▁the ▁early ▁ 1 9 2 0 s , ▁H SA ▁introduced ▁and ▁demonstrated ▁a ▁mechanical ▁st un ner , ▁which ▁led ▁to ▁the ▁ad option ▁of ▁hum ane ▁st unning ▁" by ▁ 2 8 ▁London ▁bor ough s ▁and ▁later ▁by ▁ 4 9 4 ▁other ▁local ▁authorities ." ▁H SA ▁helped ▁improve ▁water , ▁shelter , ▁and ▁handling ▁conditions ▁at ▁animal ▁mark ets . ▁It ▁lo bb ied ▁for ▁transport ing ▁cattle ▁by ▁train ▁instead ▁of ▁on ▁foot , ▁and ▁in ▁ 1 9 4 1 , ▁rail ▁lines ▁were ▁built ▁to ▁a ▁major ▁sla ugh ter house ▁for ▁this ▁reason . ▁ ▁H SA ▁played ▁a ▁key ▁role ▁in ▁passage ▁of ▁ ▁UK ' s ▁S la ugh ter ▁of ▁Anim als ▁Act ▁ 1 9 3 3 , ▁requiring ▁mechanical ▁st unning ▁of ▁c ows ▁and ▁elect rical ▁st unning ▁of ▁p igs ▁( The ▁law ▁ex cluded ▁p ig ▁facilities ▁without ▁electric ity