If you Cytoshape a Mountain Goat choosing Tarpan, then Mountain Goat has the ability "When ~this~ is put into a graveyard from play, you gain 1 life." Whenever a creature with a put-into-graveyard-from-play ability is put into a graeyard from play, that ability triggers. The fact the creature no longer has that ability when it hits the graveyard in of no consequence, because creatures don't have abilities in the graveyard anyway (unless the ability specifically says so).
410.10d Abilities that trigger on one or more permanents leaving play, or on a player losing control of a permanent, must be treated specially because the permanent with the ability may no longer be in play after the event. The game has to “look back in time” to determine what triggered. Each time an event removes from play or changes who controls one or more permanents, all the permanents in play just before the event (with continuous effects that existed at that time) are checked for trigger events that match what just left play or changed control.
Also, if a creature card is not a creature when it leaves play, it will not trigger Fecundity.