P.R. Laws tit. 31, § 1549
If the usufruct be established on cattle of any kind, the usufructuary shall be obliged to replace, with the young thereof, those that die during each year through natural causes or are missing by reason of the rapacity of beasts of prey.
If the said cattle on which the usufruct is established shall all perish without any fault of the usufructuary, on account of any contagious disease or any other uncommon occurrence, the usufructuary shall fulfill his obligation by the delivery to the owner of the remains saved from such occurrence.
Should the cattle perish in part, also through accident, and without the fault of the usufructuary, the usufruct shall continue on the part saved.
If the usufruct is of sterile cattle, it shall be considered, in its effects, as if constituted on consumable property.
History —Civil Code, 1930, § 427.