Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Ground under pasture was not affected by the distribution of the land. The state, and not the clanship, was regarded as the owner of the common pastures. It made use of them in part for its own flocks and herds, which were intended for sacrifice and other purposes and were always kept up by means of the cattle-fines; and it gave to the possessors of cattle the privilege of driving them out upon the common pasture for a moderate payment (-scriptura-).
The right of pasturage on the public domains may have originally borne some relation -de facto- to the possession of land, but no connection -de jure- can ever have subsisted in Rome between the particular hides of land and a definite proportional use of the common pasture; because property could be acquired even by the μέτοικος, but the right to use the common pasture was only granted exceptionally to the --metoikos-- by the royal favour.
At this period, however, the public land seems to have held but a subordinate place in the national economy generally, for the original common pasturage was not perhaps very extensive, and the conquered territory was probably for the most part distributed immediately as arable land among the clans or at a later period among individuals.
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Reference address : https://www.ellopos.net/elpenor/rome/1-13-agriculture-trade-commerce.asp?pg=17