<P> After cows are goats, with 20% raised in the north, 58% in Central Mexico and 22% in the south . Most of these goats are criollos, descendants of those the Spanish brought with Nubian, Alpino and Saanen breeds being introduced . Seventy five percent of dairy goats are raised in Coahuila, Durango and Guanajuato . About two thirds of meat production is on eight states in various parts of Mexico . Following goats are sheep with 16% raised in the north, 60% in central Mexico and 24% in the south . Criollo and Rambouillet are dominant in the north, with Suffolk and Hampshire dominating since their introduction in the 1970s in central Mexico . In southern Mexico breeds for tropical areas such as Pelibuey, Black - belly and Katahdin increasingly dominate . </P> <P> As natural pasture is not enough to support modern commercial livestock production, animal feed is produced as a crop or as a measure to enhance natural pastures . The former has increased since the 1990s and latter has increased more recently with government encouragement, especially in central and northern Mexico . In many areas, land used for the production of animal fodder, such as sorghum, is replacing that used for the growing of corn for human consumption . </P> <Table> <Tr> <Td> </Td> <Td> Wikimedia Commons has media related to Agriculture in Mexico . </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> Wikimedia Commons has media related to Agriculture in Mexico . </Td> </Tr>

In which region would irrigation systems be particularly important for early north america