Table 1. Distribution of sows by farm sizes and seasons in pig farms

Classification		No. of sows	Average of sows	No. of farms
Farm size	Small	120~200	170	5
	Large	230~900	385	6
Seasons	Spring	140~860	275	11
	Summer	130~900	286
	Fall	120~870	274
	Winter	125~850	271
Total		-	-	11