Table 6. Duration of non-production and piglets per sows per year

Classification	Non-production(days)	PSY(heads)
	Mean±SD	Mean±SD
Small farm	52.77±17.85a	19.04±1.90NS
Large fram	42.94±13.77b	21.62±1.57
Spring	49.10±14.9ab	21.00±1.33NS
Summer	38.95±13.24c	21.44±2.46
Fall	54.39±16.79a	20.49±1.95
Winter	45.36±16.49bc	20.82±1.62
Average	47.12±16.30	20.92±1.89

Values with different superscripts are significantly different (p<0.05).
Not significant (p>0.05).