Table 2. Total litter size and pigs at sucking in sow farms

Year\Traits	Litter sizes	No. of sucking
	Mean ± S.D	Mean ± S.D
1970	9.01 ± 1.45	8.75 ± 1.01
1980	9.12 ± 2.09	8.85 ± 1.82
1990	9.15 ± 1.48	9.00 ± 0.65
2000 (A)	10.05 ± 1.26	9.84 ± 0.62
2010	10.85 ± 1.47	9.90 ± 0.75
2018 (B)	11.50 ± 1.05	10.15 ± 0.69
Average	9.95 ± 1.47	9.42 ± 0.93
B/A (%)	14.43	3.15