Table 3. The seasonal average pig production efficiency from two different farm 1 and farm 2, between 2021–2022

Farm 1	Spring	Summer	Fall	Winter
Number of sows	902	899	902	906
Farrowing rate (%)	91.27±1.86	88.2±6.26	85.4±4.13	85.6±4.86
Farrowing interval (day)	142.07±0.84	142.5±1.2	142.13±0.15	144.7±0.2
Litter size (total)	15.4	14.8±0.2	14.43±0.25	14.47±0.46
Litter size (alive)	13.87±0.12	13.6±0.17	13.4±0.26	13.3±0.35
Number of weaning piglets	12.17±0.06	12.13±0.32	12.07±0.32	11.9±0.35
LSY1)	2.44±0.21	2.43±0.01	2.45±0.08	2.52±0.02
PSY2)	29.63±0.21	29.43±0.67	29.7±1.15	29.93±0.59

Farm 2	Spring	Summer	Fall	Winter
Number of sows	964	969	933	963
Farrowing rate (%)	79.8±5.51	86.8±3.28	81.27±6.69	85.7±1.48
Farrowing interval (day)	153.13±0.45	151.5±2.35	154.8±1.74	153.33±0.55
Litter number (total)	12.53±0.4	12±0.1	12.2±0.2	12.33±0.42
Litter number (alive)	12.3±0.26	11.8±0.17	11.9±0.2	12.23±0.4
Number of weaning piglets	10.87±0.21	10.47±0.57	10.17±0.68	11.03±0.21
LSY	2.31±0.1	2.33±0.05	2.3±0.03	2.29±0.02
PSY	25.2±0.1	24.43±1.46	23.4±1.65	25.3±0.2

Abbreviations: LSY, litter per sow per year;
PSY, piglets per sow per year.