Abstract
This study was carried out to investigate reproductive performances according to sow farm sizes and farrowing seasons from 2014 to 2015. Data recorded by sow farms size and seasons were collected and analyzed with SPSS program (ver. 17.0). Items surveyed in different farms were heating rate after weaning, farrowing cycle per year, conception rate, mummification rate, interval of parturition, duration for non-production, piglets from sow per year (psy), etc. The heating rates for 7 days and 4〜6 days after weaning were 83.67% and 82.54%, respectively. The heating rate within 7 days after weaning in small farms (85.69%) was significantly higher than that in large farms (82.17%; p<0.05). The difference within 4 seasons was significantly found in heating rate(p<0.05). The average parity of sow farms was 4.27. The significant difference were not shown in farm sizes and seasons. The farrowing cycles of sow for year were 2.26 times. The large farms of 2.30 times were significantly higher than small farms of 2.22 times (p<0.05). The farrowing cycles in summer at 2.32 times was superior to that in other seasons (p<0.05). The average of conception was 81.5%. The conception of large farm at 84.29% was superior to that of small farms at 77.78% (p<0.05). The conception in spring (86.51%) is superior to that in other seasons (p<0.05) The difference of mummification rate by farm sizes was significantly shown (p<0.05). The average of farrowing interval were 154.30 days. The farrowing intervals of small and large farms were 158.65 and 151.41 days (p<0.05). The difference according to farrowing seasons is statistically significant (p<0.05). The average duration of non-production was 47.12 days. The length of non-production in small farms (52.77 days) is larger than that in large farms (42.94 days; p<0.05). The differnece by seasons for duration of non-production was significantly shown (p<0.05). The piglets per sow per year averaged 20.92 heads. The difference by farm sizes and seasons were not shown significantly.
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