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Acta Veterinaria Scandinavica logoLink to Acta Veterinaria Scandinavica
. 1998 Jun 1;39(2):237–250. doi: 10.1186/BF03547796

Reproductive Performance Among Sows Group-Housed During Late Lactation

En studie av reproduktionsresultatet i ett grupphållningssystem för digivande suggor

F Hultén 19,, N Lundeheim 29, A-M Dalin 19, S Einarsson 19
PMCID: PMC8050683  PMID: 9787487

Abstract

Four farms (540 sows) that group-housed sows from 2 weeks of lactation until weaning (G-farms) and 3 farms (300 sows) — used as controls — that kept the sows individually penned throughout the 5- to 6-week-long lactation period (C-farms) were compared in terms of reproductive performance. All sows were crossbred Swedish Yorkshirex Swedish Landrace. Sows were kept in groups in the breeding section and were also grouped on deep litter in the dry-sow section on all farms. Batchwise farrowing routines were used on all farms, and batch size ranged between 8 and 22 sows. Fertility and culling data were collected in connection with monthly visits to the farms for 16 months. Among the older (≥ 5th parity) sows, litter sizes were significantly (p = 0.02) smaller in the G-farm group compared with the C-farm group. The percentage of sows mated within 10 days post weaning was lower (p<0.001) in the G-farm group than in the C-farm group, with the difference being most evident among the older (≥ 5th parity) sows. The frequency of repeat breeders among primiparous sows was similar in the 2 housing systems, but among the multiparous sows repeat-breeder frequency was higher (p = 0.04) in the G-farm group than in the C-farm group. In both groups, repeat-breeder frequency seemed to be highest from July to September. Repeat breeding/failure to farrow was a common reason for culling in the G-farm group. These results indicate that reproductive performance was impaired in the group-housing system. This impairment could have been due partly to the occurrence of lactational oestrus, which makes it difficult to maintain adequate routines for oestrous detection and mating/insemination.

Keywords: housing system, fertility, litter size, repeat breeding, culling

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