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Matches in UGent Biblio for { ?s ?p A reccuring problem of sows is inadequate feed intake throughout lactation in relation to their metabolic needs. Therefore, the present study compared the voluntary feed intake (VFI) of ad libitum fed sows with sows fed a frequently used restricted feeding scheme during the peripartal period. Circulating (an)orexigenic hormones were measured in relation to feeding scheme and body condition. Sows were divided into three condition groups: skinny (n=26, back fat at P2<16mm), normal (n=57, back fat at P2 16 to 22mm) and fat (n=30, back fat at P2>22mm). Half of the sows within each condition group were fed ad libitum (n=56) and the others were fed restricted (decreasing towards farrowing, increasing afterwards) from day 106 of gestation until day 7 of lactation. Blood samples of a subsample of sows (n=33 and n=34 for ad libitum and restricted sows, respectively) were taken on day 107, 109 and 112 of gestation and on day 1, 3 and 5 of lactation. The plasma samples were analysed for leptin, ghrelin and resistin. Results pointed out that VFI of ad libitum fed sows only droped from 7.2±0.3kg (mean±sem) on the day of parturition to an average of 4.2±0.3kg and increased rapidly afterwards to 7.8±0.2kg, regardless of body condition. For the feed-regulating hormones a time-dependent profile was observed throughout the peripartal period. Leptin increased gradually during the peripartal period except for a slight drop on day 1 of lactation (P<0.001). No differences in leptin profile between the two feeding strategies were detected, but fat sows tended to have higher leptin levels than normal or skinny sows (P=0.078). The ghrelin profile peaked on day 109 of gestation, decreased and rose again from day 1 of lactation onwards (P=0.003). Similar to the leptin profile no effect of feeding strategy could be detected. No influence of body condition on ghrelin levels was found. Finally, resistin profile gradually increased throughout the peripartal period (P<0.001) regardless of feeding strategy of the sows. However, the resistin profile of skinny sows was numerically higher than that of the other sows. Therefore, it can be concluded that during the peripartal period of sows, leptin, ghrelin, and resistin profiles evolve independent from the applied feeding scheme and are more related to the body condition of the sows. As the metabolic rate can depend on the body reserves of the sow, this is likely the explanation for the differences in both the leptin and resistin profiles between different condition groups. In contrast to previous reports, the present data give no support to the necessity of restricted feeding strategies for peripartal sows.. }

• aggregation abstract "A reccuring problem of sows is inadequate feed intake throughout lactation in relation to their metabolic needs. Therefore, the present study compared the voluntary feed intake (VFI) of ad libitum fed sows with sows fed a frequently used restricted feeding scheme during the peripartal period. Circulating (an)orexigenic hormones were measured in relation to feeding scheme and body condition. Sows were divided into three condition groups: skinny (n=26, back fat at P2<16mm), normal (n=57, back fat at P2 16 to 22mm) and fat (n=30, back fat at P2>22mm). Half of the sows within each condition group were fed ad libitum (n=56) and the others were fed restricted (decreasing towards farrowing, increasing afterwards) from day 106 of gestation until day 7 of lactation. Blood samples of a subsample of sows (n=33 and n=34 for ad libitum and restricted sows, respectively) were taken on day 107, 109 and 112 of gestation and on day 1, 3 and 5 of lactation. The plasma samples were analysed for leptin, ghrelin and resistin. Results pointed out that VFI of ad libitum fed sows only droped from 7.2±0.3kg (mean±sem) on the day of parturition to an average of 4.2±0.3kg and increased rapidly afterwards to 7.8±0.2kg, regardless of body condition. For the feed-regulating hormones a time-dependent profile was observed throughout the peripartal period. Leptin increased gradually during the peripartal period except for a slight drop on day 1 of lactation (P<0.001). No differences in leptin profile between the two feeding strategies were detected, but fat sows tended to have higher leptin levels than normal or skinny sows (P=0.078). The ghrelin profile peaked on day 109 of gestation, decreased and rose again from day 1 of lactation onwards (P=0.003). Similar to the leptin profile no effect of feeding strategy could be detected. No influence of body condition on ghrelin levels was found. Finally, resistin profile gradually increased throughout the peripartal period (P<0.001) regardless of feeding strategy of the sows. However, the resistin profile of skinny sows was numerically higher than that of the other sows. Therefore, it can be concluded that during the peripartal period of sows, leptin, ghrelin, and resistin profiles evolve independent from the applied feeding scheme and are more related to the body condition of the sows. As the metabolic rate can depend on the body reserves of the sow, this is likely the explanation for the differences in both the leptin and resistin profiles between different condition groups. In contrast to previous reports, the present data give no support to the necessity of restricted feeding strategies for peripartal sows.".