Effect of backfat loss during lactation on weaning-to-oestrus interval of sows at gonadotropin application /
A total of 984 primiparous and multiparous crossbred sows (Swedish Landrace x Large White) housed on a commercial pig farm were used to study the effect of the decrease in backfat thickness during lactatiton and the level of backfat at weaning on weaning-to-oestrus interval and conception rate of so...
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| Main Authors: | , , |
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| Format: | Book Chapter |
| Jezik: | English |
| Teme: | |
| Sorodne knjige/članki: | Vsebovano v:
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| Izvleček: | A total of 984 primiparous and multiparous crossbred sows (Swedish Landrace x Large White) housed on a commercial pig farm were used to study the effect of the decrease in backfat thickness during lactatiton and the level of backfat at weaning on weaning-to-oestrus interval and conception rate of sows. Primiparous sows (n 213)received a single injection of 400 IU eCG + 200 IU hCG (PG600, Intervet) at weaning and approximately 30 % of sows did not respond to the first treatment. First-farrowing sows produced significantly fewer live- born piglets, had markedly thinner backfat in late gestation, showed significant loss of backfat thickness during lactation and showed thinner backfat at weaning than sows with a greater number of parities. Primiparous sows with backfat thinner than 18 mm at weaning lost an average of 21 % of backfat during lactation and had a significantly longer weaning-to-oestrus interval (31.75+2.22 days), even after a second treatment with PG600, than both primiparous sows which responded to the first treatment (5.95+0.16 days) and multiparous sows which were not treated (5.19+0.12 days). The primiparousand multiparous sows with thicker backfat at farrowing also had thicker backfat at weaning (r=0.874 and r=0.938 for primiparous and multiparous sows,respectively). Sows with thicker backfat at weaning showed a shorter weaning-to-oestrus interval and this correlation was higher for primiparous than for multiparous sows (r=0.192 and r=-0.100, respectively). Thicker backfat of the sows at weaning was moderately but significantly correlated with lower loss of backfat during lactation (r=-0.179 and r=-0.273 for primiparous and multiparous sows, respectively). The present study showed that monitoring of backfat thickness and loss of backfat during lactation represents a usefull tool to decrease non-productive days and improve the efficiency of high-producing pig herds. |
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| Fizični opis: | str. 560-571. |
| ISSN: | 0003-9438 |