Influence of Backfat Thickness and the Interval from Altrenogest Withdrawal to Estrus on Reproductive Performance of Gilts
Estrus synchronization of gilts can be achieved by feeding the orally active progestogen altrenogest (AT) to cycling gilts at 20 mg/day for 14 to 18 days with gilts usually returning to estrus 4 to 8 days after the last feeding. In practice, gilts failing to exhibit estrus by 6 days after AT withdra...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-05-01
|
| Series: | Animals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-2615/11/5/1348 |
| _version_ | 1797534808145920000 |
|---|---|
| author | Krittawat Thitachot Voramet Sirinopwong Viriya Seemuang Akkapon Ratchatasriprasert Roy N. Kirkwood Nutthee Am-in |
| author_facet | Krittawat Thitachot Voramet Sirinopwong Viriya Seemuang Akkapon Ratchatasriprasert Roy N. Kirkwood Nutthee Am-in |
| author_sort | Krittawat Thitachot |
| collection | DOAJ |
| description | Estrus synchronization of gilts can be achieved by feeding the orally active progestogen altrenogest (AT) to cycling gilts at 20 mg/day for 14 to 18 days with gilts usually returning to estrus 4 to 8 days after the last feeding. In practice, gilts failing to exhibit estrus by 6 days after AT withdrawal may compromise weekly breeding targets. The cause of prolonged intervals to estrus are unknown but may involve prolonged suppression due to the release of progesterone (P4), and by extension AT, from adipose tissues. The present study examined relationships between gilt P2 backfat depth (<13.5 mm, 14–16.5 mm, >17 mm groups), the AT withdrawal to estrus interval, and subsequent reproductive performance in gilts. We noted longer intervals to estrus in gilts with greater P2 backfat depths (<i>p</i> < 0.0001), and higher serum P4 concentrations on the last day of AT feeding and at estrus detection (<i>p</i> < 0.05). Total born litter sizes were unaffected by backfat depth, but pigs born alive progressively decreased with increasing backfat depth with the fattest gilts producing the fewest liveborn pigs (<i>p</i> < 0.05). Taken together, these data suggest that adipose tissues may provide a reservoir of steroid, with its release from fatter gilts having potential negative effects on their subsequent reproductive performance. |
| first_indexed | 2024-03-10T11:35:45Z |
| format | Article |
| id | doaj.art-8b81df376081472cb84c2375306556c0 |
| institution | Directory Open Access Journal |
| issn | 2076-2615 |
| language | English |
| last_indexed | 2024-03-10T11:35:45Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Animals |
| spelling | doaj.art-8b81df376081472cb84c2375306556c02023-11-21T18:55:20ZengMDPI AGAnimals2076-26152021-05-01115134810.3390/ani11051348Influence of Backfat Thickness and the Interval from Altrenogest Withdrawal to Estrus on Reproductive Performance of GiltsKrittawat Thitachot0Voramet Sirinopwong1Viriya Seemuang2Akkapon Ratchatasriprasert3Roy N. Kirkwood4Nutthee Am-in5Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, ThailandFaculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, ThailandFaculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, ThailandFaculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, ThailandSchool of Animal and Veterinary Sciences, University of Adelaide, Roseworthy, SA 5371, AustraliaDepartment of Obstetrics, Gynaecology and Reproduction, Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, ThailandEstrus synchronization of gilts can be achieved by feeding the orally active progestogen altrenogest (AT) to cycling gilts at 20 mg/day for 14 to 18 days with gilts usually returning to estrus 4 to 8 days after the last feeding. In practice, gilts failing to exhibit estrus by 6 days after AT withdrawal may compromise weekly breeding targets. The cause of prolonged intervals to estrus are unknown but may involve prolonged suppression due to the release of progesterone (P4), and by extension AT, from adipose tissues. The present study examined relationships between gilt P2 backfat depth (<13.5 mm, 14–16.5 mm, >17 mm groups), the AT withdrawal to estrus interval, and subsequent reproductive performance in gilts. We noted longer intervals to estrus in gilts with greater P2 backfat depths (<i>p</i> < 0.0001), and higher serum P4 concentrations on the last day of AT feeding and at estrus detection (<i>p</i> < 0.05). Total born litter sizes were unaffected by backfat depth, but pigs born alive progressively decreased with increasing backfat depth with the fattest gilts producing the fewest liveborn pigs (<i>p</i> < 0.05). Taken together, these data suggest that adipose tissues may provide a reservoir of steroid, with its release from fatter gilts having potential negative effects on their subsequent reproductive performance.https://www.mdpi.com/2076-2615/11/5/1348giltsaltrenogestbackfat depthfertility |
| spellingShingle | Krittawat Thitachot Voramet Sirinopwong Viriya Seemuang Akkapon Ratchatasriprasert Roy N. Kirkwood Nutthee Am-in Influence of Backfat Thickness and the Interval from Altrenogest Withdrawal to Estrus on Reproductive Performance of Gilts Animals gilts altrenogest backfat depth fertility |
| title | Influence of Backfat Thickness and the Interval from Altrenogest Withdrawal to Estrus on Reproductive Performance of Gilts |
| title_full | Influence of Backfat Thickness and the Interval from Altrenogest Withdrawal to Estrus on Reproductive Performance of Gilts |
| title_fullStr | Influence of Backfat Thickness and the Interval from Altrenogest Withdrawal to Estrus on Reproductive Performance of Gilts |
| title_full_unstemmed | Influence of Backfat Thickness and the Interval from Altrenogest Withdrawal to Estrus on Reproductive Performance of Gilts |
| title_short | Influence of Backfat Thickness and the Interval from Altrenogest Withdrawal to Estrus on Reproductive Performance of Gilts |
| title_sort | influence of backfat thickness and the interval from altrenogest withdrawal to estrus on reproductive performance of gilts |
| topic | gilts altrenogest backfat depth fertility |
| url | https://www.mdpi.com/2076-2615/11/5/1348 |
| work_keys_str_mv | AT krittawatthitachot influenceofbackfatthicknessandtheintervalfromaltrenogestwithdrawaltoestrusonreproductiveperformanceofgilts AT vorametsirinopwong influenceofbackfatthicknessandtheintervalfromaltrenogestwithdrawaltoestrusonreproductiveperformanceofgilts AT viriyaseemuang influenceofbackfatthicknessandtheintervalfromaltrenogestwithdrawaltoestrusonreproductiveperformanceofgilts AT akkaponratchatasriprasert influenceofbackfatthicknessandtheintervalfromaltrenogestwithdrawaltoestrusonreproductiveperformanceofgilts AT roynkirkwood influenceofbackfatthicknessandtheintervalfromaltrenogestwithdrawaltoestrusonreproductiveperformanceofgilts AT nuttheeamin influenceofbackfatthicknessandtheintervalfromaltrenogestwithdrawaltoestrusonreproductiveperformanceofgilts |