Effect of climate and insemination technique on reproductive performance of gilts and sows in a subtropical zone of Mexico
Effect of climate and insemination technique on reproductive performance of gilts and sows in a subtropical zone of Mexico
| dc.creator | Mellado, Miguel | |
| dc.creator | Gaytán, Leticia | |
| dc.creator | Macías-Cruz, Ulises | |
| dc.creator | Avendaño, Leonel | |
| dc.creator | Meza-Herrera, Cesar | |
| dc.creator | Lozano, Eloy A. | |
| dc.creator | Rodríguez, Álvaro | |
| dc.creator | Mellado, Jesús | |
| dc.date | 2018-01-09 | |
| dc.date.accessioned | 2020-07-14T19:03:40Z | |
| dc.date.available | 2020-07-14T19:03:40Z | |
| dc.identifier | http://revistas.uach.cl/index.php/australjvs/article/view/1213 | |
| dc.identifier | 10.4067/S0719-81322018000100106 | |
| dc.identifier.uri | https://revistaschilenas.uchile.cl/handle/2250/143703 | |
| dc.description | The objective of this study was to analyse the reproductive performance of hybrid (Yorkshire x Landrace) gilts/sows in relation to temperature-humidity index (THI) at artificial insemination (AI), season of AI, occurrence of estrus >8 d post-weaning, repeated estrus, insemination technique (cervical, CAI or post-cervical, PCAI) and parity. Data included 8851 reproductive records (1771 for gilts and 7080 for sows) from a pig farm in a sub-tropical zone (THI ranged from 72.9 in January to 81.8 in June). A decrease in pregnancy rate (PR, 89.8 vs 93.0%; P<0.01) and a tendency to decline farrowing rate (FR, 87.9 vs 90.3%; P=0.07) following AI during high THI (>82), compared to AI at <74 THI were observed. The spring and summer season were associated with decreased (P<0.01) PR compared with fall and winter (90.0% vs 93.0%). Likewise, FR decreased in spring and summer compared to fall and winter (88.5% vs. 90.9%). FR was higher (P<0.01) in non-repeat breeders compared with that of repeat-breeders (90.3% vs 76.2%). Litter size increased (P<0.01) from 10.8 ± 3.2 to 11.1 ± 3.1 pigs when the interval from weaning to estrus was >8 d. The insemination technique did not affect PR and FR but the litter size decreased (P<0.05) from 11.3 ± 3.0 to 11.1 ± 2.9 pigs when PCAI was used compared to CAI. This study reaffirms the negative effects of the hot season on reproductive performance of gilts/sows, although thermal stress at AI did not cause foetal losses. Also, there is no advantage in using the PCAI as compared to the CAI in gilts/sows with high numbers of sperm cells per AI. | en-US |
| dc.description | The objective of this study was to analyse the reproductive performance of hybrid (Yorkshire x Landrace) gilts/sows in relation to temperature-humidity index (THI) at artificial insemination (AI), season of AI, occurrence of estrus >8 d post-weaning, repeated estrus, insemination technique (cervical, CAI or post-cervical, PCAI) and parity. Data included 8851 reproductive records (1771 for gilts and 7080 for sows) from a pig farm in a sub-tropical zone (THI ranged from 72.9 in January to 81.8 in June). A decrease in pregnancy rate (PR, 89.8 vs 93.0%; P<0.01) and a tendency to decline farrowing rate (FR, 87.9 vs 90.3%; P=0.07) following AI during high THI (>82), compared to AI at <74 THI were observed. The spring and summer season were associated with decreased (P<0.01) PR compared with fall and winter (90.0% vs 93.0%). Likewise, FR decreased in spring and summer compared to fall and winter (88.5% vs. 90.9%). FR was higher (P<0.01) in non-repeat breeders compared with that of repeat-breeders (90.3% vs 76.2%). Litter size increased (P<0.01) from 10.8 ± 3.2 to 11.1 ± 3.1 pigs when the interval from weaning to estrus was >8 d. The insemination technique did not affect PR and FR but the litter size decreased (P<0.05) from 11.3 ± 3.0 to 11.1 ± 2.9 pigs when PCAI was used compared to CAI. This study reaffirms the negative effects of the hot season on reproductive performance of gilts/sows, although thermal stress at AI did not cause foetal losses. Also, there is no advantage in using the PCAI as compared to the CAI in gilts/sows with high numbers of sperm cells per AI. | es-ES |
| dc.format | application/pdf | |
| dc.language | spa | |
| dc.publisher | Facultad de Ciencias Veterinarias - Universidad Austral de Chile | es-ES |
| dc.relation | http://revistas.uach.cl/index.php/australjvs/article/view/1213/1232 | |
| dc.rights | Derechos de autor 2018 Austral Journal of Veterinary Sciences | es-ES |
| dc.source | Austral Journal of Veterinary Sciences; Vol. 50 Núm. 1 (2018); 27-34 | en-US |
| dc.source | Austral Journal of Veterinary Sciences; Vol. 50 Núm. 1 (2018); 27-34 | es-ES |
| dc.source | 0719-8132 | |
| dc.source | 0719-8000 | |
| dc.title | Effect of climate and insemination technique on reproductive performance of gilts and sows in a subtropical zone of Mexico | en-US |
| dc.title | Effect of climate and insemination technique on reproductive performance of gilts and sows in a subtropical zone of Mexico | es-ES |
| dc.type | info:eu-repo/semantics/article | |
| dc.type | info:eu-repo/semantics/publishedVersion |