Effect of climate and insemination technique on reproductive performance of gilts and sows in a subtropical zone of Mexico

ABSTRACT: 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 tech...

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Autores principales:	Mellado,Miguel, Gaytán,Leticia, Macías-Cruz,Ulises, Avendaño,Leonel, Meza-Herrera,Cesar, Lozano,Eloy A., Rodríguez,Álvaro, Mellado,Jesús
Lenguaje:	English
Publicado:	Universidad Austral de Chile. Facultad de Ciencias Veterinarias 2018
Materias:	sows seasonal infertility litter size stillborn piglets temperature-humidity index
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0719-81322018000100106
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spelling	oai:scielo:S0719-813220180001001062018-01-08Effect of climate and insemination technique on reproductive performance of gilts and sows in a subtropical zone of MexicoMellado,MiguelGaytán,LeticiaMacías-Cruz,UlisesAvendaño,LeonelMeza-Herrera,CesarLozano,Eloy A.Rodríguez,ÁlvaroMellado,Jesús sows seasonal infertility litter size stillborn piglets temperature-humidity index ABSTRACT: 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.info:eu-repo/semantics/openAccessUniversidad Austral de Chile. Facultad de Ciencias VeterinariasAustral journal of veterinary sciences v.50 n.1 20182018-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0719-81322018000100106en10.4067/S0719-81322018000100106
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	sows seasonal infertility litter size stillborn piglets temperature-humidity index
spellingShingle	sows seasonal infertility litter size stillborn piglets temperature-humidity index Mellado,Miguel Gaytán,Leticia Macías-Cruz,Ulises Avendaño,Leonel Meza-Herrera,Cesar Lozano,Eloy A. Rodríguez,Álvaro Mellado,Jesús Effect of climate and insemination technique on reproductive performance of gilts and sows in a subtropical zone of Mexico
description	ABSTRACT: 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.
author	Mellado,Miguel Gaytán,Leticia Macías-Cruz,Ulises Avendaño,Leonel Meza-Herrera,Cesar Lozano,Eloy A. Rodríguez,Álvaro Mellado,Jesús
author_facet	Mellado,Miguel Gaytán,Leticia Macías-Cruz,Ulises Avendaño,Leonel Meza-Herrera,Cesar Lozano,Eloy A. Rodríguez,Álvaro Mellado,Jesús
author_sort	Mellado,Miguel
title	Effect of climate and insemination technique on reproductive performance of gilts and sows in a subtropical zone of Mexico
title_short	Effect of climate and insemination technique on reproductive performance of gilts and sows in a subtropical zone of Mexico
title_full	Effect of climate and insemination technique on reproductive performance of gilts and sows in a subtropical zone of Mexico
title_fullStr	Effect of climate and insemination technique on reproductive performance of gilts and sows in a subtropical zone of Mexico
title_full_unstemmed	Effect of climate and insemination technique on reproductive performance of gilts and sows in a subtropical zone of Mexico
title_sort	effect of climate and insemination technique on reproductive performance of gilts and sows in a subtropical zone of mexico
publisher	Universidad Austral de Chile. Facultad de Ciencias Veterinarias
publishDate	2018
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0719-81322018000100106
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Effect of climate and insemination technique on reproductive performance of gilts and sows in a subtropical zone of Mexico

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