Evaluation of a modified GnRH-based timed-AI protocol associated with estrus detection in beef heifers inseminated with sex-selected or conventional semen

The main objective was to compare pregnancy per Al (P/AI) between sex-selected and conventional semen in cyclic beef heifers subjected to a 5-day Co-synch plus CIDR protocol and evaluated the usefulness of an estrus detection (ED) aid to identify heifers that were most likely to conceive. This study...

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Autores: Colazo, M. G., Whittaker, P., Macmillan, K., Bignell, D., Boender, G., Carvalho Guimaraes, R. de [UNESP], Mapletoft, R. J.
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2018
País:Brasil
Recursos:Universidade Estadual Paulista (UNESP)
Repositorio:Repositório Institucional da UNESP
Idioma:inglés
OAI Identifier:oai:repositorio.unesp.br:11449/160557
Acesso em linha:http://dx.doi.org/10.1016/j.theriogenology.2018.05.037
http://hdl.handle.net/11449/160557
Access Level:acceso abierto
Palavra-chave:Estrus response
Pregnancy per AI
Cyclicity status
Estrus detection patches
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oai_identifier_str oai:repositorio.unesp.br:11449/160557
network_acronym_str BR
network_name_str Brasil
repository_id_str
dc.title.none.fl_str_mv Evaluation of a modified GnRH-based timed-AI protocol associated with estrus detection in beef heifers inseminated with sex-selected or conventional semen
title Evaluation of a modified GnRH-based timed-AI protocol associated with estrus detection in beef heifers inseminated with sex-selected or conventional semen
spellingShingle Evaluation of a modified GnRH-based timed-AI protocol associated with estrus detection in beef heifers inseminated with sex-selected or conventional semen
Colazo, M. G.
Estrus response
Pregnancy per AI
Cyclicity status
Estrus detection patches
title_short Evaluation of a modified GnRH-based timed-AI protocol associated with estrus detection in beef heifers inseminated with sex-selected or conventional semen
title_full Evaluation of a modified GnRH-based timed-AI protocol associated with estrus detection in beef heifers inseminated with sex-selected or conventional semen
title_fullStr Evaluation of a modified GnRH-based timed-AI protocol associated with estrus detection in beef heifers inseminated with sex-selected or conventional semen
title_full_unstemmed Evaluation of a modified GnRH-based timed-AI protocol associated with estrus detection in beef heifers inseminated with sex-selected or conventional semen
title_sort Evaluation of a modified GnRH-based timed-AI protocol associated with estrus detection in beef heifers inseminated with sex-selected or conventional semen
dc.creator.none.fl_str_mv Colazo, M. G.
Whittaker, P.
Macmillan, K.
Bignell, D.
Boender, G.
Carvalho Guimaraes, R. de [UNESP]
Mapletoft, R. J.
author Colazo, M. G.
author_facet Colazo, M. G.
Whittaker, P.
Macmillan, K.
Bignell, D.
Boender, G.
Carvalho Guimaraes, R. de [UNESP]
Mapletoft, R. J.
author_role author
author2 Whittaker, P.
Macmillan, K.
Bignell, D.
Boender, G.
Carvalho Guimaraes, R. de [UNESP]
Mapletoft, R. J.
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Alberta Agr & Forestry
Farm Anim Hosp
Universidade Estadual Paulista (Unesp)
Univ Saskatchewan
dc.subject.por.fl_str_mv Estrus response
Pregnancy per AI
Cyclicity status
Estrus detection patches
topic Estrus response
Pregnancy per AI
Cyclicity status
Estrus detection patches
description The main objective was to compare pregnancy per Al (P/AI) between sex-selected and conventional semen in cyclic beef heifers subjected to a 5-day Co-synch plus CIDR protocol and evaluated the usefulness of an estrus detection (ED) aid to identify heifers that were most likely to conceive. This study also determined if the expression of estrus before timed-AI (TAI) would be associated with increased P/AI in acyclic heifers inseminated with conventional semen. Heifers (n = 1690; 320-523 kg of body weight, and 13-15 mo of age) at three locations over 2 years were scanned by ultrasonography to determine cyclicity (presence of luteal tissue) and reproductive tract normalcy. Cyclic heifers (n = 1331) received a progesterone releasing device (CIDR) on Day 0, CIDR removal and 500 jig of cloprostenol (PGF) on Day 5, and 100 jig of GnRH along with TAI on Day 8. Acyclic heifers (n = 275) received the same treatment with the addition of GnRH on Day 0. On Day 5, all heifers received ED patches (Estrotect (TM)) that were scored from 0 to 3, based on color change between initial application and Day 8; 0 = unchanged, I = <= 50% color change, 2 = > 50% color change, 3 = missing. Estrus was defined to have occurred when an ED patch was scored 2 or 3. Cyclic heifers were inseminated with either frozen-thawed sex-selected or conventional semen from either of three sires available commercially (two per year). Acyclic heifers were inseminated with conventional semen. Pregnancy diagnosis was performed by transrectal ultrasonography 28 or 48 d after TAI, depending on management. The percentage of cyclic heifers was 83.9% and the average estrus response was 63.8%. P/AI was greater (P < 0.01) in cyclic compared to acyclic heifers (53.3 vs. 36.0%) and tended to be greater (P = 0.07) for conventional semen (52.3 vs. 47.6%), despite all acyclic heifers being inseminated with conventional semen. Heifers with an ED patch scored 2 (61.1%) or 3 (58.6%) had greater (P < 0.01) P/AI than those scored 0 (31.8%) or 1 (33.1%), regardless of semen type. Pregnancy per AI was greater (P < 0.01) for heifers detected in estrus (60.6 vs. 32.3%). In cyclic heifers that did not exhibit estrus, P/AI was lower (P < 0.01) in those inseminated with sex-selected semen (27.8 vs. 45.9%), while in heifers that exhibited estrus, P/AI only tended to be lower (P = 0.08; 56.7 vs. 65.5%). In summary, P/AI was greater in cyclic heifers, in those inseminated with conventional semen and in those exhibiting estrus before TAI. The ED patches were considered useful to identify animals for TAI with sex-selected semen and could be used to increase the adoption of this technology in beef herds. (C) 2018 Published by Elsevier Inc.
publishDate 2018
dc.date.none.fl_str_mv 2018-11-26T16:04:58Z
2018-11-26T16:04:58Z
2018-09-15
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1016/j.theriogenology.2018.05.037
Theriogenology. New York: Elsevier Science Inc, v. 118, p. 90-95, 2018.
0093-691X
http://hdl.handle.net/11449/160557
10.1016/j.theriogenology.2018.05.037
WOS:000443531600013
WOS000443531600013.pdf
url http://dx.doi.org/10.1016/j.theriogenology.2018.05.037
http://hdl.handle.net/11449/160557
identifier_str_mv Theriogenology. New York: Elsevier Science Inc, v. 118, p. 90-95, 2018.
0093-691X
10.1016/j.theriogenology.2018.05.037
WOS:000443531600013
WOS000443531600013.pdf
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Theriogenology
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 90-95
application/pdf
dc.publisher.none.fl_str_mv Elsevier B.V.
publisher.none.fl_str_mv Elsevier B.V.
dc.source.none.fl_str_mv Web of Science
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv repositoriounesp@unesp.br
_version_ 1853672014745698304
spelling Evaluation of a modified GnRH-based timed-AI protocol associated with estrus detection in beef heifers inseminated with sex-selected or conventional semenEstrus responsePregnancy per AICyclicity statusEstrus detection patchesThe main objective was to compare pregnancy per Al (P/AI) between sex-selected and conventional semen in cyclic beef heifers subjected to a 5-day Co-synch plus CIDR protocol and evaluated the usefulness of an estrus detection (ED) aid to identify heifers that were most likely to conceive. This study also determined if the expression of estrus before timed-AI (TAI) would be associated with increased P/AI in acyclic heifers inseminated with conventional semen. Heifers (n = 1690; 320-523 kg of body weight, and 13-15 mo of age) at three locations over 2 years were scanned by ultrasonography to determine cyclicity (presence of luteal tissue) and reproductive tract normalcy. Cyclic heifers (n = 1331) received a progesterone releasing device (CIDR) on Day 0, CIDR removal and 500 jig of cloprostenol (PGF) on Day 5, and 100 jig of GnRH along with TAI on Day 8. Acyclic heifers (n = 275) received the same treatment with the addition of GnRH on Day 0. On Day 5, all heifers received ED patches (Estrotect (TM)) that were scored from 0 to 3, based on color change between initial application and Day 8; 0 = unchanged, I = <= 50% color change, 2 = > 50% color change, 3 = missing. Estrus was defined to have occurred when an ED patch was scored 2 or 3. Cyclic heifers were inseminated with either frozen-thawed sex-selected or conventional semen from either of three sires available commercially (two per year). Acyclic heifers were inseminated with conventional semen. Pregnancy diagnosis was performed by transrectal ultrasonography 28 or 48 d after TAI, depending on management. The percentage of cyclic heifers was 83.9% and the average estrus response was 63.8%. P/AI was greater (P < 0.01) in cyclic compared to acyclic heifers (53.3 vs. 36.0%) and tended to be greater (P = 0.07) for conventional semen (52.3 vs. 47.6%), despite all acyclic heifers being inseminated with conventional semen. Heifers with an ED patch scored 2 (61.1%) or 3 (58.6%) had greater (P < 0.01) P/AI than those scored 0 (31.8%) or 1 (33.1%), regardless of semen type. Pregnancy per AI was greater (P < 0.01) for heifers detected in estrus (60.6 vs. 32.3%). In cyclic heifers that did not exhibit estrus, P/AI was lower (P < 0.01) in those inseminated with sex-selected semen (27.8 vs. 45.9%), while in heifers that exhibited estrus, P/AI only tended to be lower (P = 0.08; 56.7 vs. 65.5%). In summary, P/AI was greater in cyclic heifers, in those inseminated with conventional semen and in those exhibiting estrus before TAI. The ED patches were considered useful to identify animals for TAI with sex-selected semen and could be used to increase the adoption of this technology in beef herds. (C) 2018 Published by Elsevier Inc.Livestock Research Section, Alberta Agriculture and ForestryAlberta Agr & Forestry, Livestock Res Sect, Edmonton, AB T6H 5T6, CanadaFarm Anim Hosp, Leduc, AB T9E 6Z9, CanadaSao Paulo State Univ, BR-16050680 Aracatuba, BrazilUniv Saskatchewan, Western Coll Vet Med, Saskatoon, SK S7N 5B4, CanadaSao Paulo State Univ, BR-16050680 Aracatuba, BrazilElsevier B.V.Alberta Agr & ForestryFarm Anim HospUniversidade Estadual Paulista (Unesp)Univ Saskatchewan2018-11-26T16:04:58Z2018-11-26T16:04:58Z2018-09-15info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article90-95application/pdfhttp://dx.doi.org/10.1016/j.theriogenology.2018.05.037Theriogenology. New York: Elsevier Science Inc, v. 118, p. 90-95, 2018.0093-691Xhttp://hdl.handle.net/11449/16055710.1016/j.theriogenology.2018.05.037WOS:000443531600013WOS000443531600013.pdfWeb of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengTheriogenologyinfo:eu-repo/semantics/openAccessColazo, M. G.Whittaker, P.Macmillan, K.Bignell, D.Boender, G.Carvalho Guimaraes, R. de [UNESP]Mapletoft, R. J.2023-12-04T06:15:14Zoai:repositorio.unesp.br:11449/160557Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestrepositoriounesp@unesp.bropendoar:29462023-12-04T06:15:14Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
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