Impacts of estrus expression and intensity during a timed-ai protocol on variables associated with fertility and pregnancy success in bos indicus-influenced beef cows1
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1093/jas/skx043 http://hdl.handle.net/11449/170675 |
Resumo: | This experiment evaluated the impacts of estrus expression and intensity, estimated by physical activity during a timed-AI protocol, on reproductive performance of Bos indicus-influenced beef cows. A total of 290 lactating, primiparous, and multiparous nonpregnant Nelore × Angus cows received a 2 mg injection of estradiol benzoate and an intravaginal progesterone (P4) releasing device (CIDR) on d −11, a 12.5 mg injection of PGF2α on d −4, CIDR removal in addition to 0.6 mg injection of estradiol cypionate and 300 IU injection of eCG on d −2, and timed-AI on d 0. Cows were fitted with a pedometer behind their left shoulder on d −4. An estrus detection patch was attached to the tail-head of each cow on d −2. Pedometer results were recorded on d −2 and 0. Estrus expression was defined as removal of >50% of the rub-off coating from the patch on d 0. Net physical activity during estrus was calculated by subtracting total steps from d −4 to −2 (nonestrus basal activity) from total steps from d −2 to 0 (proes-trus + estrus period) of each cow. Cows that did not express estrus were classified as NOESTR. Cows that expressed estrus were ranked by net physical activity; those above the median were classified as HIESTR and the remaining cows as LWESTR. Ovarian ultrasonography was performed on d 0 and 7. Blood was collected on d 0, 7, 20, and 30. Pregnancy status was verified by ultrasonography on d 30. Only data from cows responsive to the estrus synchronization protocol were utilized (NOESTR, n = 59; LWESTR, n = 100; HIESTR, n = 98). Diameter of dominant follicle on d 0, corpus luteum volume on d 7, and plasma P4 concentrations on d 7 were greater (P ≤ 0.05) in HIESTR vs. LWESTR and NOESTR and also greater (P ≤ 0.05) for LWESTR vs. NOESTR. Plasma P4 concentrations on d 0 were greater (P < 0.01) in NOESTR vs. HIESTR and LWESTR and similar (P = 0.93) between HIESTR and LWESTR. Whole blood mRNA expression of myxovirus resistance 2 on d 20 was greater (P ≤ 0.05) in HIESTR vs. LWESTR and NOESTR, and similar (P = 0.72) between LWESTR and NOESTR. Pregnancy rates were less (P ≤ 0.04) in NOESTR vs. HIESTR and LWESTR (52.4%, 68.9%, and 73.5%, SEM = 7.2), and similar (P = 0.57) between HIESTR and LWESTR. Hence, expression of estrus during a timed-AI protocol improved ovarian dynamics and pregnancy success, whereas estrus intensity modulated key biological markers associated with fertility but not pregnancy rates in B. indicus-influenced cows beef cows. |
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Impacts of estrus expression and intensity during a timed-ai protocol on variables associated with fertility and pregnancy success in bos indicus-influenced beef cows1Beef cowsEstrus expressionEstrus intensityPhysical activityPregnancyThis experiment evaluated the impacts of estrus expression and intensity, estimated by physical activity during a timed-AI protocol, on reproductive performance of Bos indicus-influenced beef cows. A total of 290 lactating, primiparous, and multiparous nonpregnant Nelore × Angus cows received a 2 mg injection of estradiol benzoate and an intravaginal progesterone (P4) releasing device (CIDR) on d −11, a 12.5 mg injection of PGF2α on d −4, CIDR removal in addition to 0.6 mg injection of estradiol cypionate and 300 IU injection of eCG on d −2, and timed-AI on d 0. Cows were fitted with a pedometer behind their left shoulder on d −4. An estrus detection patch was attached to the tail-head of each cow on d −2. Pedometer results were recorded on d −2 and 0. Estrus expression was defined as removal of >50% of the rub-off coating from the patch on d 0. Net physical activity during estrus was calculated by subtracting total steps from d −4 to −2 (nonestrus basal activity) from total steps from d −2 to 0 (proes-trus + estrus period) of each cow. Cows that did not express estrus were classified as NOESTR. Cows that expressed estrus were ranked by net physical activity; those above the median were classified as HIESTR and the remaining cows as LWESTR. Ovarian ultrasonography was performed on d 0 and 7. Blood was collected on d 0, 7, 20, and 30. Pregnancy status was verified by ultrasonography on d 30. Only data from cows responsive to the estrus synchronization protocol were utilized (NOESTR, n = 59; LWESTR, n = 100; HIESTR, n = 98). Diameter of dominant follicle on d 0, corpus luteum volume on d 7, and plasma P4 concentrations on d 7 were greater (P ≤ 0.05) in HIESTR vs. LWESTR and NOESTR and also greater (P ≤ 0.05) for LWESTR vs. NOESTR. Plasma P4 concentrations on d 0 were greater (P < 0.01) in NOESTR vs. HIESTR and LWESTR and similar (P = 0.93) between HIESTR and LWESTR. Whole blood mRNA expression of myxovirus resistance 2 on d 20 was greater (P ≤ 0.05) in HIESTR vs. LWESTR and NOESTR, and similar (P = 0.72) between LWESTR and NOESTR. Pregnancy rates were less (P ≤ 0.04) in NOESTR vs. HIESTR and LWESTR (52.4%, 68.9%, and 73.5%, SEM = 7.2), and similar (P = 0.57) between HIESTR and LWESTR. Hence, expression of estrus during a timed-AI protocol improved ovarian dynamics and pregnancy success, whereas estrus intensity modulated key biological markers associated with fertility but not pregnancy rates in B. indicus-influenced cows beef cows.School of Veterinary Medicine and Animal Science São Paulo State University (UNESP)Department of Animal Science Texas A&M UniversityUnisalesiano AuxiliumApplied Animal Biology Faculty of Land and Food Systems University of British ColumbiaSelect Sires IncZoetisDepartment of Animal Science University of TennesseeSchool of Veterinary Medicine and Animal Science São Paulo State University (UNESP)Universidade Estadual Paulista (Unesp)Texas A&M UniversityUnisalesiano AuxiliumUniversity of British ColumbiaSelect Sires IncZoetisUniversity of TennesseeRodrigues, A. D. [UNESP]Cooke, R. F.Cipriano, R. S.Silva, L. G.T. [UNESP]Cerri, R. L.A.Cruppe, L. H.Meneghetti, M.Pohler, K. G.Vasconcelos, J. L.M. [UNESP]2018-12-11T16:51:57Z2018-12-11T16:51:57Z2018-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article236-249application/pdfhttp://dx.doi.org/10.1093/jas/skx043Journal of Animal Science, v. 96, n. 1, p. 236-249, 2018.1525-31630021-8812http://hdl.handle.net/11449/17067510.1093/jas/skx0432-s2.0-850421413532-s2.0-85042141353.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Animal Science0,848info:eu-repo/semantics/openAccess2024-01-03T06:26:25Zoai:repositorio.unesp.br:11449/170675Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T22:03:14.912048Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Impacts of estrus expression and intensity during a timed-ai protocol on variables associated with fertility and pregnancy success in bos indicus-influenced beef cows1 |
title |
Impacts of estrus expression and intensity during a timed-ai protocol on variables associated with fertility and pregnancy success in bos indicus-influenced beef cows1 |
spellingShingle |
Impacts of estrus expression and intensity during a timed-ai protocol on variables associated with fertility and pregnancy success in bos indicus-influenced beef cows1 Rodrigues, A. D. [UNESP] Beef cows Estrus expression Estrus intensity Physical activity Pregnancy |
title_short |
Impacts of estrus expression and intensity during a timed-ai protocol on variables associated with fertility and pregnancy success in bos indicus-influenced beef cows1 |
title_full |
Impacts of estrus expression and intensity during a timed-ai protocol on variables associated with fertility and pregnancy success in bos indicus-influenced beef cows1 |
title_fullStr |
Impacts of estrus expression and intensity during a timed-ai protocol on variables associated with fertility and pregnancy success in bos indicus-influenced beef cows1 |
title_full_unstemmed |
Impacts of estrus expression and intensity during a timed-ai protocol on variables associated with fertility and pregnancy success in bos indicus-influenced beef cows1 |
title_sort |
Impacts of estrus expression and intensity during a timed-ai protocol on variables associated with fertility and pregnancy success in bos indicus-influenced beef cows1 |
author |
Rodrigues, A. D. [UNESP] |
author_facet |
Rodrigues, A. D. [UNESP] Cooke, R. F. Cipriano, R. S. Silva, L. G.T. [UNESP] Cerri, R. L.A. Cruppe, L. H. Meneghetti, M. Pohler, K. G. Vasconcelos, J. L.M. [UNESP] |
author_role |
author |
author2 |
Cooke, R. F. Cipriano, R. S. Silva, L. G.T. [UNESP] Cerri, R. L.A. Cruppe, L. H. Meneghetti, M. Pohler, K. G. Vasconcelos, J. L.M. [UNESP] |
author2_role |
author author author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Texas A&M University Unisalesiano Auxilium University of British Columbia Select Sires Inc Zoetis University of Tennessee |
dc.contributor.author.fl_str_mv |
Rodrigues, A. D. [UNESP] Cooke, R. F. Cipriano, R. S. Silva, L. G.T. [UNESP] Cerri, R. L.A. Cruppe, L. H. Meneghetti, M. Pohler, K. G. Vasconcelos, J. L.M. [UNESP] |
dc.subject.por.fl_str_mv |
Beef cows Estrus expression Estrus intensity Physical activity Pregnancy |
topic |
Beef cows Estrus expression Estrus intensity Physical activity Pregnancy |
description |
This experiment evaluated the impacts of estrus expression and intensity, estimated by physical activity during a timed-AI protocol, on reproductive performance of Bos indicus-influenced beef cows. A total of 290 lactating, primiparous, and multiparous nonpregnant Nelore × Angus cows received a 2 mg injection of estradiol benzoate and an intravaginal progesterone (P4) releasing device (CIDR) on d −11, a 12.5 mg injection of PGF2α on d −4, CIDR removal in addition to 0.6 mg injection of estradiol cypionate and 300 IU injection of eCG on d −2, and timed-AI on d 0. Cows were fitted with a pedometer behind their left shoulder on d −4. An estrus detection patch was attached to the tail-head of each cow on d −2. Pedometer results were recorded on d −2 and 0. Estrus expression was defined as removal of >50% of the rub-off coating from the patch on d 0. Net physical activity during estrus was calculated by subtracting total steps from d −4 to −2 (nonestrus basal activity) from total steps from d −2 to 0 (proes-trus + estrus period) of each cow. Cows that did not express estrus were classified as NOESTR. Cows that expressed estrus were ranked by net physical activity; those above the median were classified as HIESTR and the remaining cows as LWESTR. Ovarian ultrasonography was performed on d 0 and 7. Blood was collected on d 0, 7, 20, and 30. Pregnancy status was verified by ultrasonography on d 30. Only data from cows responsive to the estrus synchronization protocol were utilized (NOESTR, n = 59; LWESTR, n = 100; HIESTR, n = 98). Diameter of dominant follicle on d 0, corpus luteum volume on d 7, and plasma P4 concentrations on d 7 were greater (P ≤ 0.05) in HIESTR vs. LWESTR and NOESTR and also greater (P ≤ 0.05) for LWESTR vs. NOESTR. Plasma P4 concentrations on d 0 were greater (P < 0.01) in NOESTR vs. HIESTR and LWESTR and similar (P = 0.93) between HIESTR and LWESTR. Whole blood mRNA expression of myxovirus resistance 2 on d 20 was greater (P ≤ 0.05) in HIESTR vs. LWESTR and NOESTR, and similar (P = 0.72) between LWESTR and NOESTR. Pregnancy rates were less (P ≤ 0.04) in NOESTR vs. HIESTR and LWESTR (52.4%, 68.9%, and 73.5%, SEM = 7.2), and similar (P = 0.57) between HIESTR and LWESTR. Hence, expression of estrus during a timed-AI protocol improved ovarian dynamics and pregnancy success, whereas estrus intensity modulated key biological markers associated with fertility but not pregnancy rates in B. indicus-influenced cows beef cows. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-12-11T16:51:57Z 2018-12-11T16:51:57Z 2018-01-01 |
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/10.1093/jas/skx043 Journal of Animal Science, v. 96, n. 1, p. 236-249, 2018. 1525-3163 0021-8812 http://hdl.handle.net/11449/170675 10.1093/jas/skx043 2-s2.0-85042141353 2-s2.0-85042141353.pdf |
url |
http://dx.doi.org/10.1093/jas/skx043 http://hdl.handle.net/11449/170675 |
identifier_str_mv |
Journal of Animal Science, v. 96, n. 1, p. 236-249, 2018. 1525-3163 0021-8812 10.1093/jas/skx043 2-s2.0-85042141353 2-s2.0-85042141353.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Animal Science 0,848 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
236-249 application/pdf |
dc.source.none.fl_str_mv |
Scopus 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 |
|
_version_ |
1808129387248222208 |