Effects of an eCG-like glycoprotein treatment and nutritional status on reproductive performance in suckled beef cows subjected to a progesterone-based 7-d Co-Synch protocol

Autores
Rodriguez, Alejandro Martin; Maresca, Sebastian; Lopez Valiente, Sebastian; Pérez Wallace, Santiago; Bilbao, María Guillermina; Long, Nathan M.; Meikle, Ana; Bartolome, Julián Alberto
Año de publicación
2025
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The objective of the present study was to evaluate the effects of a synthetic eCG-like glycoprotein treatment, body condition score changes, and postpartum nutritional supplementation on follicular and luteal characteristics and pregnancy rates in suckled beef cows synchronized with a 7-d Co-Synch protocol. In Experiment I, 1218 suckled cows received a progesterone intravaginal device (1.0 g; IVD) and 100 μg GnRH on Day −10. On Day −3, IVDs were removed, and cows received 0.5 mg sodium cloprostenol and were randomly assigned to receive either 400 IU eCG-like glycoprotein (eCG-like; n = 602) or no eCG-like glycoprotein (Control; n = 616). On Day 0, 100 μg GnRH was given concurrently with TAI. Body condition score (BCS) was recorded on Day −10 and 35, and its change was calculated. Corpus luteum (CL) presence was evaluated on Day −10, and pregnancy (P/TAI) on Day 35. In cows without CL, eCG-like increased estrus expression rate (EER; 58.2 vs. 45.3 %; P = 0.01). In cows that lost BCS, eCG-like increased P/TAI (47.2 vs. 32.1 %; P = 0.01). In Experiment II, 72 cows, 21 d postpartum, were assigned to supplemented (SUP; 4 kg of corn daily) or non-supplemented (NSUP) diets for 80 days. Cows were subjected to the same synchronization protocol and eCG-like glycoprotein treatment described in Exp. I. Nutritional SUP increased (P ≤ 0.05) body weight and BCS. Dominant follicle (DF) growth tended to be greater in eCG-like group than Control (1.2 vs. 0.7 ± 0.3 mm/d; P = 0.08), while the SUP group exhibited greater ovulation rate and CL area compared with NSUP (P ≤ 0.03). The eCG-like treatment increased EER in cows without CL and P/TAI in those losing BCS. Although eCG-like tended to improve DF growth, no interaction was observed between nutritional and eCG-like treatment on follicular and luteal characteristics.
EEA Cuenca del Salado
Fil: Rodriguez, Alejandro Martin. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Cuenca del Salado; Argentina
Fil: Maresca, Sebastian. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Cuenca del Salado; Argentina
Fil: Lopez Valiente, Sebastian. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Cuenca del Salado; Argentina
Fil: Pérez Wallace, Santiago. Syntex S.A.; Argentina
Fil: Bilbao, Guillermina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Bilbao, Guillermina. Universidad Nacional de La Pampa. Facultad de Ciencias Veterinarias; Argentina
Fil: Long, Nathan M. Clemson University. Department of Animal and Veterinary Sciences; Estados Unidos
Fil: Meikle, Ana. Universidad de La República. Facultad de Veterinaria. Laboratorio de Endocrinología y Metabolismo Animal; Uruguay
Fil: Bartolome, Julian. Universidad Nacional de La Pampa. Facultad de Ciencias Veterinarias; Argentina
Fuente
Theriogenology 242 : 117443. (August 2025)
Materia
Ganado de Carne
Reproducción Animal
Lactancia
Progesterona
Gestación
Sincronización
Glicoproteínas
Beef Cattle
Animal Reproduction
Suckling
Progesterone
Pregnancy
Synchronization
Glycoproteins
Nivel de accesibilidad
acceso restringido
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
INTA Digital (INTA)
Institución
Instituto Nacional de Tecnología Agropecuaria
OAI Identificador
oai:localhost:20.500.12123/27044
Acceder
id INTADig_f371e1f00fb5c212996a244511094854
oai_identifier_str oai:localhost:20.500.12123/27044
network_acronym_str INTADig
repository_id_str l
network_name_str INTA Digital (INTA)
spelling Effects of an eCG-like glycoprotein treatment and nutritional status on reproductive performance in suckled beef cows subjected to a progesterone-based 7-d Co-Synch protocolRodriguez, Alejandro MartinMaresca, SebastianLopez Valiente, SebastianPérez Wallace, SantiagoBilbao, María GuillerminaLong, Nathan M.Meikle, AnaBartolome, Julián AlbertoGanado de CarneReproducción AnimalLactanciaProgesteronaGestaciónSincronizaciónGlicoproteínasBeef CattleAnimal ReproductionSucklingProgesteronePregnancySynchronizationGlycoproteinsThe objective of the present study was to evaluate the effects of a synthetic eCG-like glycoprotein treatment, body condition score changes, and postpartum nutritional supplementation on follicular and luteal characteristics and pregnancy rates in suckled beef cows synchronized with a 7-d Co-Synch protocol. In Experiment I, 1218 suckled cows received a progesterone intravaginal device (1.0 g; IVD) and 100 μg GnRH on Day −10. On Day −3, IVDs were removed, and cows received 0.5 mg sodium cloprostenol and were randomly assigned to receive either 400 IU eCG-like glycoprotein (eCG-like; n = 602) or no eCG-like glycoprotein (Control; n = 616). On Day 0, 100 μg GnRH was given concurrently with TAI. Body condition score (BCS) was recorded on Day −10 and 35, and its change was calculated. Corpus luteum (CL) presence was evaluated on Day −10, and pregnancy (P/TAI) on Day 35. In cows without CL, eCG-like increased estrus expression rate (EER; 58.2 vs. 45.3 %; P = 0.01). In cows that lost BCS, eCG-like increased P/TAI (47.2 vs. 32.1 %; P = 0.01). In Experiment II, 72 cows, 21 d postpartum, were assigned to supplemented (SUP; 4 kg of corn daily) or non-supplemented (NSUP) diets for 80 days. Cows were subjected to the same synchronization protocol and eCG-like glycoprotein treatment described in Exp. I. Nutritional SUP increased (P ≤ 0.05) body weight and BCS. Dominant follicle (DF) growth tended to be greater in eCG-like group than Control (1.2 vs. 0.7 ± 0.3 mm/d; P = 0.08), while the SUP group exhibited greater ovulation rate and CL area compared with NSUP (P ≤ 0.03). The eCG-like treatment increased EER in cows without CL and P/TAI in those losing BCS. Although eCG-like tended to improve DF growth, no interaction was observed between nutritional and eCG-like treatment on follicular and luteal characteristics.EEA Cuenca del SaladoFil: Rodriguez, Alejandro Martin. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Cuenca del Salado; ArgentinaFil: Maresca, Sebastian. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Cuenca del Salado; ArgentinaFil: Lopez Valiente, Sebastian. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Cuenca del Salado; ArgentinaFil: Pérez Wallace, Santiago. Syntex S.A.; ArgentinaFil: Bilbao, Guillermina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Bilbao, Guillermina. Universidad Nacional de La Pampa. Facultad de Ciencias Veterinarias; ArgentinaFil: Long, Nathan M. Clemson University. Department of Animal and Veterinary Sciences; Estados UnidosFil: Meikle, Ana. Universidad de La República. Facultad de Veterinaria. Laboratorio de Endocrinología y Metabolismo Animal; UruguayFil: Bartolome, Julian. Universidad Nacional de La Pampa. Facultad de Ciencias Veterinarias; ArgentinaElsevier2026-07-17T11:54:50Z2026-07-17T11:54:50Z2025-08info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://hdl.handle.net/20.500.12123/27044https://www.sciencedirect.com/science/article/abs/pii/S0093691X250016940093-691X1879-3231https://doi.org/10.1016/j.theriogenology.2025.117443Theriogenology 242 : 117443. (August 2025)reponame:INTA Digital (INTA)instname:Instituto Nacional de Tecnología Agropecuariaenginfo:eu-repograntAgreement/INTA/2023-PD-L01-I112, Biotecnologías reproductivas y plataforma de edición génica para animales de interés zootécnico.info:eu-repo/semantics/restrictedAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)2026-10-01T10:25:34Zoai:localhost:20.500.12123/27044instacron:INTAInstitucionalhttp://repositorio.inta.gob.ar/Organismo científico-tecnológicoNo correspondehttp://repositorio.inta.gob.ar/oai/requesttripaldi.nicolas@inta.gob.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:l2026-10-01 10:25:35.712INTA Digital (INTA) - Instituto Nacional de Tecnología Agropecuariafalse
dc.title.none.fl_str_mv Effects of an eCG-like glycoprotein treatment and nutritional status on reproductive performance in suckled beef cows subjected to a progesterone-based 7-d Co-Synch protocol
title Effects of an eCG-like glycoprotein treatment and nutritional status on reproductive performance in suckled beef cows subjected to a progesterone-based 7-d Co-Synch protocol
spellingShingle Effects of an eCG-like glycoprotein treatment and nutritional status on reproductive performance in suckled beef cows subjected to a progesterone-based 7-d Co-Synch protocol
Rodriguez, Alejandro Martin
Ganado de Carne
Reproducción Animal
Lactancia
Progesterona
Gestación
Sincronización
Glicoproteínas
Beef Cattle
Animal Reproduction
Suckling
Progesterone
Pregnancy
Synchronization
Glycoproteins
title_short Effects of an eCG-like glycoprotein treatment and nutritional status on reproductive performance in suckled beef cows subjected to a progesterone-based 7-d Co-Synch protocol
title_full Effects of an eCG-like glycoprotein treatment and nutritional status on reproductive performance in suckled beef cows subjected to a progesterone-based 7-d Co-Synch protocol
title_fullStr Effects of an eCG-like glycoprotein treatment and nutritional status on reproductive performance in suckled beef cows subjected to a progesterone-based 7-d Co-Synch protocol
title_full_unstemmed Effects of an eCG-like glycoprotein treatment and nutritional status on reproductive performance in suckled beef cows subjected to a progesterone-based 7-d Co-Synch protocol
title_sort Effects of an eCG-like glycoprotein treatment and nutritional status on reproductive performance in suckled beef cows subjected to a progesterone-based 7-d Co-Synch protocol
dc.creator.none.fl_str_mv Rodriguez, Alejandro Martin
Maresca, Sebastian
Lopez Valiente, Sebastian
Pérez Wallace, Santiago
Bilbao, María Guillermina
Long, Nathan M.
Meikle, Ana
Bartolome, Julián Alberto
author Rodriguez, Alejandro Martin
author_facet Rodriguez, Alejandro Martin
Maresca, Sebastian
Lopez Valiente, Sebastian
Pérez Wallace, Santiago
Bilbao, María Guillermina
Long, Nathan M.
Meikle, Ana
Bartolome, Julián Alberto
author_role author
author2 Maresca, Sebastian
Lopez Valiente, Sebastian
Pérez Wallace, Santiago
Bilbao, María Guillermina
Long, Nathan M.
Meikle, Ana
Bartolome, Julián Alberto
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Ganado de Carne
Reproducción Animal
Lactancia
Progesterona
Gestación
Sincronización
Glicoproteínas
Beef Cattle
Animal Reproduction
Suckling
Progesterone
Pregnancy
Synchronization
Glycoproteins
topic Ganado de Carne
Reproducción Animal
Lactancia
Progesterona
Gestación
Sincronización
Glicoproteínas
Beef Cattle
Animal Reproduction
Suckling
Progesterone
Pregnancy
Synchronization
Glycoproteins
dc.description.none.fl_txt_mv The objective of the present study was to evaluate the effects of a synthetic eCG-like glycoprotein treatment, body condition score changes, and postpartum nutritional supplementation on follicular and luteal characteristics and pregnancy rates in suckled beef cows synchronized with a 7-d Co-Synch protocol. In Experiment I, 1218 suckled cows received a progesterone intravaginal device (1.0 g; IVD) and 100 μg GnRH on Day −10. On Day −3, IVDs were removed, and cows received 0.5 mg sodium cloprostenol and were randomly assigned to receive either 400 IU eCG-like glycoprotein (eCG-like; n = 602) or no eCG-like glycoprotein (Control; n = 616). On Day 0, 100 μg GnRH was given concurrently with TAI. Body condition score (BCS) was recorded on Day −10 and 35, and its change was calculated. Corpus luteum (CL) presence was evaluated on Day −10, and pregnancy (P/TAI) on Day 35. In cows without CL, eCG-like increased estrus expression rate (EER; 58.2 vs. 45.3 %; P = 0.01). In cows that lost BCS, eCG-like increased P/TAI (47.2 vs. 32.1 %; P = 0.01). In Experiment II, 72 cows, 21 d postpartum, were assigned to supplemented (SUP; 4 kg of corn daily) or non-supplemented (NSUP) diets for 80 days. Cows were subjected to the same synchronization protocol and eCG-like glycoprotein treatment described in Exp. I. Nutritional SUP increased (P ≤ 0.05) body weight and BCS. Dominant follicle (DF) growth tended to be greater in eCG-like group than Control (1.2 vs. 0.7 ± 0.3 mm/d; P = 0.08), while the SUP group exhibited greater ovulation rate and CL area compared with NSUP (P ≤ 0.03). The eCG-like treatment increased EER in cows without CL and P/TAI in those losing BCS. Although eCG-like tended to improve DF growth, no interaction was observed between nutritional and eCG-like treatment on follicular and luteal characteristics.
EEA Cuenca del Salado
Fil: Rodriguez, Alejandro Martin. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Cuenca del Salado; Argentina
Fil: Maresca, Sebastian. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Cuenca del Salado; Argentina
Fil: Lopez Valiente, Sebastian. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Cuenca del Salado; Argentina
Fil: Pérez Wallace, Santiago. Syntex S.A.; Argentina
Fil: Bilbao, Guillermina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Bilbao, Guillermina. Universidad Nacional de La Pampa. Facultad de Ciencias Veterinarias; Argentina
Fil: Long, Nathan M. Clemson University. Department of Animal and Veterinary Sciences; Estados Unidos
Fil: Meikle, Ana. Universidad de La República. Facultad de Veterinaria. Laboratorio de Endocrinología y Metabolismo Animal; Uruguay
Fil: Bartolome, Julian. Universidad Nacional de La Pampa. Facultad de Ciencias Veterinarias; Argentina
description The objective of the present study was to evaluate the effects of a synthetic eCG-like glycoprotein treatment, body condition score changes, and postpartum nutritional supplementation on follicular and luteal characteristics and pregnancy rates in suckled beef cows synchronized with a 7-d Co-Synch protocol. In Experiment I, 1218 suckled cows received a progesterone intravaginal device (1.0 g; IVD) and 100 μg GnRH on Day −10. On Day −3, IVDs were removed, and cows received 0.5 mg sodium cloprostenol and were randomly assigned to receive either 400 IU eCG-like glycoprotein (eCG-like; n = 602) or no eCG-like glycoprotein (Control; n = 616). On Day 0, 100 μg GnRH was given concurrently with TAI. Body condition score (BCS) was recorded on Day −10 and 35, and its change was calculated. Corpus luteum (CL) presence was evaluated on Day −10, and pregnancy (P/TAI) on Day 35. In cows without CL, eCG-like increased estrus expression rate (EER; 58.2 vs. 45.3 %; P = 0.01). In cows that lost BCS, eCG-like increased P/TAI (47.2 vs. 32.1 %; P = 0.01). In Experiment II, 72 cows, 21 d postpartum, were assigned to supplemented (SUP; 4 kg of corn daily) or non-supplemented (NSUP) diets for 80 days. Cows were subjected to the same synchronization protocol and eCG-like glycoprotein treatment described in Exp. I. Nutritional SUP increased (P ≤ 0.05) body weight and BCS. Dominant follicle (DF) growth tended to be greater in eCG-like group than Control (1.2 vs. 0.7 ± 0.3 mm/d; P = 0.08), while the SUP group exhibited greater ovulation rate and CL area compared with NSUP (P ≤ 0.03). The eCG-like treatment increased EER in cows without CL and P/TAI in those losing BCS. Although eCG-like tended to improve DF growth, no interaction was observed between nutritional and eCG-like treatment on follicular and luteal characteristics.
publishDate 2025
dc.date.none.fl_str_mv 2025-08
2026-07-17T11:54:50Z
2026-07-17T11:54:50Z
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/20.500.12123/27044
https://www.sciencedirect.com/science/article/abs/pii/S0093691X25001694
0093-691X
1879-3231
https://doi.org/10.1016/j.theriogenology.2025.117443
url http://hdl.handle.net/20.500.12123/27044
https://www.sciencedirect.com/science/article/abs/pii/S0093691X25001694
https://doi.org/10.1016/j.theriogenology.2025.117443
identifier_str_mv 0093-691X
1879-3231
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repograntAgreement/INTA/2023-PD-L01-I112, Biotecnologías reproductivas y plataforma de edición génica para animales de interés zootécnico.
dc.rights.none.fl_str_mv info:eu-repo/semantics/restrictedAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv restrictedAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv Theriogenology 242 : 117443. (August 2025)
reponame:INTA Digital (INTA)
instname:Instituto Nacional de Tecnología Agropecuaria
reponame_str INTA Digital (INTA)
collection INTA Digital (INTA)
instname_str Instituto Nacional de Tecnología Agropecuaria
repository.name.fl_str_mv INTA Digital (INTA) - Instituto Nacional de Tecnología Agropecuaria
repository.mail.fl_str_mv tripaldi.nicolas@inta.gob.ar
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