Use of equine chorionic gonadotrophin in synchronised AI of seasonal-breeding, pasture-based, anoestrous dairy cattle

In seasonally calving dairy areas, a critical index of efficiency and profitability is the ability to maintain a short annual calving spread. In essence, this means that all cows need to conceive within 90 days of calving. Anovulatory anoestrus (AA) is a major barrier to reproductive performance und...

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Detalles Bibliográficos
Autores principales: Bryan, M.A., Bo, G.A., Heuer, C., Emslie, F.R.
Formato: Artículo PeerReviewed
Lenguaje:Español
Publicado: 2010
Materias:
SF Cultura de los animales
Acceso en línea:http://pa.bibdigital.ucc.edu.ar/5002/1/A_Bryan.pdf
Aporte de:
Producción Académica Universidad Católica de Córdoba (UCCor) de Universidad Católica de Córdoba
id I38-R144-5002
record_format dspace
spelling I38-R144-50022025-11-10T13:36:34Z http://pa.bibdigital.ucc.edu.ar/5002/ Use of equine chorionic gonadotrophin in synchronised AI of seasonal-breeding, pasture-based, anoestrous dairy cattle Bryan, M.A. Bo, G.A. Heuer, C. Emslie, F.R. SF Cultura de los animales In seasonally calving dairy areas, a critical index of efficiency and profitability is the ability to maintain a short annual calving spread. In essence, this means that all cows need to conceive within 90 days of calving. Anovulatory anoestrus (AA) is a major barrier to reproductive performance under these conditions and the successful treatment of AA is an important aspect of reproductive intervention. The present paper reviews regimens used to treat AA in New Zealand and reports on a large-scale field trial investigating the effects of equine chorionic gonadotrophin (eCG) within a proven efficacious treatment protocol. The administration of eCG at the time of removal of a progesterone-releasing device in an 8-day, oestradiol benzoate (EB)-based treatment protocol increased the percentage of cows in calf after 7 and 28 days of breeding. The interaction between cow age and treatment with eCG was significant, with cows over 5 years of age having higher conception rates (P ≤ 0.002) and 7 day in-calf rates (P ≤ 0.002) than cows on a standard 8-day treatment protocol without eCG. The addition of eCG to a standard 8-day EB/progesterone protocol can improve reproductive success in seasonally calving AA dairy cows. 2010-12-31 Artículo PeerReviewed application/pdf spa http://pa.bibdigital.ucc.edu.ar/5002/1/A_Bryan.pdf Bryan, M.A., Bo, G.A., Heuer, C. and Emslie, F.R. (2010) Use of equine chorionic gonadotrophin in synchronised AI of seasonal-breeding, pasture-based, anoestrous dairy cattle. Reproduction, Fertility and Development, 22 (1). pp. 126-131. ISSN 10313613 info:eu-repo/semantics/altIdentifier/doi/10.1071/RD09225
institution Universidad Católica de Córdoba
institution_str I-38
repository_str R-144
collection Producción Académica Universidad Católica de Córdoba (UCCor)
language Español
orig_language_str_mv spa
topic SF Cultura de los animales
spellingShingle SF Cultura de los animales
Bryan, M.A.
Bo, G.A.
Heuer, C.
Emslie, F.R.
Use of equine chorionic gonadotrophin in synchronised AI of seasonal-breeding, pasture-based, anoestrous dairy cattle
topic_facet SF Cultura de los animales
description In seasonally calving dairy areas, a critical index of efficiency and profitability is the ability to maintain a short annual calving spread. In essence, this means that all cows need to conceive within 90 days of calving. Anovulatory anoestrus (AA) is a major barrier to reproductive performance under these conditions and the successful treatment of AA is an important aspect of reproductive intervention. The present paper reviews regimens used to treat AA in New Zealand and reports on a large-scale field trial investigating the effects of equine chorionic gonadotrophin (eCG) within a proven efficacious treatment protocol. The administration of eCG at the time of removal of a progesterone-releasing device in an 8-day, oestradiol benzoate (EB)-based treatment protocol increased the percentage of cows in calf after 7 and 28 days of breeding. The interaction between cow age and treatment with eCG was significant, with cows over 5 years of age having higher conception rates (P ≤ 0.002) and 7 day in-calf rates (P ≤ 0.002) than cows on a standard 8-day treatment protocol without eCG. The addition of eCG to a standard 8-day EB/progesterone protocol can improve reproductive success in seasonally calving AA dairy cows.
format Artículo
PeerReviewed
author Bryan, M.A.
Bo, G.A.
Heuer, C.
Emslie, F.R.
author_facet Bryan, M.A.
Bo, G.A.
Heuer, C.
Emslie, F.R.
author_sort Bryan, M.A.
title Use of equine chorionic gonadotrophin in synchronised AI of seasonal-breeding, pasture-based, anoestrous dairy cattle
title_short Use of equine chorionic gonadotrophin in synchronised AI of seasonal-breeding, pasture-based, anoestrous dairy cattle
title_full Use of equine chorionic gonadotrophin in synchronised AI of seasonal-breeding, pasture-based, anoestrous dairy cattle
title_fullStr Use of equine chorionic gonadotrophin in synchronised AI of seasonal-breeding, pasture-based, anoestrous dairy cattle
title_full_unstemmed Use of equine chorionic gonadotrophin in synchronised AI of seasonal-breeding, pasture-based, anoestrous dairy cattle
title_sort use of equine chorionic gonadotrophin in synchronised ai of seasonal-breeding, pasture-based, anoestrous dairy cattle
publishDate 2010
url http://pa.bibdigital.ucc.edu.ar/5002/1/A_Bryan.pdf
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AT heuerc useofequinechorionicgonadotrophininsynchronisedaiofseasonalbreedingpasturebasedanoestrousdairycattle
AT emsliefr useofequinechorionicgonadotrophininsynchronisedaiofseasonalbreedingpasturebasedanoestrousdairycattle
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