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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Leite; Embrapa Recursos Genéticos e Biotecnologia; Embrapa Rondônia. |
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Data corrente: |
09/09/2024 |
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Data da última atualização: |
09/09/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BAGON, A.; SIQUEIRA, L. G. B.; VIANA, J. H. M.; PFEIFER, L. F. M. |
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Afiliação: |
AUDREY BAGON, UNIVERSIDADE FEDERAL DO ACRE; LUIZ GUSTAVO BRUNO SIQUEIRA, CNPGL; JOAO HENRIQUE MOREIRA VIANA, CENARGEN; LUIZ FRANCISCO MACHADO PFEIFER, CPAF-RO. |
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Título: |
Optimisation of early pregnancy diagnosis and resynchronisation in beef cows. |
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Ano de publicação: |
2024 |
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Fonte/Imprenta: |
Reproduction in Domestic Animals, v. 59, e14719, 2024. |
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DOI: |
https://doi.org/10.1111/rda.14719 |
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Idioma: |
Inglês |
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Conteúdo: |
The objectives of this study were (1) to investigate the effects of the preovulatory follicle (POF) size on the accuracy of Dopplerbased early pregnancy detection, and (2) to determine whether the removal of PGF2α (PGF) treatment during the resynchronisation protocol would affect fertility in beef cows. In Experiment 1, Nelore suckling cows (n=224) were enrolled in an estradiol-progesterone–based timed artificial insemination (TAI) protocol. At TAI, cows were separated based on the range of POF diameters, as follows: ≤11.0mm (n=50), 11.1–12.9mm (n=64), 13.0–14.4mm (n=62) and ≥14.5mm (n=48). On day 22 after TAI, the corpus luteum (CL) blood flow (CLBF) of all cows was examined by colour Doppler ultrasonography to diagnose nonpregnant cows. The cows with the largest POF had the greatest positive predictive value (88.6%; 31 of 35) and diagnostic accuracy (91.7%; 44 of 48). In Experiment 2, Nelore cows (n=233) were subjected to the same TAI protocol. Fourteen days after TAI, all cows were started on a resynchronisation protocol. Cows diagnosed as nonpregnant based on CLBF, on day 22, received 0.5mg estradiol cypionate intramuscular (im) and were assigned to receive either 150μg of PGF (PGF; n=50) or 2mL of saline (control; n=47). Cows treated with PGF had a P/AI of 30.0% compared with a 48.9% P/AI in controls (p=0.06). Our findings demonstrate that the POF size affects the accuracy of a CLBF-based early pregnancy diagnosis and that the removal of PGF treatment from the resynchronisation protocol tended to increase P/AI of the second TAI. MenosThe objectives of this study were (1) to investigate the effects of the preovulatory follicle (POF) size on the accuracy of Dopplerbased early pregnancy detection, and (2) to determine whether the removal of PGF2α (PGF) treatment during the resynchronisation protocol would affect fertility in beef cows. In Experiment 1, Nelore suckling cows (n=224) were enrolled in an estradiol-progesterone–based timed artificial insemination (TAI) protocol. At TAI, cows were separated based on the range of POF diameters, as follows: ≤11.0mm (n=50), 11.1–12.9mm (n=64), 13.0–14.4mm (n=62) and ≥14.5mm (n=48). On day 22 after TAI, the corpus luteum (CL) blood flow (CLBF) of all cows was examined by colour Doppler ultrasonography to diagnose nonpregnant cows. The cows with the largest POF had the greatest positive predictive value (88.6%; 31 of 35) and diagnostic accuracy (91.7%; 44 of 48). In Experiment 2, Nelore cows (n=233) were subjected to the same TAI protocol. Fourteen days after TAI, all cows were started on a resynchronisation protocol. Cows diagnosed as nonpregnant based on CLBF, on day 22, received 0.5mg estradiol cypionate intramuscular (im) and were assigned to receive either 150μg of PGF (PGF; n=50) or 2mL of saline (control; n=47). Cows treated with PGF had a P/AI of 30.0% compared with a 48.9% P/AI in controls (p=0.06). Our findings demonstrate that the POF size affects the accuracy of a CLBF-based early pregnancy diagnosis and that the removal of PGF treatment from the resynchro... Mostrar Tudo |
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Palavras-Chave: |
Early pregnancy; Fluxo sanguíneo; Prenhez precoce; Ultrasonografia. |
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Thesagro: |
Diagnostico; Reprodução Animal; Vaca de Corte. |
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Thesaurus Nal: |
Animal reproduction; Beef cows; Blood flow; Corpus luteum; Pregnancy diagnosis; Ultrasonography. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02511naa a2200325 a 4500
001 2167241
005 2024-09-09
008 2024 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1111/rda.14719$2DOI
100 1 $aBAGON, A.
245 $aOptimisation of early pregnancy diagnosis and resynchronisation in beef cows.$h[electronic resource]
260 $c2024
520 $aThe objectives of this study were (1) to investigate the effects of the preovulatory follicle (POF) size on the accuracy of Dopplerbased early pregnancy detection, and (2) to determine whether the removal of PGF2α (PGF) treatment during the resynchronisation protocol would affect fertility in beef cows. In Experiment 1, Nelore suckling cows (n=224) were enrolled in an estradiol-progesterone–based timed artificial insemination (TAI) protocol. At TAI, cows were separated based on the range of POF diameters, as follows: ≤11.0mm (n=50), 11.1–12.9mm (n=64), 13.0–14.4mm (n=62) and ≥14.5mm (n=48). On day 22 after TAI, the corpus luteum (CL) blood flow (CLBF) of all cows was examined by colour Doppler ultrasonography to diagnose nonpregnant cows. The cows with the largest POF had the greatest positive predictive value (88.6%; 31 of 35) and diagnostic accuracy (91.7%; 44 of 48). In Experiment 2, Nelore cows (n=233) were subjected to the same TAI protocol. Fourteen days after TAI, all cows were started on a resynchronisation protocol. Cows diagnosed as nonpregnant based on CLBF, on day 22, received 0.5mg estradiol cypionate intramuscular (im) and were assigned to receive either 150μg of PGF (PGF; n=50) or 2mL of saline (control; n=47). Cows treated with PGF had a P/AI of 30.0% compared with a 48.9% P/AI in controls (p=0.06). Our findings demonstrate that the POF size affects the accuracy of a CLBF-based early pregnancy diagnosis and that the removal of PGF treatment from the resynchronisation protocol tended to increase P/AI of the second TAI.
650 $aAnimal reproduction
650 $aBeef cows
650 $aBlood flow
650 $aCorpus luteum
650 $aPregnancy diagnosis
650 $aUltrasonography
650 $aDiagnostico
650 $aReprodução Animal
650 $aVaca de Corte
653 $aEarly pregnancy
653 $aFluxo sanguíneo
653 $aPrenhez precoce
653 $aUltrasonografia
700 1 $aSIQUEIRA, L. G. B.
700 1 $aVIANA, J. H. M.
700 1 $aPFEIFER, L. F. M.
773 $tReproduction in Domestic Animals$gv. 59, e14719, 2024.
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Registro original: |
Embrapa Rondônia (CPAF-RO) |
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