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| 18. |  | SILVEIRA, P. A. S.; PEGORARO, L. M. C.; BUTLER, W. R.; CORREA, M. N.; SCHNEIDER, A. Effect of IGF-1 SnaBI polymorphism on reproductive parameters and metabolic parameters in dairy cows. Animal Reproduction., v.12, n.3, p. 582, Jul./Sept. 2015. Publicado: Proceedings of the 29th Annual Meeting of the Brazilian Embryo Technology Society (SBTE); Gramado, RS, Brazil, August 20th to 23rd, 2015, and 31st Meeting of the European Embryo Transfer Association (AETE); Ghent, Belgium,...| Biblioteca(s): Embrapa Clima Temperado. |
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| Registros recuperados : 113 | |
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Registro Completo
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Biblioteca(s): |
Embrapa Rondônia. |
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Data corrente: |
02/06/2022 |
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Data da última atualização: |
02/06/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
PFEIFER, L. F. M.; GASPERIN, B. G.; CESTARO, J. P.; SCHNEIDER, A. |
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Afiliação: |
LUIZ FRANCISCO MACHADO PFEIFER, CPAF-RO; B. G. GASPERIN, Universidade Federal de Pelotas (UFPel); J. P. CESTARO, Universidade Federal do Acre (Ufac); A. SCHNEIDER, Universidade Federal de Pelotas (UFPel). |
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Título: |
Postponing TAI in beef cows with small preovulatory follicles. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
Animal Reproduction Science, v. 242, 107006, 2022. |
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ISSN: |
0378-4320 |
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DOI: |
https://doi.org/10.1016/j.anireprosci.2022.107006 |
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Idioma: |
Inglês |
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Conteúdo: |
The aims of this study were (1) to establish an optimal cut-off point for evaluating the effect of the preovulatory follicle (POF) diameter in timed AI (TAI) programs, and (2) to evaluate the effect of
postponing TAI in cows with smaller follicles on pregnancy per AI (P/AI). In Study 1, Nelore cows (n = 426) were subjected to an estradiol-progesterone (P4) based TAI protocol. The diameter of
POF was measured at TAI, 48 h after P4 insert removal. From the ROC curves for determining the relationship between the POF diameter and pregnancy, the cut-off was 11 mm (P < 0.001). Cows
with larger POF had greater (P < 0.05) P/AI (62.5%) than cows with smaller POF (34.8%). In Study 2, Nelore cows (n = 1257) were subjected to the same TAI protocol as in Study 1. Before TAI, cows were separated according to POF diameter in three groups: (1) Larger POF (LP, n = 873; POF ≥11 mm), (2) Smaller POF 0 h (SP0, n = 195; POF <11 mm), and (3) Smaller POF 24 h (SP24, n = 189; POF <11 mm). Cows in the LP and SP0 were TAI at 48 h and cows in the SP24 group were TAI at 72 h after P4 insert removal. Cows in the LP group had the greatest (P < 0.05) P/AI (60.25%), followed by cows in the SP24 group (41.8%), while cows in the SP0 group had the lowest P/AI (31.8%). In conclusion, cows with smaller follicles have lower P/AI, but postponing the TAI by 24 h in these cows increases P/AI. |
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Palavras-Chave: |
Diâmetro do folículo; Folículos pré-ovulatórios; Follicular diameter; Preovulatory follicles. |
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Thesagro: |
Ovulação; Reprodução Animal; Vaca de Corte. |
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Thesaurus NAL: |
Animal reproduction; Beef cows; Ovulation. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1143679/1/cpafro-18765.pdf
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Marc: |
LEADER 02283naa a2200301 a 4500
001 2143679
005 2022-06-02
008 2022 bl uuuu u00u1 u #d
022 $a0378-4320
024 7 $ahttps://doi.org/10.1016/j.anireprosci.2022.107006$2DOI
100 1 $aPFEIFER, L. F. M.
245 $aPostponing TAI in beef cows with small preovulatory follicles.$h[electronic resource]
260 $c2022
520 $aThe aims of this study were (1) to establish an optimal cut-off point for evaluating the effect of the preovulatory follicle (POF) diameter in timed AI (TAI) programs, and (2) to evaluate the effect of postponing TAI in cows with smaller follicles on pregnancy per AI (P/AI). In Study 1, Nelore cows (n = 426) were subjected to an estradiol-progesterone (P4) based TAI protocol. The diameter of POF was measured at TAI, 48 h after P4 insert removal. From the ROC curves for determining the relationship between the POF diameter and pregnancy, the cut-off was 11 mm (P < 0.001). Cows with larger POF had greater (P < 0.05) P/AI (62.5%) than cows with smaller POF (34.8%). In Study 2, Nelore cows (n = 1257) were subjected to the same TAI protocol as in Study 1. Before TAI, cows were separated according to POF diameter in three groups: (1) Larger POF (LP, n = 873; POF ≥11 mm), (2) Smaller POF 0 h (SP0, n = 195; POF <11 mm), and (3) Smaller POF 24 h (SP24, n = 189; POF <11 mm). Cows in the LP and SP0 were TAI at 48 h and cows in the SP24 group were TAI at 72 h after P4 insert removal. Cows in the LP group had the greatest (P < 0.05) P/AI (60.25%), followed by cows in the SP24 group (41.8%), while cows in the SP0 group had the lowest P/AI (31.8%). In conclusion, cows with smaller follicles have lower P/AI, but postponing the TAI by 24 h in these cows increases P/AI.
650 $aAnimal reproduction
650 $aBeef cows
650 $aOvulation
650 $aOvulação
650 $aReprodução Animal
650 $aVaca de Corte
653 $aDiâmetro do folículo
653 $aFolículos pré-ovulatórios
653 $aFollicular diameter
653 $aPreovulatory follicles
700 1 $aGASPERIN, B. G.
700 1 $aCESTARO, J. P.
700 1 $aSCHNEIDER, A.
773 $tAnimal Reproduction Science$gv. 242, 107006, 2022.
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Embrapa Rondônia (CPAF-RO) |
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