| |
|
|
 | Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Leite. Para informações adicionais entre em contato com rosangela.lacerda@embrapa.br. |
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Gado de Leite; Embrapa Rondônia. |
|
Data corrente: |
16/10/2025 |
|
Data da última atualização: |
16/10/2025 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Autoria: |
NOLETO, G. C. S.; SILVA, S. A. de S.; BARBOSA, I. P.; SIQUEIRA, L. G. B.; GASPERIN, B. G.; ROVANI, M. T.; PFEIFER, L. F. M. |
|
Afiliação: |
GABRIELLY CRISTINA SANTOS NOLETO, UNIVERSIDADE FEDERAL DE RONDÔNIA; SAMIRA ALVES DE SOUZA SILVA, UNIVERSIDADE FEDERAL DE PELOTAS; INGRID PEDRAÇA BARBOSA, UNIVERSIDADE FEDERAL DO ACRE; LUIZ GUSTAVO BRUNO SIQUEIRA, CNPGL; BERNARDO GARZIERA GASPERIN, UNIVERSIDADE FEDERAL DE PELOTAS; MONIQUE TOMAZELE ROVANI, UNIVERSIDADE FEDERAL DO RIO GRANDE DO SUL; LUIZ FRANCISCO MACHADO PFEIFER, CPAF-RO. |
|
Título: |
Effect of EC-GnRH34 timed AI protocol on ovulation synchrony and fertility in crossbred Girolando dairy cows. |
|
Ano de publicação: |
2025 |
|
Fonte/Imprenta: |
Tropical Animal Health and Production, v. 57, n. 8, article 436, Nov. 2025. |
|
ISSN: |
0049-4747 |
|
DOI: |
https://doi.org/10.1007/s11250-025-04681-4 |
|
Idioma: |
Inglês |
|
Conteúdo: |
The objective of the present study was to evaluate whether the inclusion of a gonadotropin-releasing hormone (GnRH) treatment at a novel time (34 h) after intravaginal progesterone device (IPD) removal improves ovulation synchrony and increases fertility in crossbred Girolando dairy cows (B. taurus×B. indicus). A total of 226 crossbred Girolando lactating cows (predominantly 5/8, ¾, and ½ Holstein blood share) were subjected to an estradiol-progesterone based timed artificial insemination (TAI) protocol. At the IPD removal, all cows were treated with 1mg i.m estradiol cypionate (EC), and then allocated into two groups to receive either 2.5mL of saline solution (EC-Control, n=111) or 10.5μg i.m. buserelin acetate (GnRH analogue) 34 h after IPD removal (EC-GnRH34, n=115). A subgroup of 30 cows was examined by ultrasonography at 12h intervals to determine the time of ovulation after IPD removal. All cows were subjected to TAI 48 h after IPD removal. Cows in the EC-GnRH34 group ovulated earlier (60.4±3·8 h, p=0.03) and more synchronously (100%; p=0.006) than EC-Control cows (69.8±4·0 h and 60%). Females submitted to the EC-GnRH34 protocol had 42.6% pregnancy per AI (P/AI) compared with 35.1% for the ones treated with EC only (EC-Control, p=0.24). In conclusion, the present study demonstrated that the ovulation synchrony is optimized with the use of GnRH 34h after IPD removal. Fertility to the TAI protocol, however, was not significantly improved in comparison with cows treated with a single ovulation inducer, EC. MenosThe objective of the present study was to evaluate whether the inclusion of a gonadotropin-releasing hormone (GnRH) treatment at a novel time (34 h) after intravaginal progesterone device (IPD) removal improves ovulation synchrony and increases fertility in crossbred Girolando dairy cows (B. taurus×B. indicus). A total of 226 crossbred Girolando lactating cows (predominantly 5/8, ¾, and ½ Holstein blood share) were subjected to an estradiol-progesterone based timed artificial insemination (TAI) protocol. At the IPD removal, all cows were treated with 1mg i.m estradiol cypionate (EC), and then allocated into two groups to receive either 2.5mL of saline solution (EC-Control, n=111) or 10.5μg i.m. buserelin acetate (GnRH analogue) 34 h after IPD removal (EC-GnRH34, n=115). A subgroup of 30 cows was examined by ultrasonography at 12h intervals to determine the time of ovulation after IPD removal. All cows were subjected to TAI 48 h after IPD removal. Cows in the EC-GnRH34 group ovulated earlier (60.4±3·8 h, p=0.03) and more synchronously (100%; p=0.006) than EC-Control cows (69.8±4·0 h and 60%). Females submitted to the EC-GnRH34 protocol had 42.6% pregnancy per AI (P/AI) compared with 35.1% for the ones treated with EC only (EC-Control, p=0.24). In conclusion, the present study demonstrated that the ovulation synchrony is optimized with the use of GnRH 34h after IPD removal. Fertility to the TAI protocol, however, was not significantly improved in comparison with cows treated w... Mostrar Tudo |
|
Thesagro: |
Controle Hormonal; Fertilidade Animal; Gado Leiteiro; Gonadotrofina; Ovulação. |
|
Thesaurus Nal: |
Animal fertility; Dairy cows; Girolando; Gonadotropins; Hormonal regulation; Ovulation. |
|
Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
|
Marc: |
LEADER 02597naa a2200349 a 4500
001 2179733
005 2025-10-16
008 2025 bl uuuu u00u1 u #d
022 $a0049-4747
024 7 $ahttps://doi.org/10.1007/s11250-025-04681-4$2DOI
100 1 $aNOLETO, G. C. S.
245 $aEffect of EC-GnRH34 timed AI protocol on ovulation synchrony and fertility in crossbred Girolando dairy cows.$h[electronic resource]
260 $c2025
520 $aThe objective of the present study was to evaluate whether the inclusion of a gonadotropin-releasing hormone (GnRH) treatment at a novel time (34 h) after intravaginal progesterone device (IPD) removal improves ovulation synchrony and increases fertility in crossbred Girolando dairy cows (B. taurus×B. indicus). A total of 226 crossbred Girolando lactating cows (predominantly 5/8, ¾, and ½ Holstein blood share) were subjected to an estradiol-progesterone based timed artificial insemination (TAI) protocol. At the IPD removal, all cows were treated with 1mg i.m estradiol cypionate (EC), and then allocated into two groups to receive either 2.5mL of saline solution (EC-Control, n=111) or 10.5μg i.m. buserelin acetate (GnRH analogue) 34 h after IPD removal (EC-GnRH34, n=115). A subgroup of 30 cows was examined by ultrasonography at 12h intervals to determine the time of ovulation after IPD removal. All cows were subjected to TAI 48 h after IPD removal. Cows in the EC-GnRH34 group ovulated earlier (60.4±3·8 h, p=0.03) and more synchronously (100%; p=0.006) than EC-Control cows (69.8±4·0 h and 60%). Females submitted to the EC-GnRH34 protocol had 42.6% pregnancy per AI (P/AI) compared with 35.1% for the ones treated with EC only (EC-Control, p=0.24). In conclusion, the present study demonstrated that the ovulation synchrony is optimized with the use of GnRH 34h after IPD removal. Fertility to the TAI protocol, however, was not significantly improved in comparison with cows treated with a single ovulation inducer, EC.
650 $aAnimal fertility
650 $aDairy cows
650 $aGirolando
650 $aGonadotropins
650 $aHormonal regulation
650 $aOvulation
650 $aControle Hormonal
650 $aFertilidade Animal
650 $aGado Leiteiro
650 $aGonadotrofina
650 $aOvulação
700 1 $aSILVA, S. A. de S.
700 1 $aBARBOSA, I. P.
700 1 $aSIQUEIRA, L. G. B.
700 1 $aGASPERIN, B. G.
700 1 $aROVANI, M. T.
700 1 $aPFEIFER, L. F. M.
773 $tTropical Animal Health and Production$gv. 57, n. 8, article 436, Nov. 2025.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Rondônia (CPAF-RO) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
| Registros recuperados : 1 | |
| Registros recuperados : 1 | |
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
