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Registro Completo |
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Biblioteca(s): |
Embrapa Rondônia. |
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Data corrente: |
09/03/2018 |
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Data da última atualização: |
09/03/2018 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
PFEIFER, L. F. M.; CASTRO, N. A.; NEVES, P. M. A.; CESTARO, J. P.; SCHNEIDER, A. |
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Afiliação: |
LUIZ FRANCISCO MACHADO PFEIFER, CPAF-Rondonia; N.A. Castro, UFPel; P.M.A. Neves, FIMCA; J.P. Cestaro, FIMCA; A. Schneider, UFPel. |
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Título: |
Comparison between two estradiol-progesterone based protocols for timed artificial insemination in blocks in lactating Nelore cows. |
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Ano de publicação: |
2017 |
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Fonte/Imprenta: |
Animal Reproduction Science, v. 181, p. 125-129, 2017. |
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Idioma: |
Inglês |
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Conteúdo: |
The aim of this study was to compare the use of artificial insemination in time blocks (Artificial Insemination Blocks, AIB) using an 8 and 9 d estradiol-progesterone based protocol. In this experiment, lactating Nelore cows (n=253) were subjected to two estradiol-progesterone based TAI protocols. On the morning of Day 10 (8d group, n=124) or Day 11 (9d group, n=129), cows were examined by ultrasonography to evaluate the diameter of the preovulatory follicle and were inseminated once at one of the following time points, according to the diameter of the pre-ovulatory follicle (POF): Block 0 (POF≥15mm, TAI 0h after conventional TAI), Block 1 (POF 13.0-14.9mm, TAI 6h later), Block 2 (POF 10.1-12.9mm, TAI 24h later), and Block 3 (POF≤10.0mm, TAI 30h later). The pregnancy per AI (P/AI) did not differ between 8d and 9d groups (P>0.05). Considering only multiparous cows, however, P/AI tended to be greater in the 8d (64.1%) than in the 9d group (49.3%; P=0.08). Cows from the 9d group tended to have a larger POF than cows from the 8d group (P=0.07). In conclusion, these results provide evidence that there is no difference between 8d or 9d protocols when using the AIB technique. Use of the 8d estradiol-progesterone based protocol, however, tended to increase pregnancy in multiparous cows. |
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Palavras-Chave: |
Diâmetro folicular; Follicular diameter; Ultrassonografia. |
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Thesagro: |
Ovulação; Reprodução Animal. |
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Thesaurus Nal: |
cattle; ovulation; ultrasonography. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02121naa a2200265 a 4500
001 2088885
005 2018-03-09
008 2017 bl uuuu u00u1 u #d
100 1 $aPFEIFER, L. F. M.
245 $aComparison between two estradiol-progesterone based protocols for timed artificial insemination in blocks in lactating Nelore cows.$h[electronic resource]
260 $c2017
520 $aThe aim of this study was to compare the use of artificial insemination in time blocks (Artificial Insemination Blocks, AIB) using an 8 and 9 d estradiol-progesterone based protocol. In this experiment, lactating Nelore cows (n=253) were subjected to two estradiol-progesterone based TAI protocols. On the morning of Day 10 (8d group, n=124) or Day 11 (9d group, n=129), cows were examined by ultrasonography to evaluate the diameter of the preovulatory follicle and were inseminated once at one of the following time points, according to the diameter of the pre-ovulatory follicle (POF): Block 0 (POF≥15mm, TAI 0h after conventional TAI), Block 1 (POF 13.0-14.9mm, TAI 6h later), Block 2 (POF 10.1-12.9mm, TAI 24h later), and Block 3 (POF≤10.0mm, TAI 30h later). The pregnancy per AI (P/AI) did not differ between 8d and 9d groups (P>0.05). Considering only multiparous cows, however, P/AI tended to be greater in the 8d (64.1%) than in the 9d group (49.3%; P=0.08). Cows from the 9d group tended to have a larger POF than cows from the 8d group (P=0.07). In conclusion, these results provide evidence that there is no difference between 8d or 9d protocols when using the AIB technique. Use of the 8d estradiol-progesterone based protocol, however, tended to increase pregnancy in multiparous cows.
650 $acattle
650 $aovulation
650 $aultrasonography
650 $aOvulação
650 $aReprodução Animal
653 $aDiâmetro folicular
653 $aFollicular diameter
653 $aUltrassonografia
700 1 $aCASTRO, N. A.
700 1 $aNEVES, P. M. A.
700 1 $aCESTARO, J. P.
700 1 $aSCHNEIDER, A.
773 $tAnimal Reproduction Science$gv. 181, p. 125-129, 2017.
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Registro original: |
Embrapa Rondônia (CPAF-RO) |
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