Pregnancy rate in lactating Bos indicus cows subjected to fixed-time artificial insemination and treated with different follicular growth inducers.
The objective of this experiment was to evaluate the effects of replacing eCG with FSH or FSH/LH on the diameter of ovulatory follicles (DOF) and the pregnancy rates (PR) of lactating Bos indicus cows subjected to a synchronization of ovulation protocol and fixed-time artificial insemination (FTAI) based on progesterone, estradiol benzoate (EB), PGF2α, and estradiol cypionate (EC). On day 0, primiparous and multiparous Nellore cows (n = 329) at 68 days postpartum were body condition scored (BCS) and received a P4 implant (PRIMER 1.0 g P4) plus 2 mg EB intramuscularly (IM). At day 8, the implant was removed, and 250 μg cloprostenol were injected IM along with 0.5 mg EC. At the time of implant removal, the animals were divided into one of four treatments: cows received (G1) 1 mL of saline solution IM (Control; n = 80); (G2) 300 IU eCG IM (ECG300; n = 84); (G3) 15 mg FSH IM (Folltropin; n = 82); and (G4) 30 IU FSH/LH IM (Pluset; n = 83); all cows were subjected to FTAI 48-54 h after implant removal (day 10). Transrectal ultrasonography was performed to measure the DOF to FTAI and to estimate the pregnancy rate on day 35. A statistical analysis examined the effects of the treatment, technician, semen, BCS, calf age and parity on PR to FTAI. There was no significant difference in PR and DOF among the treatment groups (G1, 41.3%, 13.1 mm; G2, 46.4%, 14.5 mm; G3, 46.3%, 14.2 mm; and G4, 48.2%, 14.3 mm), but PR was higher in multiparous than in primiparous cows. Commercial FSH solutions (Pluset or Folltropin) do not promote increases in PR or DOF of lactating Nellore cows and are equal to eCG in promoting growth in preovulatory follicles and elevating the PR in Nellore cows with a moderate BCS subjected to a progesterone-based FTAI protocol with EC.
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Language: | English eng |
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2014-07-29
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Subjects: | FSH, Multiparous, Primiparous., Nellore., |
Online Access: | http://www.alice.cnptia.embrapa.br/alice/handle/doc/991433 |
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dig-alice-doc-9914332017-08-16T01:59:55Z Pregnancy rate in lactating Bos indicus cows subjected to fixed-time artificial insemination and treated with different follicular growth inducers. NOGUEIRA, E. BATISTA, D. S. do N. COSTA FILHO, L. C. C. da DIAS, A. M. SILVA, J. C. B. ÍTAVO, L. C. V. ERIKLIS NOGUEIRA, CPAP; DAYANNA SCHIAVI DO NASC BATISTA, CPAP; LUIZ CARLOS CESAR DA COSTA FILHO, UFMS; ALEXANDRE MENEZES DIAS, UFMS; JULIANA CORRÊA BORGES SILVA, CPAP; LUIS CARLOS VINHAS ÍTAVO, UCDB. FSH Multiparous Primiparous. Nellore. The objective of this experiment was to evaluate the effects of replacing eCG with FSH or FSH/LH on the diameter of ovulatory follicles (DOF) and the pregnancy rates (PR) of lactating Bos indicus cows subjected to a synchronization of ovulation protocol and fixed-time artificial insemination (FTAI) based on progesterone, estradiol benzoate (EB), PGF2α, and estradiol cypionate (EC). On day 0, primiparous and multiparous Nellore cows (n = 329) at 68 days postpartum were body condition scored (BCS) and received a P4 implant (PRIMER 1.0 g P4) plus 2 mg EB intramuscularly (IM). At day 8, the implant was removed, and 250 μg cloprostenol were injected IM along with 0.5 mg EC. At the time of implant removal, the animals were divided into one of four treatments: cows received (G1) 1 mL of saline solution IM (Control; n = 80); (G2) 300 IU eCG IM (ECG300; n = 84); (G3) 15 mg FSH IM (Folltropin; n = 82); and (G4) 30 IU FSH/LH IM (Pluset; n = 83); all cows were subjected to FTAI 48-54 h after implant removal (day 10). Transrectal ultrasonography was performed to measure the DOF to FTAI and to estimate the pregnancy rate on day 35. A statistical analysis examined the effects of the treatment, technician, semen, BCS, calf age and parity on PR to FTAI. There was no significant difference in PR and DOF among the treatment groups (G1, 41.3%, 13.1 mm; G2, 46.4%, 14.5 mm; G3, 46.3%, 14.2 mm; and G4, 48.2%, 14.3 mm), but PR was higher in multiparous than in primiparous cows. Commercial FSH solutions (Pluset or Folltropin) do not promote increases in PR or DOF of lactating Nellore cows and are equal to eCG in promoting growth in preovulatory follicles and elevating the PR in Nellore cows with a moderate BCS subjected to a progesterone-based FTAI protocol with EC. 2014-07-29T11:11:11Z 2014-07-29T11:11:11Z 2014-07-29 2014 2017-11-24T11:11:11Z Separatas Revista Brasileira de Zootecnia, v. 43, n. 7, p. 358-362, 2014. 1806-9290 http://www.alice.cnptia.embrapa.br/alice/handle/doc/991433 en eng openAccess |
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FSH Multiparous Primiparous. Nellore. FSH Multiparous Primiparous. Nellore. |
spellingShingle |
FSH Multiparous Primiparous. Nellore. FSH Multiparous Primiparous. Nellore. NOGUEIRA, E. BATISTA, D. S. do N. COSTA FILHO, L. C. C. da DIAS, A. M. SILVA, J. C. B. ÍTAVO, L. C. V. Pregnancy rate in lactating Bos indicus cows subjected to fixed-time artificial insemination and treated with different follicular growth inducers. |
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The objective of this experiment was to evaluate the effects of replacing eCG with FSH or FSH/LH on the diameter of ovulatory follicles (DOF) and the pregnancy rates (PR) of lactating Bos indicus cows subjected to a synchronization of ovulation protocol and fixed-time artificial insemination (FTAI) based on progesterone, estradiol benzoate (EB), PGF2α, and estradiol cypionate (EC). On day 0, primiparous and multiparous Nellore cows (n = 329) at 68 days postpartum were body condition scored (BCS) and received a P4 implant (PRIMER 1.0 g P4) plus 2 mg EB intramuscularly (IM). At day 8, the implant was removed, and 250 μg cloprostenol were injected IM along with 0.5 mg EC. At the time of implant removal, the animals were divided into one of four treatments: cows received (G1) 1 mL of saline solution IM (Control; n = 80); (G2) 300 IU eCG IM (ECG300; n = 84); (G3) 15 mg FSH IM (Folltropin; n = 82); and (G4) 30 IU FSH/LH IM (Pluset; n = 83); all cows were subjected to FTAI 48-54 h after implant removal (day 10). Transrectal ultrasonography was performed to measure the DOF to FTAI and to estimate the pregnancy rate on day 35. A statistical analysis examined the effects of the treatment, technician, semen, BCS, calf age and parity on PR to FTAI. There was no significant difference in PR and DOF among the treatment groups (G1, 41.3%, 13.1 mm; G2, 46.4%, 14.5 mm; G3, 46.3%, 14.2 mm; and G4, 48.2%, 14.3 mm), but PR was higher in multiparous than in primiparous cows. Commercial FSH solutions (Pluset or Folltropin) do not promote increases in PR or DOF of lactating Nellore cows and are equal to eCG in promoting growth in preovulatory follicles and elevating the PR in Nellore cows with a moderate BCS subjected to a progesterone-based FTAI protocol with EC. |
author2 |
ERIKLIS NOGUEIRA, CPAP; DAYANNA SCHIAVI DO NASC BATISTA, CPAP; LUIZ CARLOS CESAR DA COSTA FILHO, UFMS; ALEXANDRE MENEZES DIAS, UFMS; JULIANA CORRÊA BORGES SILVA, CPAP; LUIS CARLOS VINHAS ÍTAVO, UCDB. |
author_facet |
ERIKLIS NOGUEIRA, CPAP; DAYANNA SCHIAVI DO NASC BATISTA, CPAP; LUIZ CARLOS CESAR DA COSTA FILHO, UFMS; ALEXANDRE MENEZES DIAS, UFMS; JULIANA CORRÊA BORGES SILVA, CPAP; LUIS CARLOS VINHAS ÍTAVO, UCDB. NOGUEIRA, E. BATISTA, D. S. do N. COSTA FILHO, L. C. C. da DIAS, A. M. SILVA, J. C. B. ÍTAVO, L. C. V. |
format |
Separatas |
topic_facet |
FSH Multiparous Primiparous. Nellore. |
author |
NOGUEIRA, E. BATISTA, D. S. do N. COSTA FILHO, L. C. C. da DIAS, A. M. SILVA, J. C. B. ÍTAVO, L. C. V. |
author_sort |
NOGUEIRA, E. |
title |
Pregnancy rate in lactating Bos indicus cows subjected to fixed-time artificial insemination and treated with different follicular growth inducers. |
title_short |
Pregnancy rate in lactating Bos indicus cows subjected to fixed-time artificial insemination and treated with different follicular growth inducers. |
title_full |
Pregnancy rate in lactating Bos indicus cows subjected to fixed-time artificial insemination and treated with different follicular growth inducers. |
title_fullStr |
Pregnancy rate in lactating Bos indicus cows subjected to fixed-time artificial insemination and treated with different follicular growth inducers. |
title_full_unstemmed |
Pregnancy rate in lactating Bos indicus cows subjected to fixed-time artificial insemination and treated with different follicular growth inducers. |
title_sort |
pregnancy rate in lactating bos indicus cows subjected to fixed-time artificial insemination and treated with different follicular growth inducers. |
publishDate |
2014-07-29 |
url |
http://www.alice.cnptia.embrapa.br/alice/handle/doc/991433 |
work_keys_str_mv |
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