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)...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Zootecnia
2014-07-01
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| Series: | Revista Brasileira de Zootecnia |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000700358&lng=en&tlng=en |
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| author | Ériklis Nogueira Dayanna Schiavi do Nascimento Batista Luiz Carlos Cesar da Costa Filho Alexandre Menezes Dias Juliana Corrêa Borges Silva Luís Carlos Vinhas Ítavo |
| author_facet | Ériklis Nogueira Dayanna Schiavi do Nascimento Batista Luiz Carlos Cesar da Costa Filho Alexandre Menezes Dias Juliana Corrêa Borges Silva Luís Carlos Vinhas Ítavo |
| author_sort | Ériklis Nogueira |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-23T05:57:10Z |
| format | Article |
| id | doaj.art-89999682ecfd42f9a62ecee790cd3404 |
| institution | Directory Open Access Journal |
| issn | 1806-9290 |
| language | English |
| last_indexed | 2024-12-23T05:57:10Z |
| publishDate | 2014-07-01 |
| publisher | Sociedade Brasileira de Zootecnia |
| record_format | Article |
| series | Revista Brasileira de Zootecnia |
| spelling | doaj.art-89999682ecfd42f9a62ecee790cd34042022-12-21T17:57:47ZengSociedade Brasileira de ZootecniaRevista Brasileira de Zootecnia1806-92902014-07-0143735836210.1590/S1516-35982014000700003S1516-35982014000700358Pregnancy rate in lactating Bos indicus cows subjected to fixed-time artificial insemination and treated with different follicular growth inducersÉriklis NogueiraDayanna Schiavi do Nascimento BatistaLuiz Carlos Cesar da Costa FilhoAlexandre Menezes DiasJuliana Corrêa Borges SilvaLuís Carlos Vinhas ÍtavoThe 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.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000700358&lng=en&tlng=enFSHmultiparousNelloreprimiparous |
| spellingShingle | Ériklis Nogueira Dayanna Schiavi do Nascimento Batista Luiz Carlos Cesar da Costa Filho Alexandre Menezes Dias Juliana Corrêa Borges Silva Luís Carlos Vinhas Ítavo Pregnancy rate in lactating Bos indicus cows subjected to fixed-time artificial insemination and treated with different follicular growth inducers Revista Brasileira de Zootecnia FSH multiparous Nellore primiparous |
| title | 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_short | 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 |
| topic | FSH multiparous Nellore primiparous |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000700358&lng=en&tlng=en |
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