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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
31/10/2007 |
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Data da última atualização: |
17/01/2024 |
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Autoria: |
KRIDLI, R. T.; HUSEIN, M. Q.; MUHDI, H. A.; AL-KHAZALEH, J. M. |
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Título: |
Reproductive performance of hormonally-treated anestrous Awassi ewes. |
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Ano de publicação: |
2006 |
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Fonte/Imprenta: |
Animal Reproduction, v. 3, n. 3, p. 347-352, jul./set. 2006. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: An experiment was conducted to evaluate the effect of administering melatonin alone or in combination with a progestagen and equine chorionicgonadotropin (eCG) on reproductive performance and inducing estrus in Awassi ewes. Fifty-nine, multiparous, winter-lambing Awassi ewes, ranging from 3 to 6 years of age, were randomly assigned during the late anestrous period (Spring) to one of six treatment groups as follows: no treatment (CON; n = 9), melatonin implant only (M; n = 10), flourogestone acetate (FGA) sponge only (P; n = 10), melatonin implant plus FGA sponge (MP; n = 10), FGA sponge plus eCG (PE; n = 10), or melatonin implant plus FGA sponge and eCG (MPE; n = 10). Ewes in P, MP, PE, and MPE groups were fitted with intravaginal progestagen sponges for 14 days. On the day of sponge removal, each ewe in the PE and MPE groups received a 600-IU dose of eCG. Ewes in the M, MP, and MPE groups received subcutaneous melatonin implants (18 mg melatonin) 36 days before sponge insertion. Estrus expression was lower (P < 0.001) in the CON and M groups than in the remaining groups. The interval to onset of estrus was shorter (P < 0.001) in the PE and MPE ewes compared to ewes in the remaining treatments. Ewes in the P, PE, and MPE groups lambed earlier (P < 0.01) than those in the remaining groups. Fecundity during the induced estrus was greater (P < 0.05) in the PE and MPE groups than the CON, M, and MP groups. The overall lambing rate during the two estrous cycles following sponge removal was similar among all groups. The overall prolificacy and litter birth weight were greater (P < 0.05) in the groups that received eCG. Results of the present study indicate that melatonin alone failed to induce estrus in a manner similar to FGA-primed ewes. Melatonin administration in combination with FGA and eCG can be successfully applied to improve induced estrus reproductive parameters in sheep. MenosAbstract: An experiment was conducted to evaluate the effect of administering melatonin alone or in combination with a progestagen and equine chorionicgonadotropin (eCG) on reproductive performance and inducing estrus in Awassi ewes. Fifty-nine, multiparous, winter-lambing Awassi ewes, ranging from 3 to 6 years of age, were randomly assigned during the late anestrous period (Spring) to one of six treatment groups as follows: no treatment (CON; n = 9), melatonin implant only (M; n = 10), flourogestone acetate (FGA) sponge only (P; n = 10), melatonin implant plus FGA sponge (MP; n = 10), FGA sponge plus eCG (PE; n = 10), or melatonin implant plus FGA sponge and eCG (MPE; n = 10). Ewes in P, MP, PE, and MPE groups were fitted with intravaginal progestagen sponges for 14 days. On the day of sponge removal, each ewe in the PE and MPE groups received a 600-IU dose of eCG. Ewes in the M, MP, and MPE groups received subcutaneous melatonin implants (18 mg melatonin) 36 days before sponge insertion. Estrus expression was lower (P < 0.001) in the CON and M groups than in the remaining groups. The interval to onset of estrus was shorter (P < 0.001) in the PE and MPE ewes compared to ewes in the remaining treatments. Ewes in the P, PE, and MPE groups lambed earlier (P < 0.01) than those in the remaining groups. Fecundity during the induced estrus was greater (P < 0.05) in the PE and MPE groups than the CON, M, and MP groups. The overall lambing rate during the two estrous cycles followin... Mostrar Tudo |
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Palavras-Chave: |
Anestro; Performance reprodutiva. |
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Thesagro: |
Endocrinologia; Gonadotrofina; Hormônio; Ovário; Ovelha; Ovino; Reprodução Animal. |
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Categoria do assunto: |
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Marc: |
LEADER 02631naa a2200265 a 4500
001 1520487
005 2024-01-17
008 2006 bl uuuu u00u1 u #d
100 1 $aKRIDLI, R. T.
245 $aReproductive performance of hormonally-treated anestrous Awassi ewes.
260 $c2006
520 $aAbstract: An experiment was conducted to evaluate the effect of administering melatonin alone or in combination with a progestagen and equine chorionicgonadotropin (eCG) on reproductive performance and inducing estrus in Awassi ewes. Fifty-nine, multiparous, winter-lambing Awassi ewes, ranging from 3 to 6 years of age, were randomly assigned during the late anestrous period (Spring) to one of six treatment groups as follows: no treatment (CON; n = 9), melatonin implant only (M; n = 10), flourogestone acetate (FGA) sponge only (P; n = 10), melatonin implant plus FGA sponge (MP; n = 10), FGA sponge plus eCG (PE; n = 10), or melatonin implant plus FGA sponge and eCG (MPE; n = 10). Ewes in P, MP, PE, and MPE groups were fitted with intravaginal progestagen sponges for 14 days. On the day of sponge removal, each ewe in the PE and MPE groups received a 600-IU dose of eCG. Ewes in the M, MP, and MPE groups received subcutaneous melatonin implants (18 mg melatonin) 36 days before sponge insertion. Estrus expression was lower (P < 0.001) in the CON and M groups than in the remaining groups. The interval to onset of estrus was shorter (P < 0.001) in the PE and MPE ewes compared to ewes in the remaining treatments. Ewes in the P, PE, and MPE groups lambed earlier (P < 0.01) than those in the remaining groups. Fecundity during the induced estrus was greater (P < 0.05) in the PE and MPE groups than the CON, M, and MP groups. The overall lambing rate during the two estrous cycles following sponge removal was similar among all groups. The overall prolificacy and litter birth weight were greater (P < 0.05) in the groups that received eCG. Results of the present study indicate that melatonin alone failed to induce estrus in a manner similar to FGA-primed ewes. Melatonin administration in combination with FGA and eCG can be successfully applied to improve induced estrus reproductive parameters in sheep.
650 $aEndocrinologia
650 $aGonadotrofina
650 $aHormônio
650 $aOvário
650 $aOvelha
650 $aOvino
650 $aReprodução Animal
653 $aAnestro
653 $aPerformance reprodutiva
700 1 $aHUSEIN, M. Q.
700 1 $aMUHDI, H. A.
700 1 $aAL-KHAZALEH, J. M.
773 $tAnimal Reproduction$gv. 3, n. 3, p. 347-352, jul./set. 2006.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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