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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
24/09/2004 |
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Data da última atualização: |
12/07/2010 |
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Autoria: |
BARRET, D. M. W.; BARTLEWSKI, P. M.; COOK, S. J.; RAWLINGS, N. C. |
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Título: |
Ultrasound and endocrine evaluation of the ovarian response to PGF2alpha given at different stages of the luteal phase in ewes. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Theriogenology, v. 58, n. 7, p. 1409-1424, 2002. |
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Idioma: |
Inglês |
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Conteúdo: |
The purpose of this study was to evaluate the ovarian response of ewes to two treatments with PGF2a using transrectal ovarian ultrasonography and hormone measurements. Fifteen milligrams of PGF2a was given to six cyclic Western White Face (WWF) ewes early in the estrous cycle (Days 4 to 7) and to six late in the cycle (Days 10 to 12 after ovulation), and a second treatment was given 9 days after the first. Ultrasound scanning and blood sampling started 7 days prior to the first PGF2a treatment and ended 10 days (scanning) or 19 days (blood sampling) after the second PGF2a treatment, for both groups of ewes. Mean ovulation rate (2.6+0.7) did Dot differ significantly between the ewes first treated early or late in the cycle, or after the first or second treatments with PGF2a The time from treatment to ovulation was longer in ewes first treated early (4.0+0.3 days) compared to late (2.8 + 0.4 days) in the cycle (P < 0.05). Both the number of ovulations (range: 0-7) and the time from treatment to ovulation (range: 1-9 days) were highly variable. This variability appeared to be due to the extension of the life span of ovulating follicles that emerged prior to PGF2a administration and also ovulation of some follicles that emerged after treatment. When results for first and second treatments were pooled, the total number of follicles =5 mm in diameter on the day of treatment that failed to ovulate in response to PGF2a was higher in ewes first treated early (0.8 + O.2/ewe) compared to late (0.3 + O.2/ewe) in the cycle (P < 0.05). The proportion of detected luteal structures relative to the number of ovulations was lower in ewes first treated early compared to late in the cycle (60 and 86%, respectively; P < 0.05). Disruption of ovulatory follicle dynarnics and normal luteogenesis, and variability in the timing of ovulation after PGF2a treatments could all contribute to poor or variable fertility when prostaglandins are used for estrus synchronization. MenosThe purpose of this study was to evaluate the ovarian response of ewes to two treatments with PGF2a using transrectal ovarian ultrasonography and hormone measurements. Fifteen milligrams of PGF2a was given to six cyclic Western White Face (WWF) ewes early in the estrous cycle (Days 4 to 7) and to six late in the cycle (Days 10 to 12 after ovulation), and a second treatment was given 9 days after the first. Ultrasound scanning and blood sampling started 7 days prior to the first PGF2a treatment and ended 10 days (scanning) or 19 days (blood sampling) after the second PGF2a treatment, for both groups of ewes. Mean ovulation rate (2.6+0.7) did Dot differ significantly between the ewes first treated early or late in the cycle, or after the first or second treatments with PGF2a The time from treatment to ovulation was longer in ewes first treated early (4.0+0.3 days) compared to late (2.8 + 0.4 days) in the cycle (P < 0.05). Both the number of ovulations (range: 0-7) and the time from treatment to ovulation (range: 1-9 days) were highly variable. This variability appeared to be due to the extension of the life span of ovulating follicles that emerged prior to PGF2a administration and also ovulation of some follicles that emerged after treatment. When results for first and second treatments were pooled, the total number of follicles =5 mm in diameter on the day of treatment that failed to ovulate in response to PGF2a was higher in ewes first treated early (0.8 + O.2/ewe) compared ... Mostrar Tudo |
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Palavras-Chave: |
PGF2alpha; Ultra-som. |
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Thesagro: |
Corpo Lúteo; Endocrinologia; Ovelha; Ovino; Reprodução Animal. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02672naa a2200241 a 4500
001 1530727
005 2010-07-12
008 2002 bl uuuu u00u1 u #d
100 1 $aBARRET, D. M. W.
245 $aUltrasound and endocrine evaluation of the ovarian response to PGF2alpha given at different stages of the luteal phase in ewes.
260 $c2002
520 $aThe purpose of this study was to evaluate the ovarian response of ewes to two treatments with PGF2a using transrectal ovarian ultrasonography and hormone measurements. Fifteen milligrams of PGF2a was given to six cyclic Western White Face (WWF) ewes early in the estrous cycle (Days 4 to 7) and to six late in the cycle (Days 10 to 12 after ovulation), and a second treatment was given 9 days after the first. Ultrasound scanning and blood sampling started 7 days prior to the first PGF2a treatment and ended 10 days (scanning) or 19 days (blood sampling) after the second PGF2a treatment, for both groups of ewes. Mean ovulation rate (2.6+0.7) did Dot differ significantly between the ewes first treated early or late in the cycle, or after the first or second treatments with PGF2a The time from treatment to ovulation was longer in ewes first treated early (4.0+0.3 days) compared to late (2.8 + 0.4 days) in the cycle (P < 0.05). Both the number of ovulations (range: 0-7) and the time from treatment to ovulation (range: 1-9 days) were highly variable. This variability appeared to be due to the extension of the life span of ovulating follicles that emerged prior to PGF2a administration and also ovulation of some follicles that emerged after treatment. When results for first and second treatments were pooled, the total number of follicles =5 mm in diameter on the day of treatment that failed to ovulate in response to PGF2a was higher in ewes first treated early (0.8 + O.2/ewe) compared to late (0.3 + O.2/ewe) in the cycle (P < 0.05). The proportion of detected luteal structures relative to the number of ovulations was lower in ewes first treated early compared to late in the cycle (60 and 86%, respectively; P < 0.05). Disruption of ovulatory follicle dynarnics and normal luteogenesis, and variability in the timing of ovulation after PGF2a treatments could all contribute to poor or variable fertility when prostaglandins are used for estrus synchronization.
650 $aCorpo Lúteo
650 $aEndocrinologia
650 $aOvelha
650 $aOvino
650 $aReprodução Animal
653 $aPGF2alpha
653 $aUltra-som
700 1 $aBARTLEWSKI, P. M.
700 1 $aCOOK, S. J.
700 1 $aRAWLINGS, N. C.
773 $tTheriogenology$gv. 58, n. 7, p. 1409-1424, 2002.
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Embrapa Caprinos e Ovinos (CNPC) |
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