Synchronization of Estrus in Cattle with an Oral Progestational Agent and an Injection of an Estrogen

Wiltbank, J. N.; Kasson, C. W.

doi:10.2527/jas1968.271113x

Cited by 53 publications

(28 citation statements)

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“…O estradiol foi inicialmente incorporado a esses tratamentos para promover a regressão luteínica (WILTBANK; KASSON, 1968). Entretanto, após a caracterização da PGF como a luteolisina natural em ruminantes e o desenvolvimento de análogos, esta tornou-se o agente luteolítico preferido (LAUDERDALE, 1972), apresentando respostas mais consistentes do que aquelas obtidas com o estradiol (LEMON, 1975).…”

Section: Tratamentos Com Progestágeno/progesterona E Estradiolunclassified

Sincronização da ovulação com dispositivo intravaginal de progesterona (CIDR®) em novilhas Bos indicus, Bos indicus x Bos taurus e Bos taurus

Carvalho¹

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, pelo incentivo e apoio mas, muito além disso, pelo exemplo: o seu inesgotável interesse pela reprodução animal e a sua infinita paixão pelo ensino e pela pesquisa constituem-se em um paradigma a ser seguido por toda a comunidade científica.Ao Prof. Dr. Cláudio Alvarenga de Oliveira, Chefe do Departamento e Coordenador do Programa de Pós-Graduação em Reprodução Animal, pela oportunidade e pela amizade.Ao Prof. Dr. José Antônio Visintin -sempre afável e disposto a contribuir -, pelos esclarecimentos e sugestões. indicus (9,5 ± 0,5mm) do que nas cruzadas (12,3 ± 0,4mm) e B. taurus (11,6 ± 0,5mm). O tratamento com PGF no D0 aumentou (P<0,05) o diâmetro do FD (11,9 ± 0,4 x 10,5 ± 0,5mm). A taxa de crescimento do FD foi menor (P<0,05) nas novilhas B. indicus (0,9 ± 0,1mm/dia) do que nas novilhas cruzadas (1,2 ± 0,1mm/dia) e B. taurus (1,1 ± 0,1mm/dia). A taxa de crescimento foi maior (P<0,05) nas novilhas tratadas com PGF no D0 (1,2 ± 0,1 x 0,9 ± 0,1mm/dia). A taxa de ovulação foi menor (P<0,05) nas novilhas B. indicus (39,1 %) do que nas novilhas cruzadas (84,0 %) e B. taurus (72,7 %). Novilhas tratadas com PGF no D0 apresentaram maior (P<0,05) taxa de ovulação (78,8 x 54,0 %). O intervalo entre a retirada do dispositivo de P 4 (D8) e a ovulação foi maior (P<0,05) nas novilhas B. indicus (78,0 ± 2,3h) do que nas novilhas B. taurus (73,5 ± 1,0h). A concentração sérica de P 4 durante o tratamento (D0 a D8) diferiu (P<0,05) entre as novilhas B. indicus (5,4 ± 0,4ng/ml), B. taurus (3,3 ± 0,2ng/ml) e cruzadas (4,3 ± 0,3ng/ml). A concentração de P 4 foi menor (P<0,05) nas novilhas tratadas com PGF no D0 (3,3 ± 0,2 x 5,2 ± 0,3ng/ml ABSTRACTThis study evaluated the effect of treatment with progesterone intravaginal device (CIDR  ) associated to estradiol benzoate (BE) and prostaglandin F 2∝ in the follicular dynamic of B. indicus (Nelore and Gir), B. taurus (Angus and BWH) and respectively cross-breed. Aiming to evaluate the effect of different plasmatic progesterone concentration (P 4 ) in the follicular dynamic (3 by 2 factorial design), a half of heifers in each genetic group received PGF at moment of device insertion (D0). The ultrasonography was performed from D0 to D8 (device withdrawal) every 24 hours, and from D9 to ovulation every 12 hours to evaluate the follicular growth. All heifers were bled on D0, on D3, on D6, on D8 and on D10 for determination of serum progesterone concentration. The maximum diameter of DF was lower (P<0.05) in B. indicus heifers (9.5 ± 0.5mm) than in cross-breed (12.3 ± 0.4mm) and in B. taurus (11.6 ± 0.5mm) heifers. The PGF treatment on D0 increased (P<0.05) the diameter of DF (11.9 ± 0.4 x 10.5 ± 0.5mm). The growth rate of DF was lower (P<0.05) in B. indicus heifers (0.9 ± 0.1mm/day) than in cross-breed (1.2 ± 0.1mm/day) and in B. taurus (1.1 ± 0.1mm) heifers. The growth rate was higher (P<0.05) in heifers that received PGF on D0 (1.2 ± 0.1 x 0.9 ± 0.1mm/day). The ovulation rate was lower (P<0.05) in B. indicus heifers (39.1%) than in cross-breed (84.0%) and in B. taurus (72.7%). Heife...

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Section: Tratamentos Com Progestágeno/progesterona E Estradiolunclassified

Sincronização da ovulação com dispositivo intravaginal de progesterona (CIDR®) em novilhas Bos indicus, Bos indicus x Bos taurus e Bos taurus

Carvalho¹

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“…Persistence of a DF is associated with an intermediate LH pulse frequency of one pulse every 2 hours (Savio et al, 1993;Stock and Fortune, 1993;Taylor et al, 1993). In order to overcome the low fertility associated with long-term progestagen treatments, the duration of treatment was shortened by use of oestrogen at the start of treatment to shorten CL life span (Wiltbank and Kasson, 1968;Roche, 1974). There was variability in the spread of onset of oestrus.…”

Section: Follicle Wave Synchrony and Pgf2amentioning

confidence: 99%

Hormonal Regulation of the Oestrous Cycle of Cattle

Roche

Austin

Ryan

et al. 1998

Reprod Domestic Animals

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“…Research in the early 1960s showed that P4 treatments of >14 days duration resulted in good synchrony of oestrus but low pregnancy rates (Macmillan and Peterson 1993). Subsequently, the treatment period was reduced to 9-12 days by administration of oestradiol as a luteolytic agent at the start of the progestagen treatment (Wiltbank and Kasson 1968;Roche 1974). While this procedure resulted in improved pregnancy rates, there was greater variability in the onset of oestrus compared with protocols that used longer periods of P4 exposure (Roche et al 1999).…”

Section: Introductionmentioning

confidence: 98%

A Bayesian meta-analysis of the effects of administering an intra-vaginal (CIDR) device in combination with other hormones on the reproductive performance of cycling, anoestrous and inseminated cows

Rabiee

Lean

Stevenson

2004

New Zealand Veterinary Journal

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The results of this meta-analysis showed that synchrony programmes using CIDR devices combined with other hormones reliably enhanced submission rates in lactating dairy cows. The relatively small number of trials with data suitable for analysis and the heterogeneity of results at the individual trial level limited our ability to confirm either a beneficial or deleterious effect of treatment on conception or pregnancy rates. Further randomised, controlled trials to evaluate the effectiveness of this form of reproductive therapy in commercial dairy farms are needed.

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Synchronization of Estrus in Cattle with an Oral Progestational Agent and an Injection of an Estrogen

Cited by 53 publications

References 0 publications

Sincronização da ovulação com dispositivo intravaginal de progesterona (CIDR®) em novilhas Bos indicus, Bos indicus x Bos taurus e Bos taurus

Sincronização da ovulação com dispositivo intravaginal de progesterona (CIDR®) em novilhas Bos indicus, Bos indicus x Bos taurus e Bos taurus

Hormonal Regulation of the Oestrous Cycle of Cattle

A Bayesian meta-analysis of the effects of administering an intra-vaginal (CIDR) device in combination with other hormones on the reproductive performance of cycling, anoestrous and inseminated cows

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