Estrous response after a short progesterone priming in seasonally anestrous goats

Rubianes, E.; Castro, T. de; Kmaid, S.

doi:10.1016/s0093-691x(98)90709-9

Cited by 34 publications

(13 citation statements)

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“…The P4 released by the device during the treatments elevates serum P4 level rapidly which causes regression of the persistent follicles effectively, inhibits gonadotropin release from the anterior pituitary, allows blocking oestrous behaviour and ovulation until the time of withdrawal. After CIDR withdrawal, P4 level dropped rapidly, with no accumulative effect observed, which stimulate GnRH release from the hypothalamus, which coincides with the preovulatory increase in LH and FSH which resulted in the initiation of typical waves of ovarian follicular growth from which ovulation occurred (Diskin et al, ; Hashim & Sembiring, ; Husein & Ababneh, ; Rubianes, Castro, & Kmaid, ; Wheaton et al, ). At the time of insemination, the E2 level was significantly ( p < 0.05) higher in the CIDR0 and CIDR6 groups than other groups.…”

Section: Discussionmentioning

confidence: 99%

“…In the present result, the high heat detection rate which observed in the CIDR0 and CIDR6 groups may be caused by exposure to sufficient P4 levels, which allows the blockade of LH and primes the brain to enable the maximum response to estradiol, resulting in oestrous behaviour (Turzillo, Clapper, Moss, & Nett, 1998 observed, which stimulate GnRH release from the hypothalamus, which coincides with the preovulatory increase in LH and FSH which resulted in the initiation of typical waves of ovarian follicular growth from which ovulation occurred (Diskin et al, 2002;Hashim & Sembiring, 2013;Husein & Ababneh, 2008;Rubianes, Castro, & Kmaid, 1998;Wheaton et al, 1993). At the time of insemination, the E2 level was significantly (p < 0.05) higher in the CIDR0 and CIDR6 groups than other groups.…”

Section: Discussionmentioning

confidence: 99%

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Efficacy of using previously used controlled internal drug release (CIDR) insert on the reproductive performance, hormone profiles and economic measures of sheep

Swelum

Saadeldin

Moumen

et al. 2018

Reprod Domestic Animals

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This study was conducted using 120 multiparous Awassi ewes during the breeding season to compare the effects of using previously used controlled internal drug release (CIDR) on the hormone profiles, reproductive performance and economic measures of ewes. Ewes were randomized to receive one of five previously used CIDR (previously used for 6, 12, 18, 24 or 30 days) or the new CIDR as a control for 6 days (CIDR6, CIDR12, CIDR18, CIDR24, CIDR30, and CIDR0 [control], respectively). Blood samples were collected on four occasions, at the time of CIDR insertion, after 3 days of insertion, and at the time of withdrawal and insemination. Serum estradiol (E2) and progesterone (P4) concentrations were measured. Timed insemination was performed 48 hr post-CIDR withdrawal. Pregnancy was diagnosed by ultrasonography 23 days after insemination and confirmed on day 35. The heat detection rate was significantly (p < 0.05) higher in the CIDR0 and CIDR6 groups than in the CIDR18 and CIDR30 groups. The total pregnancy rate and fecundity were significantly (p < 0.05) higher in the CIDR6 group than in other groups. P4 level was significantly (p < 0.05) higher in the CIDR0 group than in the CIDR30 group at the time of removal. At each time point, the E2 level was significantly (p < 0.05) higher in the CIDR6 group than at the other groups. The total variable cost, total cost, return and net profit were higher in the CIDR6 and CIDR0 groups than in the other groups. In conclusion, although previously used CIDRs are efficient at synchronizing oestrus in ewes, the duration of previously usage significantly affected the reproductive parameters and economic profit. CIDRs previously used for 6 days and new CIDRs provided the highest fertility and fecundity rates, besides return and net profit. Economically, it is not advisable to use CIDRs that previously used for 12 days or more.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Efficacy of using previously used controlled internal drug release (CIDR) insert on the reproductive performance, hormone profiles and economic measures of sheep

Swelum

Saadeldin

Moumen

et al. 2018

Reprod Domestic Animals

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“…A sincronização por progestágenos baseia-se na manutenção do dispositivo de liberação lenta por tempo que pode variar de cinco a 20 dias (Fonseca, 2002). Para indução ou sincronização do estro, recomenda-se que o dispositivo permaneça na vagina da cabra por 14 a 17 dias, embora bons resultados tenham sido obtidos utilizando-se o produto por períodos de 18 a 21 dias (Greyling e van der Nest, 2000) ou mesmo cinco, sete ou 12 dias (Rubianes et al, 1998). A utilização de dispositivos por período prolongado (acima de 14 dias) baseia-se no fato de que, independentemente da fase do ciclo estral de sua inserção, haverá tempo suficiente para ocorrer a regressão natural do corpo lúteo, sem que haja necessidade do uso de agentes luteolíticos.…”

Section: Introductionunclassified

Sincronização de estro em cabras da raça Saanen com esponja intravaginal e CIDR-G®

Maffili

Torres

Fonseca

et al. 2005

Arq. Bras. Med. Vet. Zootec.

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RESUMOCompararam-se dois protocolos de curta duração, associados à aplicação de cipionato de estradiol (CE) para sincronização de estro, utilizando-se 12 cabras da raça Saanen, oito multíparas (M) e quatro nulíparas (N), distribuídas em dois tratamentos (T). O T1 (n = 4M e 2N) correspondeu à inserção de esponja impregnada com 60mg de acetato de medroxiprogesterona e o T2 (n= 4M e 2N), à inserção de CIDR-G ® . No dia zero (d=0), dia da inserção dos dispositivos intravaginais, foi aplicado nos animais dos dois tratamentos 1mg de CE. Os dispositivos intravaginais permaneceram por cinco dias quando se iniciou a detecção de estro, realizada a cada seis horas. Exames ultra-sonográficos foram feitos diariamente, durante a permanência do dispositivo, e a cada seis horas após a detecção do estro, até 12 horas após a ovulação. Houve regressão folicular com a emergência de uma nova onda no quinto dia da permanência do dispositivo CIDR-G ® . As taxas de manifestação de estro e de gestação foram de 5/6 e 1/5 para T1 e de 6/6 e 2/6 para T2, respectivamente. Os intervalos da retirada do dispositivo ao início do estro e da retirada do dispositivo ao fim do estro e a duração do estro foram: 74,0±39,1 e 34,7±15,1 horas (P<0,05), 137,2±42,1 e 90,0±11,2 horas (P<0,05) e 63,2±24,9 e 55,3±17,2 horas (P>0,05), para T1 e T2, respectivamente. Em T1 e T2, os intervalos do início do estro à ovulação foram 50,6±22,6 e 47,3±15,3 horas (P>0,05), do final do estro à ovulação, -12,6±9,1 e -8,0±4,5 horas (P>0,05) e da retirada do dispositivo à ovulação, 124,6±34,1 e 82,0±12,4 horas (P<0,05), respectivamente. O número de ovulações, o diâmetro do folículo ovulatório e a taxa de crescimento dos folículos ovulatórios foram: 1,2±0,45 e 2,33±1,03 (P<0,05), 8,4±2,4 e 6,2±0,1mm (P<0,05) e 2,4±0,97 e 2,9±1,67mm/dia (P>0,05), respectivamente, para T1 e T2. A utilização da esponja e do CIDR-G ® associada ao CE foi efetiva em induzir o estro. A ausência de luteólise completa no momento da retirada do dispositivo foi responsável pela grande variação nas características estudadas. Recomenda-se que os dispositivos liberadores de progesterona e seus análogos sintéticos sejam deixados por, no mínimo, sete dias, quando associados ao CE.Palavras-chave: caprino, cipionato de estradiol, dispositivos, intravaginal, progesterona, ultra-som ABSTRACT

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“…Thereafter, the levels are even too low to restrict LH secretion at the end of the treatment (Kojima et al 1992). The same has been described for goats (Rubianes et al 1998). If LH is not suppressed, this may lead to inadequate follicular development, with persistent large follicles having deficient stereidogenesis (Johnson et al 1996;Vin˜oles et al 1999;Flynn et al 2000).…”

Section: Discussionmentioning

confidence: 66%

Preovulatory Follicle Development in Goats Following Oestrous Synchronization with Progestagens or Prostaglandins

Fernandez-Moro¹,

Veiga-López

Ariznavarreta³

et al. 2007

Reprod Domestic Animals

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The study reports on differences in the dynamics of growth and functionality of preovulatory follicles in response to oestrous synchronization, either by the administration of two doses of prostaglandin or by an intravaginal progestagen sponge, in goats. The progestagen-treated group (n = 8) showed more follicles of preovulatory size (> or =5.5 mm) than the cloprostenol group (n = 8) during the follicular phase (4.5 +/- 0.6 vs 1.9 +/- 0.2, p < 0.01). The diameters of the largest follicles (LF1, LF2 and LF3) were also larger in the progestagen group (LF1, 7.8 +/- 0.3 vs 7.0 +/- 0.2 mm, p < 0.05; LF2, 6.7 +/- 0.2 vs 5.6 +/- 0.2 mm, p < 0.01; LF3, 5.5 +/- 0.3 vs 4.2 +/- 0.2 mm, p < 0.01). The study of the preovulatory follicles showed that 27.2% (3/11) of the follicles were in the static phase in the cloprostenol group, whilst 71.4% (10/14) were static in progestagen group (p < 0.05). Higher plasma oestradiol levels were recorded in the progestagen-treated goats during the 48 h prior to cloprostenol injection or progestagen withdrawal (4.2 +/- 0.4 vs 3.0 +/- 0.2 pg/ml, p < 0.05). In conclusion, goats with oestrus synchronized by progestagen showed a higher number of preovulatory-sized follicles, but a decreased oestradiol secretion when compared with does with oestrus synchronized by using prostaglandin analogues. These would support the development of alternative protocols for assisted reproduction.

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Estrous response after a short progesterone priming in seasonally anestrous goats

Cited by 34 publications

References 0 publications

Efficacy of using previously used controlled internal drug release (CIDR) insert on the reproductive performance, hormone profiles and economic measures of sheep

Efficacy of using previously used controlled internal drug release (CIDR) insert on the reproductive performance, hormone profiles and economic measures of sheep

Sincronização de estro em cabras da raça Saanen com esponja intravaginal e CIDR-G®

Preovulatory Follicle Development in Goats Following Oestrous Synchronization with Progestagens or Prostaglandins

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