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Sincroniza？？o de estro em cabras da ra？a Saanen com esponja intravaginal e CIDR-G？
Maffili, V.V.;Torres, C.A.A.;Fonseca, J.F.;Moraes, E.A.;Pontes, R.A.M.;
Arquivo Brasileiro de Medicina Veterinária e Zootecnia , 2005, DOI: 10.1590/S0102-09352005000500004
Abstract: two short synchronization protocols associated to the estradiol cipionate (ec) for estrus duration were compared. twelve saanen breed goats were used (eight multiparous (m) and four nuliparous (n)) in two treatments. t1 (n=4m and 2n) animals received an insertion of sponge intravaginal (id) impregnated with 60mg of medroxyprogesterone acetate, and t2 (n=4m and 2n) animals received a cidr-g？. at the device (d=0) insertion time, 1mg of ce was injected in animals from both treatments. on day 5, the id was removed and the animals were observed for estrus detection every six hours. ultrasonographic exams were performed daily during the device treatment and at every six hours after the estrus detection, up to 12 hours after the ovulation. a follicular regression occurred at the emergence of a new wave in the fifth day of the permanence of the device cidr-g？ (day 0 = insertion device day). the estrus and pregnancy rates for goats were 5/6 and 1/5 for t1 and 6/6 and 2/6 for t2, respectively. intervals from removal of the device to the onset of estrus and from removal of the device to the end of estrus, and estrus duration, were 74.0±39.1h and 34.7±15.1h (p<0.05), 137.2±42.1h and 90.0±11.2h (p<0.05), and 63.2±24.9h and 55.3±17.2h (p>0.05), for t1 and t2, respectively. intervals from the onset of estrus to ovulation, from the end of estrus to ovulation, and from removal of the device to ovulation, were: 50.6±22.6h and 47.3±15.3h (p>0.05), -12.6±9.1h and -8.0±4.5h (p>0.05), and 124.6±34.1 and 82.0±12.4h (p<0.05), for t1 and t2, respectively. the ovulation number, diameter of ovulatory follicle (mm) and the ovulatory follicle growth rate were 1.2±0.45 and 2.33±1.03 (p<0.05), 8.4±2.4 and 6.2±0.1mm (p<0.05) and 2.4±0.97 and 2.9±1.67mm (p>0.05) for t1 and t2, respectively. the use of sponge and cidr-g？ associated with the ce was effective in inducing estrus. the complete absence of luteolysis at the moment of the device withdrawal, showed a great variation for the studied traits.
Effect of the anticipation of the of application of prostaglandin on the reproductive performance of beef cattle cows submitted to artificial insemination in fixed time Antecipa o da aplica o de prostaglandina, em programa de insemina o artificial em tempo fixo em vacas de corte
Carlos Santos Gottschall,Hélio Radke Bittencourt,Rodrigo Costa Mattos,Ricardo Macedo Gregory
Revista Brasileira de Saúde e Produ？？o Animal , 2009,
Abstract: The effect of the anticipation of the application of prostaglandin F2alfa (PGF2a) was evaluated for the use of fixed time artificial insemination (FTAI). Three hundred and six Aberdeen Angus cows, aged between 3 and 6 years old, with calves at side had been used. The animals were randomly distributed in 4 groups. All animals were synchronized through intravaginal device with progesterone for 8 days (CIDR ), estradiol and PGF2a. The treatments was designed in a factorial arrangement 2 x 2 (CIDR 1o x 2o use) and the day of the PGF2a application (6.5th x 8 th day). Seven days after the FTAI clean up bulls were joined until the ending of the breeding season. The conception rate to the FTAI and final pregnancy rate were evaluated. The anticipation of the application of the PGF2a (6.5th day) had significant effect (P<0.05) on the conception rate at the FTAI and final pregnancy rate, respectively of 60.9% and 89.1% when compared with the animals that had received PGF2a in the 8 th day, respectively of 49.3% and 76.7%. The 1th or 2th use of the intravaginal device had presented differences (P<0.05) in the conception rate (61.1% and 49.7%), however without effect in the final pregnancy (P>0.05), respectively of 82.6 and 83.4%. The anticipation of the application of the PGF2a increased the pregnancy rate significantly at the FTAI and the final pregnancy. The previous use of the CIDR affected the percentage of pregnancy at the FTAI, but it did not affect the final pregnancy. The cow’s age and the body condition score had not effect on the conception rate to the FTAI and the final pregnancy. Avaliou-se o efeito da antecipa o da aplica o da prostaglandina F2alfa (PGF2a) em programa de sincroniza o do estro com progesterona para o uso de insemina o artificial em tempo fixo (IATF). Foram utilizadas 306 vacas Aberdeen Angus, com cria ao pé e idade entre 3 e 6 anos. Os animais foram aleatoriamente distribuídos em 4 grupos sincronizados através de dispositivo intravaginal à base de progesterona por 8 dias (CIDR ), benzoato de estradiol e PGF2a, com arranjo fatorial de tratamentos 2 x 2 (CIDR 1o x 2o uso), e o dia da aplica o da PGF2a após a inser o do dispositivo intravaginal (6,5o x 8o dia). Sete dias após a IATF, touros foram soltos no rebanho até o término da esta o de acasalamento. Foram avaliadas as taxas de concep o à IATF e prenhez final. A antecipa o da aplica o da PGF2a (dia 6,5) teve efeito significativo sobre a taxa de concep o à IATF e prenhez final, respectivamente, de 60,9% e 89,1% em compara o aos animais que receberam PGF2a no 8o dia, respe
Respuesta estral y porcentaje de concepción en vacas Bos taurus-Bos indicus posparto, tratadas con la hormona bovina del crecimiento en un programa de inducción de la ovulación con progestágenos y eCG  [cached]
Linda Esther Velázquez Rosas,Carlos Fregoso Aguayo,Reyes López Ordaz,Joel Hernández Cerón
Veterinaria México , 2011,
Abstract: Se probó si la inyección de la somatotropina bovina (bST) al inicio de la inducción de la ovulación con progestágenos y eCG, y una segunda inyección en la inseminación, aumentan la respuesta estral y el porcentaje de concepción (PC) en vacas de carne posparto. Se utilizaron 174 vacas (Bos taurus-Bos indicus) de 60 a 100 días posparto, con cría y condición corporal de 2 a 2.5. Todas las hembras tuvieron un dispositivo intravaginal liberador de progesterona (CIDR) durante nueve días y al retirarlo se inyectó PGF2a. Las vacas se asignaron aleatoriamente a los siguientes tratamientos: eCG (n = 44) recibieron 400 UI de eCG al retirar el CIDR; bST (n = 44), recibieron 500 mg de bST al insertar el CIDR y 500 mg de bST en la inseminación; bST-eCG (n = 44), recibieron 500 mg de bST al insertar el CIDR y 400 UI de eCG al retirarlo, y 500 mg de bST en la inseminación; testigo (n = 42), sólo recibieron el CIDR. Se determinaron las concentraciones de progesterona antes de la inserción del CIDR. En siete vacas de cada grupo se determinaron las concentraciones séricas de IGF-I. Al inicio del experimento, 93% de las vacas estaba en anestro. La proporción de vacas que mostraron estro fue similar (P > 0.05) entre los tratamientos [eCG (36.4%); bST (45.4%); eCG-bST (52.2%); testigo (40.4%)]. El PC no difirió (P > 0.05) entre tratamientos [eCG (31.2%); bST (15%); eCG-bST (34.7%); testigo (40%)]. Las vacas tratadas con bST tuvieron mayores concentraciones de IGF-I. Se concluye que la inyección de bST al inicio de la inducción de la ovulación con progestágenos y eCG, y una segunda inyección en la inseminación no mejora la respuesta estral ni el porcentaje de concepción en vacas de carne posparto.
Efecto de la progesterona natural con o sin la adición de benzoato de estradiol sobre la presentación de celo, ovulación y gestación en animales tipo Bos indicus en el trópico mexicano Effect of natural progesterone with and without estradiol benzoate on the onset signs of oestrus, ovulation and pregnancy in Bos indicus cattle raised under mexican tropical conditions
G.S. DIAZ,C.S. GALINA,C.H. BASURTO,G.P. OCHOA
Archivos de medicina veterinaria , 2002,
Abstract: Se evaluó el efecto de un dispositivo intravaginal que contiene 1.9 g de progesterona y una cápsula de 10 mg de benzoato de estradiol (BE) (CIDR-B ), seguido o no de la aplicación intramuscular de BE, a las 24 horas de retirado el dispositivo, y se observó el porcentaje de estro, ovulación y gestación. Se utilizaron 122 vacas (experimento 1) y 30 novillas (experimento 2) tipo Bos indicus, que fueron asignadas aleatoriamente a tres grupos:Grupo ST: 20 vacas y 10 novillas sin tratamiento; Grupo CIDR-BE: 51 vacas y 10 novillas con un dispositivo por 10 ó 13 días respectivamente; y Grupo CIDRB+ E: 51 vacas y 10 novillas con un dispositivo por 10 ó 13 días, además de una inyección a las 24 horas de 1 ó 2 mg de BE. La detección de estros se realizó mediante la observación visual, haciéndose durante 96 horas después de retirar el CIDR-B, y posteriormente entre los 17 a 24 días posteriores a cada período de servicios, hasta concluir los 90 días que duró el empadre. Las que presentaron estro entre los días 0 a 47 fueron servidas por IA y las que lo presentaron del 48 al 90 por monta natural. Se tomaron muestras sanguíneas para medir niveles de progesterona para corroborar ovulación. El diagnóstico de gestación se realizó por palpación rectal y ultrasonografía. Las variables categóricas se analizaron mediante la prueba exacta de Fisher y las continuas mediante t de Student. Las condiciones reproductivas previas de las vacas se relacionaron con celos, ovulación y gestación con un modelo lineal logarítmico del Proc CATMOD, SAS. En ambos experimentos el grupo CIDR-B+E presentó un alto porcentaje de estro, 92.2 y 90.0% para vacas y novillas, siendo diferente (p<0.05) a los grupos CIDR-B-E (60.8 y 50.0%) y ST (35.0 y 0.0%). En cuanto a ovulación no hubo diferencias entre grupos (p0.05), aunque el grupo CIDR-B-E presentó mejores porcentajes, 51.6 y 60.0% contra 28.6 y 30.0% del grupo ST y 36.2 y 30.0% del grupo CIDRB+ E. La gestación global durante 90 días fue de 25.4% en el experimento 1 y 56.7% en el experimento 2 (p<0.05). A pesar de que las gestaciones obtenidas durante el período de 0-5 días de retirado el CIDR-B y los consecuentes cuatro ciclos estrales no mostraron diferencia estadística (p0.05), se observó que en todos los grupos ocurrieron en lapsos cercanos al tratamiento, ya que en los dos experimentos un 83.8% y un 82.3% correspondieron a los 0-5 días del retiro del CIDR-B y a los dos siguientes ciclos estrales. Del estudio se concluye que el estradiol (1 ó 2 mg) indujo la presencia de un mayor número de animales en celo; sin embargo, esto no se tradujo en u
Comparison the pregnancy rates between bovine recipients with cavitary or compact corpus luteum after cloprostenol or fixed time embryo transfer/ Compara o das taxas de prenhez entre receptoras com corpos lúteos cavitários ou compactos após protocolo de sincroniza o com cloprostenol ou transferência de embri es em tempo fixo  [cached]
Thales Ricardo Rigo Barreiros,Wanessa Blaschi,Edmilson Ant？nio Borsato,Heitor ênio Ludwig
Semina : Ciências Agrárias , 2006,
Abstract: The aim of this work was to evaluate pregnancy rates in bovine embryo recipients with compact and cavitary corpus luteum. Two hundred and three crossbred heifers were divided in two groups. In the first group (G-PGF, n=103), the animals received 500 mg de Cloprostenol IM (Sincrocio, Ouro fino, Brasil) after CL identification by ultrasonography. After that, heifers were detected for heat the next 72 hours. The animals from second group (G-P4, n=100) received an intravaginal progesterone device (CIDR, Pfizer, Brasil) and 2 mg estradiol benzoate (Estrogin, Farmavet, Brasil) IM, in random stages from estrus cycle. On the 8th day the devices were removed and the animals received 500 mg of Cloprostenol IM. After 24h all animals received 1 mg BE, IM. The CL was identified and evaluated at 10 and 17 days after the beginning of the treatment in G-PGF and G-P4, respectively. All the heifers with CL received IVP embryos. The pregnancy diagnosis was made by transrectal ultrasonography after 23 days. The results were nalyzed by Chi-square. There were no significant difference in number of heifers ready to embryo transfer in G-PGF and G-P4, respectively 72.8% (75/103) e 79% (79/100); (P>0.05)Twenty one percent (16/75) had cavitary CL in G-PGF and 22.7% (18/79) in G-P4 (P>0.05). Among all embryo recipients with a cavitary or compact CL there was no difference on pregnancy rates (41.1% 14/34 and 38.3% 46/120, respectively, P>0.05), regardless of protocol treatment. O objetivo deste experimento foi avaliar as taxas de prenhez em receptoras com corpo lúteo (CL) compacto ou cavitário, submetidas a protocolos com cloprostenol ou transferência em tempo fixo. Foram utilizadas 203 novilhas mesti as. No primeiro grupo (G-PGF, n=103), os animais com CL previamente detectados por ultra-sonografia transretal receberam 500 mg de Cloprostenol (Sincrocio, Ouro fino, Brasil), por via IM e permaneceram sob observa o de cio por 72 horas. No segundo grupo (G-P4, n=100), as novilhas receberam um dispositivo intravaginal de progesterona (CIDR, Pfizer, Brasil) simultaneamente à aplica o IM de 2 mg de benzoato de estradiol (BE); (Estrogin, Farmavet, Brasil). No oitavo dia, os dispositivos foram retirados e os animais receberam 500 mg de Cloprostenol (Sincrocio, Ouro fino, Brasil) por via IM. Após 24 horas, os animais receberam uma aplica o IM de 1 mg de BE. A avalia o ultra-sonográfica do CL foi realizada 10 dias e 17 dias após o início dos tratamentos, respectivamente para os grupos G-PGF e G-P4. Todas as receptoras com CL receberam embri es produzidos in vitro. O diagnóstico de gesta
Evaluation of a second uterine flushing on embryo recovery in Nelore cows / Avalia o de uma segunda lavagem uterina sobre a recuperac o de embri es em vacas Nelore  [cached]
Ant？nio Germano Wünsche Júnior,Thales Ricardo Rigo Barreiros,Gustavo de Arruda Bezerra,Jefferson Roela Azevedo
Semina : Ciências Agrárias , 2008,
Abstract: The objective of the present study was to evaluate the effect of a second uterine flushing on number of recovered embryos. Cyclic Nelore cows (n= ) were used as donors. Animals were kept under grazing conditions in a farm at Mamborê, Paraná state. Cows were submitted to two sessions of multiple ovulation 80 days apart. At a random stage of estrus cycle (Day 0) donors received an intravaginal device with 1.9 g of progesterone (CIDR; Pfizer; Brasil). Twenty four hours later (Day 1) cows were injected with 2.5 mg/ IM of Estradiol Benzoate (Estrogin, Farmavet, Brasil). Between Day 5 and Day 9, donors received decreasing doses of 250 UI of FSH (Pluset; Calier, Brasil). On Days 7 and cows received 25 mg/ IM of dinoprost (Lutalyse, Pfizer, Brasil) and progesterone implants were removed 12 hs later. Artificial insemination was performed 12 and 24 hours after estrus detection. The first embryo recovery was performed 7 days after AI with the Foley catheter positioned in the uterine body. A total of 1.000 mL of PBS (Embriocare, Cultilab, Brasil) was used in a closed system of uterine flushing, with a 70 μm filter. Recovered uterine fluid was evaluated under a stereomicroscope (SMZ 654, Nikon, Japan) and embryos were classified accord to IETS (1998). Twenty four hours later, the second uterine flushing was performed following the same procedure. Results were analyzed by t-Student test (p < 0,0 ). After 12 superovulation procedures, we obtained a total of 131 ova/embryo, being 91.4% (120/131) from the first uterine flushing and 8.4% (11/131) from the second one. We conclude that the second uterine flushing provided a small improvement on the number of recovered embryos. The feasibility of this method is restricted to special conditions, when the value of the embryos supports the additional work. O objetivo do presente experimento foi verificar a viabilidade de uma segunda lavagem uterina sobre a recupera o de embri es. Doadoras cíclicas da ra a Nelore (n= ) foram mantidas a pasto no município de Mamborê, Estado do Paraná. Os animais foram submetidos a tratamentos de superovula o com intervalo de 80 dias. Em um dia aleatório do ciclo estral (Dia 0) as doadoras receberam um dispositivo intravaginal contendo 1,9 g de progesterona (CIDR; Pfizer, Brasil). Vinte e quatro horas após (Dia 1) administrou-se , mg de benzoato de Estradiol (Estrogin; Farmavet, Brasil) por via intramuscular (IM). Entre Dia e Dia 9 realizou-se a superovula o com 0 UI de FSH IM em doses decrescentes (Pluset; Calier, Brasil). Administrou-se 25 mg de dinoprost IM (Lutalyse; Pfizer, Brasil) na manh
OVARIAN STEROIDS SECRETION, IN BEEF CROSSBREED EWES, AT DISTINCT MOMENTS OF YEAR, IN S O PAULO STATE SECRE O DE ESTERóIDES OVARIANOS, EM OVELHAS MESTI AS DE RA AS EXPLORADAS PARA CORTE, EM DISTINTOS MOMENTOS REPRODUTIVOS, NO ESTADO DE S O PAULO  [cached]
Maria Inês Lenz Souza,Luis Fernando Uribe-Velásquez,Eunice Oba,Ocilon Gomes de Sá Filho
Ciência Animal Brasileira , 2008,
Abstract: To define possible seasonality reprodutive in ovarian steroidogenesis at latitude 22°53’S and longitude 46°29’W, evaluated oestradiol (E2) and progesterone (P4) plasma concentrations, during the estrus cycle, at seasons considerate reproductive and non breeding, adult ewes were induced and/or synchronized with progesterone intra-vaginal dispenser (CIDR /13 days) and 500 IU of eCG (IM) injected upon device removal, at two periods throughout the year (experiment 1 – non breeding season, September and October; experiment 3 – breeding season, February and March), and natural estrus (experiment 2 – breeding season, January). In all experiments, blood samples were collected daily, in the morning, via jugular vein puncture during the estrous cycle to determine ovarian steroids plasma concentrations. The mean E2 (20.05 ± 11.12 pg/mL) and P4 (3.58 ± 2.38 ng/mL) concentrations evidenced differences between days of estrous cycle (p<0.0001), experiments (p<0.0001) and animals (p<0.0001). The mean oestradiol plasma levels have higher concentrations during synchronized estrus on September and October (non breeding season) than at the breeding season (February and March) or during the natural estrus period (January). These patterns of hormone concentrations revealed that follicular growth and development remained constant, compatible with ovulation, throughout reproductive cycle on different periods during either the synchronized or natural estrus. The mean progesterone plasma concentrations were higher during synchronized estrus at the breeding season, followed by the non breeding season, and lower during natural estrus period. In conclusion, normal steroidogenic function, follicular and luteal, was observed throughout the year, which revealed an ausence of seasonal influence within the related latitude, without anestrous season. KEY WORDS: Oestradiol, progesterone, reproductive seasonality, sheep. Para definir existência ou n o, na latitude 22°53’S e longitude 46°29’W, de estacionalidade reprodutiva sobre a esteroidogênese ovariana, avaliaram-se as concentra es plasmáticas de estradiol (E2) e progesterona (P4), no ciclo estral, nas esta es consideradas reprodutiva e n o-reprodutiva. Ovelhas adultas tiveram o estro induzido e/ou sincronizado, com dispositivo de progesterona intravaginal (CIDR /13 dias) e inje o de 500 UI de eCG (IM), no momento da retirada do dispositivo, em dois momentos do ano: Experimento 1 – esta o n o-reprodutiva, setembro e outubro; Experimento 3 – esta o reprodutiva, fevereiro e mar o, mais um estro natural; Experimento 2 – esta o reprodu
Evaluation of EAZI-Breed CIDR and FGA-30 Intravaginal Sponge as Estrus Synchronizing Agents in Pre-Partum Red Sokoto Does
B.O. Omontese,P.I. Rekwot,H.J. Makun,J.A. Obidi,J.S. Rwuaan,N.P. Chiezey
Veterinary Research , 2012, DOI: 10.3923/vr.2010.64.69
Abstract: The efficiency of EAZI-Breed CIDR and FGA-30 intravaginal sponges in synchronizing estrus was investigated in prepartum Red Sokoto does. About 19 randomly cycling pre-partum Red Sokoto does aged between 1.5-2 years and weighing between 12-14 kg were used for this study. They were randomly assigned into two groups, Group A (FGA, n = 10) and Group B (CIDR , n = 9) for 21 days. Natural mating was performed following progestagen withdrawal for animals detected to be on heat. Estrus response was 20 and 55.6% in groups A and B, respectively. The time to estrus onset following progestagen withdrawal for FGA and CIDR (Mean±S.D.) was 93.09±2.06 and 50.29±4.71 h; duration of induced estrus (0.08±0.05 and 39.99±6.05 h) while estrus cessation was (93.14±2.03 and 90.48±4.69 h) in group A and B, respectively. Interval between withdrawal of progestagen and onset of estrus was significantly (p<0.05) longer in FGA compared to CIDR. The duration of induced estrus period was significantly (p<0.05) longer in CIDR treatment. Retention rate was 100% (FGA) and 88.9% (CIDR) in group A and B, respectively. Drawstring breakage was observed in FGA sponges but absent in CIDR devices. Also, vaginal discharge rate was higher in FGA than CIDR groups. These results show that CIDR devices are more efficient in synchronizing estrus in prepartum Red Sokoto does. This is because CIDR provides higher estrus response rate, shorter time to estrus, longer duration of estrus, absence of drawstring breakage and better ease of application. Therefore, the use of CIDR is advocated.
Synchronization of Estrus Using FGA and CIDR Intravaginal Pessaries during the Transition Period in Awassi Ewes
A.K. Zonturlu,F. Aral,N. Ozyurtlu,U. Yavuzer
Journal of Animal and Veterinary Advances , 2012,
Abstract: The objective of this study was to investigate the efficiency of synchronization using different progesterone treatments during transition period from the non-breeding to the natural breeding season. Thirty-four non-lactating Awassi ewes were randomly assigned to two groups, treated with fluorogestone acetate (FGA group, n = 19) or controlled internal drug release devices (CIDR group, n = 15) for 12 days. After pessary and sponges removal, all ewes received an intramuscular injection of 300 IU. eCG. There was no significant differences between treatments for ewes in estrus (FGA: 84.2%, CIDR: 86.6%). The onset of estrus from progestagen treatments, FGA and CIDR groups was (mean S.D.) 45.00 1.00 and 36.00 3.40, respectively. Interval from the cessation of treatment to the onset of estrus was significantly (p<0.05) longer in FGA, compared to the CIDR. The duration of the induced estrus period did not differ significantly between in 2 treatment groups. Pregnacy rate did not differ (p>0.05) between FGA (52.63%) and CIDR (60.00%). As a result, Estrus synchronization with FGA and CIDR is found to be similar, although the onset time of estrus varies with the use of FGA or CIDR.
Synchronization of Estrus Using EAZI-Breed CIDR and FGA-30 Intravaginal Sponge in Pre-Partum Yankasa Ewes
B.O. Omontese,P.I. Rekwot,H.J. Makun,J.A. Obidi,J.S. Ruwaan,N.P. Chiezey
Research Journal of Animal Sciences , 2012, DOI: 10.3923/rjnasci.2010.53.57
Abstract: The efficiency of EAZI-Breed CIDR and FGA-30 intravaginal sponges in synchronizing estrus was investigated in prepartum Yankasa Ewes. About 20 randomly cycling pre-partum Yankasa ewes aged between 1.5-2 years and weighing between 13-15 kg was used for this study. They were randomly assigned into two groups, Group A (FGA, n = 10) and Group B (CIDR , n = 10) for 14 days. Natural mating by a fertile ram was performed following progestagen withdrawal for ewes detected to be on heat. Estrus response in Group A and B was 70 and 80%, respectively. The time to estrus onset following progestagen withdrawal for FGA-30 and CIDR (Mean±SEM) was 43.60±6.98 and 23.57±4.07 h, respectively. In Groups A and B, the duration of induced estrus was (46.65±3.08 and 53.90±5.87 h) while estrus cessation was (90.37±8.44 and 77.92±4.24 h) post withdrawal of the devices. The interval from withdrawal of progestagen to onset of estrus was (p<0.05) longer in FGA than in CIDR (43.60±6.98 vs. 23.57±4.07 h). However, the duration of induced estrus period was shorter in the FGA group than the CIDR group. Retention rate was lower in group A (60%) than B (90%). Drawstring breakage observed in FGA sponges was absent in CIDR devices (20% versus 0) while vaginal discharge rate was higher in group A. These results show that although FGA and CIDR devices are equally efficient in synchronizing estrus in prepartum Yankasa ewes, CIDR provides higher estrus response rate, shorter time to estrus, longer duration of estrus, higher retention rate and ease of application. Consequently, the use of CIDR is recommended.
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