Comparison of Estradiol Cypionate and Estradiol Benzoate Effects on Ovaric Activity, Estrus and Ovulation on Anestrus Bos indicus Cows

Peralta-Torres, Jorge Alonso; Aké-López, Jesús Ricardo; Centurión-Castro, Fernando; Magaña-Monforte, Juan Gabriel

doi:10.3923/javaa.2010.466.470

Cited by 7 publications

(8 citation statements)

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“…A statistical comparison of pregnancy rates obtained in this study within experimental groups reveals that while no significant difference occurred among them, it is remarkable to see the percentage of 53.3% (8/15) obtained in the treatment 2 was applied to nursing cows. However, pregnancy rates of the present study are found among the factors mentioned by other researchers (20,21), which indicates that these pregnancy rates are quite varied, especially in IATF programs which range from 33% to 68%.…”

Section: Discussioncontrasting

confidence: 56%

“…With regard to management, the disadvantage of this protocol is that it requires two PGF2α injections with an interval of 8 to 12 hours, which are necessary to induce complete regression of the corpus luteum induced by initial GnRH. This is caused by a shorter interval between the first GnRH and luteolysis induction that in standard 7-day Ovsynch protocol (23) The main advantage of hormonal treatments is postpartum ovarian reactivation, as has been acknowledged by other authors (20,21). However, it offers low pregnancy percentages when applying FTAI protocols.…”

Section: Discussionmentioning

confidence: 98%

“…In cows exposed to treatment 2, estrus incidence was concentrated around 76 hours after the extraction of the P4 insert. This result with Brahman cattle differed from the one reported by Bridges et al ( 13 Como se ha reconocido por otros autores (20,21), la principal ventaja de los tratamientos hormonales fue la reactivación ovárica posparto, aunque son bajos porcentajes de preñez al aplicar los protocolos de IATF esta biotecnología contribuye a mejorar parámetros reproductivos y productivos de la ganadería bovina, fortaleciendo programas de mejoramiento genético. Por último se requiere analizar las concentraciones plasmáticas de progesterona y otras hormonas asociadas a fertilidad presentes en diferentes momentos del protocolo de sincronización y efectuar un seguimiento de la dinámica folicular y al diámetro del folículo dominante que puedan permitir mejorar los porcentajes de preñez.…”

Section: Discussionunclassified

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Comparación de dos protocolos de inseminación artificial a tiempo fijo en vacas Brahman

et al. 2018

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Objetivo. Comparar dos protocolos de inseminación artificial a tiempo fijo (IATF) sobre el porcentaje de preñez en vacas Brahman. Materiales y métodos. Se seleccionaron 60 vacas entre 90 y 360 días posparto y asignadas aleatoriamente en dos grupos. El tratamiento 1 (T1; n=30) consistió en la aplicación el día 0 de un dispositivo intravaginal (DIV) que contenía 0.5 g de progesterona y 2.0 mg de benzoato de estradiol im. El día 8 se retiró el DIV y se aplicaron 0.150 mg de PgF2α, im y 300 UI de eCG, im y 0.5 mg de cipionato de estradiol, im. El día 10 se realizó la IATF a las 48 – 50 h posterior al retiro del DIV. El tratamiento 2 (T2; n= 30) consistió en la inserción del DIV el día 0 y 0.01 mg GnRH, im. El día 5 se retiró el DIV y se aplicaron dos dosis de 0.150 mg de PgF2α, a las 0 y 12 horas. El día 8 se realizó la IATF a las 72 h posterior al retiro del DIV y 0.01 mg de GnRH, im. La IATF se realizó con un semen de fertilidad comprobada. Resultados. El diagnóstico de preñez se realizó a los 45 días luego de la IATF por palpación rectal. El T2 y T1 presentaron porcentajes de preñez de (46.7%; 14/30) y (33.3%; 10%30), respectivamente. Conclusiones. Se justifica la aplicación del tratamiento 2 en función de los resultados y la salud pública.

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Section: Discussioncontrasting

confidence: 56%

Section: Discussionmentioning

confidence: 98%

Section: Discussionunclassified

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Comparación de dos protocolos de inseminación artificial a tiempo fijo en vacas Brahman

et al. 2018

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“…Time from intravaginal device removal to estrus is important for establishing the best moment for FTAI (Ayres et al, 2008;Kasimanickam et al, 2015). Ovulation occurs 30 and 31 h after cows estrous manifestation when EC or EB is used (Peralta-Torres et al, 2010a). Therefore, when more prolonged is the beginning of estrous, after DIB withdrawal, the time for AI will be misaligned.…”

Section: Discussionmentioning

confidence: 99%

Effects of reproductive tract development and hormonal treatment on estrous synchronization in heifers

et al. 2020

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Evaluation of the reproductive tract development (RTD) is a criterion rarely used when heifers are included in estrous synchronization programs. The objective of the present study was to determine the effect of RTD (mature and immature) and hormonal treatment (EC and EB) on estrous expression rate and pregnancy rate in Bos indicus heifers under tropical conditions. RTD was evaluated with an ultrasound and classified as mature (n=99) or immature (n=101). Heifers received an intravaginal device (DIB®; day 0), 2 mg of estradiol benzoate (EB) and 250 µg of cloprostenol (PGF2α). The DIB was removed on day 7 post insertion, and 250 µg of PGF2α was applied and heifers were divided into two groups: One group of heifers received 0.5 mg of estradiol cypionate (EC group), and on day 8, a second group of heifers received 1 mg of estradiol benzoate (EB group). Estrus was detected by visual observation, and all heifers were inseminated at a fixed-time (FTAI). Fifteen days after insemination, bulls were introduced to the treatment groups. Data were analyzed using general modeling and binary logistic regression procedures. The percentage of estrus was similar for both mature and immature heifers (P>0.05), however, the heifers treated with EB had 17% animals in estrus, than the heifers that received EC (P <0.05). The pregnancy rate after FTAI (74.8%) and total pregnancy (FTAI + natural mating = 91.9%) was greater for the group of heifers with a mature reproductive tract (P<0.05). The hormone treatment had not effect (P>0.05) on the pregnancy rate. In conclusion, the heifers with mature reproductive tracts had the highest pregnancy rate after artificial insemination and total pregnancy. Hormonal treatment did not influence the pregnancy rate.

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“…Para as inseminações empregou-se sêmen criopreservado comercializado de um único touro da raça Nelore. (Reis et al, 2004, Martins et al, 2005, Crepaldi, 2009, Peralta-Torres et al, 2010. Dois animais do tratamento BE não ovularam e um deles, embora tenha apresentado um folículo de 11,5 mm de diâmetro, este folículo começou a entrar em atresia a partir do dia 11 do protocolo, provavelmente, por não ter alcançado capacidade ovulatória.…”

Section: Experimentounclassified

Eficiência Do Cipionato De Estradiol E Do Benzoato De Estradiol Em Protocolos De Indução Da Ovulação Sobre a Dinâmica Ovariana E Taxa De Concepção De Fêmeas Nelore Inseminadas Em Diferentes Momentos

Andrade

Ferraz

Rodrigues

et al. 2012

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RESUMO:Objetivou-se avaliar a dinâmica ovariana e a taxa de concepção de fêmeas Nelore submetidas à IATF utilizando o benzoato ou o cipionato de estradiol como indutores da ovulação e inseminadas nos turnos da manhã ou da tarde. Para tanto, 296 animais receberam um dispositivo intravaginal de progesterona e a aplicação de 2,0 mg benzoato de estradiol em um dia aleatório, denominado D0. No D8 houve a remoção dos implantes, a administração de 500 µg de Cloprostenol e 300 UI de gonodotrofina coriônica equina. Neste momento, metade dos animais recebeu 1,0 mg de cipionato de estradiol, e a outra metade 1,0 mg de benzoato de estradiol no dia posterior (D9), constituindo os tratamentos CE e BE, respectivamente. No experimento 1, 38 animais (19 de cada tratamento) tiveram a dinâmica ovariana acompanhada por ultrassonografia. No experimento 2, 258 animais distribuídos nos tratamentos (CE e BE) foram estratificados para que as inseminações ocorressem pelo turno da manhã (M) ou da tarde (T) do D10, constituindo os grupos CE-M (n = 65), BE-M (n = 65), CE-T (n = 63) e BE-T (n = 65). Não foi encontrada diferença entre os tratamentos para as variáveis: diâmetro do folículo ovulatório, momento das ovulações, taxa de ovulação e diâmetro do corpo lúteo, entretanto, os animais do grupo CE apresentaram maior taxa de crescimento folicular (CE: 0,48 mm/dia; BE: 0,29 mm/dia). Não houve diferença na taxa de concepção entre os grupos CE-M (52,3%), BE-M (41,5%), CE-T (41,3%) e BE-T (49,2%). O emprego do cipionato em substituição ao benzoato proporciona uma redução no número de manejos sem comprometer a dinâmica ovariana e os índices de concepção. Adicionalmente, a extensão no intervalo para realização das inseminações revela-se como uma alternativa aos modelos de gestão no uso desta biotecnologia. Palavras-chave: corpo lúteo; dinâmica folicular; IATF; ultrassonografia EFFICIENCY OF ESTRADIOL CYPIONATE AND ESTRADIOL BENZOATE IN OVULATION INDUCER PROTOCOLS ON OVARIAN DYNAMICS AND CONCEPTION RATE OF NELORE FEMALES INSEMINATED AT DIFFERENT TIMES ABSTRACT:We aim to evaluate the ovarian dynamics and conception rates of Nelore females subjected to TAI using benzoate or estradiol cypionate as ovulation inducers and inseminated that morning or afternoon. For this, 296 animals received an intravaginal progesterone device and 2,0 mg of estradiol benzoate applied on a random stage of the oestrous cycle, named D0. On D8, the devices were removed and 500 µg of Cloprostenol and 300 IU of equine chorionic gonadotropin were administered. At that time, half of the animals received 1,0 mg of estradiol cypionate, and the other half received 1,0 mg of estradiol benzoate on the following day (D9), establishing the EC and EB treatments respectively. On experiment 1, 38 animals (19 for each treatment) had the ovarian dynamics accompanied by ultrasonography. On experiment 2, 258 animals were randomly distributed according to treatments (EC and EB) in order for the inseminations to occur in the morning (M) or in the afternoon (T) of D10, establishing thus groups ...

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Comparison of Estradiol Cypionate and Estradiol Benzoate Effects on Ovaric Activity, Estrus and Ovulation on Anestrus Bos indicus Cows

Cited by 7 publications

References 1 publication

Comparación de dos protocolos de inseminación artificial a tiempo fijo en vacas Brahman

Comparación de dos protocolos de inseminación artificial a tiempo fijo en vacas Brahman

Effects of reproductive tract development and hormonal treatment on estrous synchronization in heifers

Eficiência Do Cipionato De Estradiol E Do Benzoato De Estradiol Em Protocolos De Indução Da Ovulação Sobre a Dinâmica Ovariana E Taxa De Concepção De Fêmeas Nelore Inseminadas Em Diferentes Momentos

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