Superovulation and embryo transfer in Bos indicus cattle

Baruselli, Pietro Sampaio; Filho, Manoel Francisco de Sá; Martins, C. M.; Nasser, L.F.; Nogueira, Marcelo Fábio Gouveia; Barros, C. M.; Bó, G. A.

doi:10.1016/j.theriogenology.2005.10.006

Cited by 129 publications

(103 citation statements)

References 31 publications

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“…This investment is geared towards solving problems such as inefficient estrus detection and poor fertility following AI. With the advent of pharmacological procedures to manipulate the estrous cycle [11] it is possible to a certain degree to eliminate the problem of estrus detection [12]. The economic feasibility of these procedures remain to be tested as the physiological state of the animals (anestric, with a calf suckling or poor nutrition) affects the capacity of producers to implement AI [13].…”

Section: Reproductionmentioning

confidence: 99%

Factors Affecting Technology Adoption in Small Community Farmers in Relation to Reproductive Events in Tropical Cattle Raised under Dual Purpose Systems

Galina¹,

Turnbull²,

Noguez-Ortiz³

2016

OJVM

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The impact of technology adoption among farmers in developing countries has been an issue difficult to measure and interpret. Hence, research to improve production has been centered in technology that possible is not adequate for this region. The present review aims to utilize subjects such as Genetics, Reproduction, Nutrition, Management and Animal Health as examples of research endeavors illustrating the scarcely bond existing between research and adoption of technology. A final section is an attempt to illustrate the possible reasons why the transfer of technology is failing to be of any consequence at least under the conditions of developing countries.

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Section: Reproductionmentioning

confidence: 99%

Factors Affecting Technology Adoption in Small Community Farmers in Relation to Reproductive Events in Tropical Cattle Raised under Dual Purpose Systems

Galina¹,

Turnbull²,

Noguez-Ortiz³

2016

OJVM

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“…The standard protocol that relies on superovulation after estrus detection still has some limitations, such as the need for heat detection, the need to start the superovulatory treatment at a specific time of the estrous cycle, the inability to schedule several collections on the same day, the inconsistency of results, and the fact that 20 to 30% of donors do not respond to the superovulatory treatment . This variability in superovulatory response remains one of the toughest challenges in ET programs in cattle (Mapletoft et al, 2002;Barros, 2004;Baruselli et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Effect of follicular wave synchronization on superovulatory response of Girolando embryo donors

Ferreira

Mello

Alves³

et al. 2014

R. Bras. Zootec.

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-The objective of this study was to evaluate the effect of the follicular wave synchronization method on the superovulatory response of Girolando embryo donors. Seven cows and five heifers were divided into three treatments according to the method of the follicular wave synchronization prior to superovulation. The donors were superovulated with eight FSH decreasing doses, adding 133 mg per animal. The superovulatory response was evaluated using an ultrasound device to quantify the number of corpora lutea. The number and quality of recovered structures were also evaluated. Animal category (cow or heifer) and genetic group influenced the superovulatory response, in which heifers showed a greater response (100% in all treatments) compared with cows, which showed 85.7%, 57.1% and 57.1% superovulatory response for standing estrus, GnRH and P4 + BE groups, respectively. The genetic group also showed influence on superovulatory response, in which the 3/8 animals had an average of 10.3 corpora lutea per donor compared with the 3/4 animals, which showed 4.9. The follicular wave synchronization treatments did not show differences in superovulatory response, recovered structures and viable structures. The treatment of follicular wave synchronization with GnRH or with P4 + BE can be used in Girolando donors with the same efficiency as the standing estrus group, and 3/8 Girolando heifers respond better to the superovulatory treatment.

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“…As mestiças têm atraso no retorno à ciclicidade (Ruas et al, 2002), portanto são recomendados protocolos de inseminação artificial em tempo fixo que utilizam implantes de P4 ou progestágenos. Com isso, aumenta-se a taxa de sincronização e, também se previne a ocorrência de ciclos curtos (Perry et al, 2004;Baruselli et al, 2006). Melhor taxa de prenhez, em vacas tratadas com cipionato de estradiol para induzir a ovulação em um protocolo de inseminação artificial em tempo fixo, é esperada quando mais vacas manifestam estro, aumentando assim a taxa de ovulação (Galvão et al, 2004).…”

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Inseminação artificial em tempo fixo e diagnóstico precoce de gestação em vacas leiteiras mestiças

Barbosa¹,

Jacomini²,

Diniz³

et al. 2011

R. Bras. Zootec.

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RESUMO -Avaliou-se, durante um ano, o desempenho reprodutivo de 94 vacas leiteiras mestiças Bos taurus × Bos indicus submetidas a um programa de reprodução assistida. Um protocolo de inseminação artificial em tempo fixo (IATF) foi executado por meio de dispositivo intravaginal contendo progesterona e das injeções de prostaglandina F2α e de cipionato de estradiol. Por meio de ultrassonografia, entre 7 e 14 dias após as inseminações ou montas controladas, realizou-se a detecção de corpo lúteo nos ovários a fim de determinar a taxa de ovulação e, no 28 o dia, fez-se o diagnóstico de gestação para cálculo da taxa de concepção. Respeitou-se um período mínimo de 34 dias após o parto antes do tratamento. Não houve influência do escore de condição corporal e da presença de corpo lúteo no início do protocolo, nem da reutilização do dispositivo intravaginal e da monta controlada ou inseminação artificial, sobre as taxas de ovulação, concepção e concepção das vacas ovuladas. As taxas de concepção e de concepção das vacas ovuladas foram afetadas negativamente pelo elevado número de dias pós-parto (DPP), ou dias em lactação e pela época quente do ano, primavera/verão. A resposta ao protocolo de inseminação artificial em tempo fixo baseado no uso de progesterona, PGF2α e cipionato de estradiol é prejudicada pelo aumento dos dias em lactação e pela época quente do ano. A condição corporal não afeta a resposta ao protocolo de inseminação artificial, desde que as vacas tratadas apresentem escore acima de 2,25 pontos.Palavras-chave: concepção, eficiência reprodutiva, ovulação, protocolo de sincronização Timed artificial insemination and early pregnancy diagnosis in crossbred dairy cowsABSTRACT -It was evaluated, during a period of one year, the reproductive performance of 94 Bos taurus × Bos indicus crossbred dairy cows submitted to an assisted reproduction program. A timed artificial insemination (TAI) protocol was carried out by using an intra-vaginal progesterone device containing progesterone and through injections with Prostaglandin F2α and estradiol cypionate. By using ultrasound, from 7 to 14 days after inseminations or controlled mattings, detection of corpus luteum in the ovaries was done to determine ovulation rate and, on the 28 th day, diagnosis of pregnancy was carried out for calculation of conception rate. Treatment only started after a 34-day post-partum minimal period. Body condition score, presence of corpus luteum in the beginning of the protocol, reutilization of intra-vaginal device and controlled mating or artificial insemination did not influence rates of ovulation, conception and conception of ovulated cows. Rates of conception and rates of conception of ovulated cows were negatively affected by the higher number of days post partum (DPP), or days in milk and by the warmer seasons of the year, spring/summer. Response to protocol of timed artificial insemination based on the use of progesterone, PGF2α and estradiol cypionate is negatively affected by lactation days and by the warm season of the year. Bod...

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Superovulation and embryo transfer in Bos indicus cattle

Cited by 129 publications

References 31 publications

Factors Affecting Technology Adoption in Small Community Farmers in Relation to Reproductive Events in Tropical Cattle Raised under Dual Purpose Systems

Factors Affecting Technology Adoption in Small Community Farmers in Relation to Reproductive Events in Tropical Cattle Raised under Dual Purpose Systems

Effect of follicular wave synchronization on superovulatory response of Girolando embryo donors

Inseminação artificial em tempo fixo e diagnóstico precoce de gestação em vacas leiteiras mestiças

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