Ovarian follicular dynamics of Nelore (Bos indicus) cows subjected to a fixed-time artificial insemination protocol with injectable progesterone

Morotti, Fábio; Campos, Jefferson Tadeu; Oliveira, Eder Jorge de; Seneda, Marcelo Marcondes

doi:10.5433/1679-0359.2013v34n6supl2p3859

Cited by 9 publications

(10 citation statements)

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“…Some reproductive parameters remain critical for the fertility of females synchronized with P4 injectable, such as the ovulation and pregnancy rates, but it is valid to highlight important aspects of this pharmacological strategy for reproductive management in cattle. In the present and other studies ( Morotti et al ., 2013a ; Morotti et al ., 2013b ; Campos et al ., 2016a ), greater convenience in managing animal synchronization was observed using P4 injectable. Such benefits are due to the convenience of a parenteral application in addition to the hygienic and sanitary advantages of injectable solution compared to intravaginal devices.…”

Section: Discussionsupporting

confidence: 79%

“…To assist reproductive biotechnology, several pharmacological strategies have been proposed ( Sales et al ., 2012 ; Campos et al ., 2013 ; Barreiros et al ., 2014 ; Torres et al ., 2014 ; Marques et al ., 2015 ; Pellegrino et al ., 2016 ) and progesterone (P4) has been the main exogenous hormonal basis for estrus synchronization in cattle; treatment can be performed through intravaginal devices ( Macmillan et al ., 1991 ; Macmillan and Peterson, 1993 ), ear implants ( Baruselli et al ., 2004 ; Sa Filho et al ., 2011), oral formulations ( Fike et al ., 1999 ) or injectable sources ( Morotti et al ., 2013a ; Morotti et al ., 2013b ; Campos et al ., 2016a ).…”

Section: Introductionmentioning

confidence: 99%

“…However, several positive aspects of injectable P4 have been encouraging new experiments. For example, injectable P4 has been related to low cost of handling, easy management of animals, hygienic benefits and no discard of devices ( Morotti et al ., 2013a ; Morotti et al ., 2013b ; Campos et al ., 2016a ; Campos et al ., 2016b ).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Injectable progesterone in timed artificial insemination programs in beef cows

Morotti¹,

Campos²,

Lunardelli³

et al. 2017

Anim Reprod

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The aims of this study were I) to compare the follicular diameter, corpus luteum diameter and serum progesterone (P4) concentrations in cows treated with conventional protocol vs. injectable P4 protocol; II) to determine the serum P4 profile in ovariectomized heifers; and III) to compare pregnancy rate between protocols. In experiment I, multiparous cows received a protocol for ovulation synchronization with an intravaginal P4 device (n = 38; device + EB day 0; device removal + PGF2α + eCG + EC day 8) or injectable P4 (n = 38; injection + EB day 0; PGF2α + eCG + EC day 8). In experiment II, ovariectomized heifers (n = 8) were treated with injectable P4 and blood samples were collected to determine the serum P4 profile. In experiment III, multiparous cows were timed AI with two different P4 approaches, intravaginal P4 device (n = 48) or injectable P4 (n = 47). In the first experiment, cows treated with P4 device had higher (P < 0.05) diameter of dominant follicle after ovulation induction (11.6 ± 1.8 vs.10.3 ± 1.8 mm) and ovulation rate (97%, 37/38 vs. 47.3%, 18/38) than cows treated with injectable P4. But, the follicular growth daily was higher (P < 0.05) in cows treated with injectable P4 than intravaginal device (1.3 ± 0.4 vs. 1.0 ± 0.3 mm/day, respectively). In experiment II, the P4 concentration peak occurred within 48 hours (6.54 ng/mL) and decreased after 96 hours (P < 0.05) after P4 injection. In experiment III, cows with P4 device had higher (P < 0.05) pregnancy rate than the injectable P4 group (60.4 vs. 34.0%, respectively). These results demonstrate that although the intravaginal P4 devices showed a higher pregnancy rate, a protocol with injectable P4 represents an easier method and a promising alternative for TAI in cattle.

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Section: Discussionsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Injectable progesterone in timed artificial insemination programs in beef cows

Morotti¹,

Campos²,

Lunardelli³

et al. 2017

Anim Reprod

Self Cite

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“…Diversos autores já atestaram que os protocolos de IATF baseados na administração de estradiol e P4 são altamente eficientes em vacas Bos indicus (SÁ FILHO et al, 2011b;SALES et al, 2012). Entretanto, os estudos e possíveis avanços no sentido de minimizar o serviço e reduzir os custos ainda são necessários para que se continue progredindo na biotecnologia reprodutiva (MOROTTI et al, 2013). Neste sentido, a aplicação de uma quantidade menor de P4 injetável associado ao implante de quarto uso aparece como alternativa para reduzir os custos da IATF em propriedades de bovinocultura, já que o implante iria ser descartado, mesmo contendo uma pequena quantidade de P4.…”

Section: Resultsunclassified

Implantes de progesterona de quarto uso associados à progesterona injetável em programa de IATF em Bovinos de corte

Oliveira

Silva

2019

BJD

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“…Despite these relative advantages, another study conducted by the same research group showed that cows synchronized with injectable P4 showed a lower pregnancy rate (27.0 %) than did those synchronized with an intravaginal device (45.5 %) (MOROTTI et al, 2013b). Although a few studies have been conducted using injectable P4, more knowledge of this strategy's pharmacological adjustments, changes in the management of animal, and/or synchronization protocols could improve fertility in cows when synchronized this way.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of pregnancy rates of Bos indicus cows subjected to different synchronization ovulation protocols using injectable progesterone or an intravaginal device

Campos

Morotti

Costa

et al. 2016

SCA

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This study evaluated the pregnancy rate in Nelore cows (Bos indicus) that were subjected to fixedtime artificial insemination (FTAI) using different protocols consisting of injectable progesterone (P4) or an intravaginal device (impregnated with P4). Multiparous cows 72-84 months in age, 30-45 days postpartum, were selected on the basis of the absence of a corpus luteum (CL) and follicles <8 mm after transrectal palpation and ultrasound examinations. On a random day of the estrus cycle (D0), the selected animals (n = 135) were randomly assigned to one of three experimental groups (n = 45 each). Group I (injectable P4/FTAI 36 hours) received 250 mg of injectable P4 and 2 mg EB on D0; on D7, they received 500 µg of cloprostenol; on D8, 300 IU of eCG and 1 mg of EB were administered; and finally, FTAI was performed 36 hours after the application of EB. Group II (injectable P4/FTAI 48 hours) received the same protocol as Group I, except that the FTAI was performed 48 hours after ovulation induction. The animals of Group III (Control/CIDR) received a conventional protocol for FTAI using an intravaginal device (D0: P4 and 2 mg EB; D8: device removal, 500 µg cloprostenol, 300 IU eCG, 1 mg EB; and FTAI performed 48 hours after removal of the device). The results showed that cows synchronized with the conventional protocol for FTAI (Control/CIDR) had a higher pregnancy rate (60 %, 27/45) than those synchronized with an injectable P4/FTAI 36 hours (33.33 %; 15/45, P = 0.010). However, the group receiving injectable P4 group/FTAI 48 hours had a similar pregnancy rate (48.9 %; 22/45; P = 0.290) when compared to both the group receiving the conventional protocol and that receiving injectable P4/FTAI 36 hours (P = 0.134). Although the injectable P4 may affect pregnancy rate with the FTAI performed in 36 hours, we found similar pregnancy rates from cows inseminated 48 hours after induction ovulation, considering injectable or intravaginal P4. Therefore, we suggest that injectable P4 represents an alternative source of progesterone for synchronization of cattle for FTAI. Key words: FTAI. Nelore. Injectable progesterone. Pregnancy rate. ResumoEste estudo avaliou a taxa de prenhez de vacas Nelore (Bos indicus) submetidas a diferentes protocolos de IATF a base de progesterona (P4) injetável ou dispositivo intravaginal impregnado com P4. Vacas multíparas entre 72 e 84 meses de idade, com 30 a 45 dias pós-parto foram previamente selecionadas com base na ausência de corpo lúteo (CL) e folículos < 8 mm após palpação e exame ultrassonográfico transretal. Em um dia aleatório do ciclo estral (D0), os animais selecionados (N = 135) foram aleatoriamente distribuídos em um dos três grupos experimentais (n = 45 / grupo). O grupo I (P4 injetável/IATF 36 horas) recebeu 250 mg de P4 injetável e 2 mg BE no D0. No D7 aplicou-se 500 µg de Cloprostenol. No D8 300 UI de eCG e 1 mg de BE foram administrados, sendo que a IATF foi realizada 36 horas após a aplicação do BE. O grupo II (P4 injetável/IATF 48 horas) recebeu o mesmo protocolo, excet...

show abstract

Ovarian follicular dynamics of Nelore (Bos indicus) cows subjected to a fixed-time artificial insemination protocol with injectable progesterone

Cited by 9 publications

References 12 publications

Injectable progesterone in timed artificial insemination programs in beef cows

Injectable progesterone in timed artificial insemination programs in beef cows

Implantes de progesterona de quarto uso associados à progesterona injetável em programa de IATF em Bovinos de corte

Evaluation of pregnancy rates of Bos indicus cows subjected to different synchronization ovulation protocols using injectable progesterone or an intravaginal device

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