Impact of Equine Chorionic Gonadotropin Associated with Temporary Weaning, Estradiol Benzoate, or Estradiol Cypionate on Timed Artificial Insemination in Primiparous Bos Indicus Cows

Souza, Andre Luis Bastos; Segui, Marcio Saporski; Kozicki, Luiz Ernandes; Weiss, R R; Abreu, Ana Claudia Machinski Rangel de; Bertol, Melina Andreia Formighieri; Oliveira, Danilo Martins Amadori

doi:10.1590/1678-4324-2016150389

Cited by 8 publications

(7 citation statements)

References 22 publications

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“…In spite of optimizing the protocol over time, current studies report that the P/AI at the first TAI rarely exceed 65.0% and show significant variation (51.4%, 48.8%, and 62.7%; Oliveira et al, ; Sá Filho, Crespilho, Santos, Perry, & Baruselli, ; Sá Filho, Dias, Lamb, & Vasconcelos, ; Souza et al, ), respectively. More recently, researchers improved the traditional method of oestrous synchronization and ovulation and subsequent TAI to increase the pregnancy rate by performing resynchronization followed by TAI in animals that did not become pregnant after the first artificial insemination, with the aim of optimizing P/AI in the breeding season (Marques et al, ).…”

Section: Discussionmentioning

confidence: 78%

“…In spite of optimizing the protocol over time, current studies report that the P/AI at the first TAI rarely exceed 65.0% and show F I G U R E 1 Diagram of the administered protocols in GRN and GRU groups focused on the synchronization (SO) and resynchronization (RES) of ovulation in Bos taurus indicus cows. EB on d0: estradiol benzoate, 2 mg IM; EB on d32: 1 mg (Bioestrogen, Biogenesis Bagó, Curitiba, Brazil); PGF: D-Cloprostenol, 500 μg IM (Croniben, Biogenesis Bagó); eCG: equine chorionic gonadotropin, 300 IU IM (Ecegon, Biogenesis Bagó); EC: estradiol cypionate, 0.5 mg IM (Croni-cip, Biogenesis Bagó); GRN: intravaginal progesterone device (new) 1 g (Cronipres, Biogenesis Bagó); GRU: intravaginal progesterone device (used) 1 g (Cronipres Mono dose, Biogenesis Bagó); US: ultrasonography; PD: pregnancy diagnosis significant variation (51.4%, 48.8%, and 62.7%; Oliveira et al, 2016;Sá Filho, Crespilho, Santos, Perry, & Baruselli, 2010;Sá Filho, Dias, Lamb, & Vasconcelos, 2010;Souza et al, 2016), respectively. More recently, researchers improved the traditional method of oestrous synchronization and ovulation and subsequent TAI to increase the pregnancy rate by performing resynchronization followed by TAI in animals that did not become pregnant after the first artificial insemination, with the aim of optimizing P/AI in the breeding season (Marques et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

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Resynchronization of ovulation with new and reused intravaginal progesterone‐releasing devices without previous pregnancy diagnosis in Bos taurus indicus cows subjected to timed‐artificial insemination

Oliveira

Kozicki

Gaievski

et al. 2019

Reprod Domestic Animals

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Contents The study aimed to evaluate pregnancy per artificial insemination (P/AI) of cows subjected to synchronization and resynchronization in ovulation protocols using intravaginal progesterone‐releasing insert (P4) before pregnancy diagnosis (PD) and the relationship of PR with the diameter of preovulatory follicles (ØPOF) before TAI. Cows (n = 378) were distributed into two groups: a resynchronization group with new devices (GRN; n = 185) and resynchronization group with used devices (GRU; n = 193). On Day 0, both groups received a new P4 and estradiol benzoate (EB). On D8, P4 removal + D‐cloprostenol + eCG + estradiol cypionate (EC) was done. On d10, TAI was conducted. On d32, cows were resynchronized and divided into two groups, GRN (n = 185) and GRU (n = 193). The GRN group received a new P4 + EB, and the GRU group received a used P4 + EB. On d40, the P4 was removed + PD. The non‐pregnant cows received D‐cloprostenol + eCG + EC. US was done again on d42 to determine ØPOF before the second TAI. The P/AI of the GRN and GRU groups after synchronization were 56.2% and 57.0% (p = 0.87), respectively, and those after resynchronization were 58.0% and 37.3% (p < 0.008), respectively. The P/AI of the GRN and GRU groups observed after TAI (synchronization + resynchronization) were 81.6% and 73.1%, respectively (p = 0.047). No difference (p = 0.067) in ØPOF between the pregnant and non‐pregnant cows in the GRN was found, whereas the GRU group showed a significant difference (p = 0.003). Resynchronization protocols optimized the P/AI in both groups. New intravaginal devices resulted in greater P/AI and P/AI accumulation in resynchronization as compared with the GRU; the ØPOF was related with P/AI.

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Section: Discussionmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 99%

Resynchronization of ovulation with new and reused intravaginal progesterone‐releasing devices without previous pregnancy diagnosis in Bos taurus indicus cows subjected to timed‐artificial insemination

Oliveira

Kozicki

Gaievski

et al. 2019

Reprod Domestic Animals

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“…Tortorella et al (2013) in cross beef cows, applying 400 UI of eCG two days prior removal of the progesterone intravaginal device in cows in anoestrus obtained an increase in the diameter of the dominant follicle, total luteal volume, concentration of serum progesterone and conception rate. In Nellore, the eCG + Temporary Weaning protocol was efficient in primiparous cows (Campos et al 2013;Souza et al 2016).…”

Section: Discussionmentioning

confidence: 99%

Effect of equine chorionic gonadotropin on pregnancy rate in Brown Swiss cows under high altitude conditions

Mínguez

Velarde

2020

Journal of Applied Animal Research

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The objective of the present study was to evaluate the administration of Equine Chorionic Gonadotropin (eCG) in a protocol of fixed-time artificial insemination (FTAI) to increase the pregnancy rate in cows subjected to high altitude conditions. These conditions could generate a syndrome of right-sided heart failure and, as consequence, animals trend to have a low body score condition with a decrease in fertility. The research was conducted with 84 lactating cows (Brown Swiss) randomly into two groups with a body condition score between 2.5 and 3.5, allocated at 3100 m above sea level. In the FTAI protocol, 400 IU of eCG was administered (n = 42) or not (n = 42) at progesterone intravaginal device removal. A significant improvement in pregnancy rate was found with eCG treatment in those cows with low body condition score (BCS of 2.5, scale 1-5), while no effect was found in those cows with higher BCS (i.e. 3.0 and 3.5). In conclusion, the addition of 400 IU of eCG in an FTAI in cows under high altitude conditions and low body conditions can improve the fertility.

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“…Although AI has emerged as one of the most important reproductive biotechnologies, it has some limitations, which are mainly related to the fact that beef cattle producers have several herds over extensive ranges, where detecting estrus and managing animals in estrus for insemination is challenging. In recent decades, conventional AI has been significantly improved by inseminating animals at a predetermined time without the observation of estrus (6,7) , giving rise to FTAI.…”

Section: Introductionmentioning

confidence: 99%

Estrus response patches, timing for artificial insemination, and GnRH protocol in Split Timed AI beef cattle

Demeterco,

Walker,

Kozicki

et al. 2023

Ciênc. anim. bras.

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An estrous-detection patch was used to determine the optimum timing for STAI and the necessity of GnRH at STAI on a 7-day CO-Synch+CIDR protocol. Crossbred beef cows (n=216) were stratified into the following treatment groups: CTRL=TAI (n=67) at 72 h post CIDR removal, or TRT=STAI (n=149) at 72 or 84 h post CIDR removal. All females received GnRH (100 mcg) plus a CIDR on d0, PGF2α, CIDR removal, and an Estrotect estrous-detector patch on d7. At 72 h post-CIDR removal, a patch score was assigned (PS1<50% removed; PS2>50% removed) to all females. Cows in the CTRL group were administered a second GnRH (100 mcg) at 72 h TAI. Cows in the TRT group with PS2 were not administered GnRH. At 84 h, the remaining TRT group cows were given a second PS; cows with PS1 received a GnRH (100 mcg), and cows with PS2 were not administered. Results: The TAI pregnancy rates were similar (P=0.81) between the CTRL (45.6%) and TRT (44.8%) groups. Pregnancy rates tended to be higher (P=0.07) for cows with PS2 (50.3%) than for those with PS1 (29.4%). However, by extending TAI to 84 h in unresponsive cows, 82.0% of TRT cows did not receive a second injection of GnRH at TAI. It was concluded that the estrous detector patches reduced the percentage of cows that required GnRH at TAI without compromising pregnancy rates. The estrous detector patches significantly reduced the number of cows that received a second GnRH injection at TAI.

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Impact of Equine Chorionic Gonadotropin Associated with Temporary Weaning, Estradiol Benzoate, or Estradiol Cypionate on Timed Artificial Insemination in Primiparous Bos Indicus Cows

Cited by 8 publications

References 22 publications

Resynchronization of ovulation with new and reused intravaginal progesterone‐releasing devices without previous pregnancy diagnosis in Bos taurus indicus cows subjected to timed‐artificial insemination

Resynchronization of ovulation with new and reused intravaginal progesterone‐releasing devices without previous pregnancy diagnosis in Bos taurus indicus cows subjected to timed‐artificial insemination

Effect of equine chorionic gonadotropin on pregnancy rate in Brown Swiss cows under high altitude conditions

Estrus response patches, timing for artificial insemination, and GnRH protocol in Split Timed AI beef cattle

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