Avaliação morfofuncional do corpo lúteo para diagnóstico precoce de gestação 20 dias após IATF em vacas mestiças leiteiras

Silva, Mariana A.A.; Rodrigues, Alexandra Soares; Brandão, Tiago Oliveira; Maggitti, Luiz Di Paolo; Carôso, Bia S.S.; Chalhoub, Marcos; Bittencourt, Rodrigo Freitas; Filho, Antônio de Lisboa Ribeiro

doi:10.1590/1678-5150-pvb-5413

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…In non-pregnant women, this cavity tends to disappear with the estrus cycle. Silva et al (2018) studied the relationship between ovulatory follicle diameter, CL area, and pregnancy rate in beef cows submitted to FTAI and obtained a luteal body with a mean area of 2.04±0,22cm² in the group of pregnant females, similar to the rate observed in this study; these values are similar than those obtained in the present study. Silveira et al (2012) used Nelore cows synchronized for FTAI and reported pregnancy rates of 53%; in addition, Tortorella et al (2013) used 400 IU of eCG in the FTAI protocol for beef cows to evaluate the effect on gestation rate, among other variables, and obtained a 52% pregnancy rate for a group of treated females.…”

Section: Resultssupporting

confidence: 88%

Application of low dose of equine chorionic gonadotropin at acupoint Hou Hai for fixed-time artificial insemination in beef cows

Araújo

Mendes

Biscarde

et al. 2019

SCA

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This study evaluated the efficiency application of low dose of equine chorionic gonadotropin (eCG) using Hou Hai acupoint for fixed-term artificial insemination (FTAI) in beef cows. Seventy cows received intravaginal devices with progesterone, and 3 mg of estradiol benzoate on day zero (D0) of FTAI. On D9, the devices were removed, and 150 ?g of prostaglandin F2? was applied; the animals were then randomly distributed to three treatment groups: T1 (n = 23), 300 IU of eCG intramuscularly (IM); T2 (n = 23), 90 IU of eCG at acupoint Hou Hai; and T3 (n = 25), 90 IU of eCG at false acupoint IM. On D10, the animals received 1 mg of gonadotropin-releasing hormone IM, and FTAI was performed, 52 h after the devices were removed. The quantitative variables with normal distribution were assessed using analysis of variance at 5% probability. For variables that did not show normal distribution, Kruskal-Wallis test at 5% probability was used. No significant difference was noted among the groups (P > 0.05) for the interval between device withdrawal at ovulation (58.2 ± 12.2 h), diameter of the largest follicle on D9 (9.9 ± 2.2 mm), diameters of the ovulatory follicle (12.2 ± 3.0 mm) and the second largest follicle (6.7 ± 2.1 mm), follicular growth rate (0.8 ± 0.3 mm/d), ovulation rate (82%), corpus luteum size (2.32 ± 0.35 cm2), and pregnancy rate (58.67%). The protocol cost per animal was US$ 10.67 (T1) and US$ 8.50 (T2 and T3). The use of 90 IU of eCG applied at Hou Hai acupoint or at false acupoint caused satisfactory synchronization of estrus in beef cows. In addition, this procedure was cost-effective.

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Section: Resultssupporting

confidence: 88%

Application of low dose of equine chorionic gonadotropin at acupoint Hou Hai for fixed-time artificial insemination in beef cows

Araújo

Mendes

Biscarde

et al. 2019

SCA

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“…Em estudos similares, observou-se a influência do comportamento de estro sobre as dimensões luteais e os níveis séricos de progesterona no período pós-ovulatório, sugerindo, assim, a existência de uma correlação entre expressão do estro e parâmetros morfofuncionais luteais [34,35,43]. Deste modo, a mensuração da vascularização, nesta estrutura ovariana, pode fornecer importantes informações sobre a função luteal e o índice de fertilidade em fêmeas bovinas [8,12,28,48].…”

Section: Discussionunclassified

Effect of the Estrus Expression on Follicular and Luteal Morphofunctional Characteristics and Fertility in Bos indicus females Synchronized for FTAI

Menezes

Batista

Sousa

et al. 2021

Acta Scientiae. Vet.

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Background: Recent studies have been conducted with the aim of improving the fertility rates in the FTAI programs in beef females. The observation of the estrus expression constitutes an important indicator of fertility in zebu females. Therefore, this work has as an objective to evaluate the impact of the estrus expression on the follicular, luteal and fertility morphofunctional characteristics of Nelore females synchronized for FTAI.Materials, Methods & Results: Sixty five lactating female Nelore (Bos taurus indicus) were used. On a random day, denominated day 0 (D0), the 65 Nelore females received a progesterone-releasing device associated to the application of 2.0 mg of estradiol benzoate intramuscularly (IM). On D9, the progesterone-releasing intravaginal devices were removed and was administered 500 μg of cloprostenol sodium IM; 0.6 mg of estradiol cypionate IM and 300 UI of Equine Chorionic Gonadotropin IM. At this point, the animals were marked with a marking stick for the determination of the estrus expression. On D11 of the synchronization protocol, the animals were characterized in two groups: without estrus expression (WO/ ESTRUS) and with estrus expression (W/ ESTRUS). The evaluation of the follicle diameter (FOLD), of the follicle wall area (FOLA), of the follicle wall vascularization (FOLV) and the percentage of vascularization in the area of the preovulatory follicle wall (%FOLV) were conducted on D11 using B-mode ultrasonography and color Doppler and then the artificial inseminations were performed. The evaluation of the corpus luteum diameter (CLD), the total area of the corpus luteum (CLA), of the area of vascularization of the corpus luteum (CLV), of the percentage of vascularization of the in the area of the corpus luteum (% CLV) and the collection of blood for the evaluation of the serum levels of progesterone were carried out on D24. The analysis of the serum progesterone concentration were performed by the chemiluminescence method using the Access immunoassay systems Progesterone, with a sensitivity of 0.1 ng/mL. The diagnosis of gestation was carried out by transrectal ultrasonography on D45. The animals of the WITH ESTRUS group presented superior FOLD, FOLA, FOV (P < 0.05) averages to those presented by the cows of the WITHOUT ESTRUS group. In relation to the luteal characteristics, in the WITH ESTRUS group the cows exhibited averages for CLD, CLA, CLV and P4 significantly higher than those of the WITHOUT ESTRUS group. However, the bovines of the WITH ESTRUS group presented a % CLV similar to the presented by the females of the WITHOUT ESTRUS group. As for the fertility rates, there was difference between the experimental groups WITH ESTRUS and WITHOUT ESTRUS.Discussion: The present work demonstrated the impact of the estrus expression on the follicular morphological parameters, therefore in accordance with other studies. These authors show a relation between the estrus expression and levels of estradiol, which is directly related to the sperm transport in the female reproductive tract, oocyte maturation and fertilization directly affecting the fertility of females submitted to the FTAI program. Similarly, there was an interrelation between the estrus expression and the luteal morphological parameters, corroborating with the findings of some researches, where were verified higher luteal morphological parameters associated to higher conception rates in cows that demonstrated estrus behavior in the FTAI. Therefore, the estrus detection can be used as a tool to direct matings in synchronization protocols, promoting the identification of the animals with a higher probability of conception, owing to better follicular and luteal hemodynamic conditions.

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Follicular and luteal morphofunctionality of dairy cows supplemented with calcium salts of fatty acids in AIFT programs

et al. 2021

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Avaliação morfofuncional do corpo lúteo para diagnóstico precoce de gestação 20 dias após IATF em vacas mestiças leiteiras

Cited by 3 publications

References 17 publications

Application of low dose of equine chorionic gonadotropin at acupoint Hou Hai for fixed-time artificial insemination in beef cows

Application of low dose of equine chorionic gonadotropin at acupoint Hou Hai for fixed-time artificial insemination in beef cows

Effect of the Estrus Expression on Follicular and Luteal Morphofunctional Characteristics and Fertility in Bos indicus females Synchronized for FTAI

Follicular and luteal morphofunctionality of dairy cows supplemented with calcium salts of fatty acids in AIFT programs

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