The Effect of the Intensity of Estrus Expression on the Follicular Diameter and Fertility of Nellore Cows Managed Under a Ftai Program

Ferraz, Priscila Assis; Loiola, Marcus Vinícius Galvão; Rodrigues, Alexandra Soares; Lima, Marcos Chalhoub Coelho; Bittencourt, Thereza Cristina Borio dos Santos Calmon de; Filho, Antônio de Lisboa Ribeiro

doi:10.1590/1089-6891v18e-37643

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…Indeed, there is a positive correlation between pre ovulatory follicle diameter and serum estradiol levels and estrus expression (Perry et al, 2014), because the larger the follicle diameter, the higher the estradiol concentrations and the higher the expression of estrus and the best uterine environment for the establishment of the conceptus (Bridges et al, 2013). Similarly, Ferraz et al, (2017) reported that in Nelore cows the expression of estrus is directly related to the diameter of the ovulatory follicle.…”

Section: Discussionmentioning

confidence: 96%

GnRH Administration in the Synchronization of Receptors Cows for Fixed-Time Embryo Transfer

Messias

Cavalieri

Andreazzi

et al. 2022

JAS

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The bovine production chain in Brazil is highlighted worldwide; however, researchers are seeking to improve production even further by evaluating the use of reproductive biotechnologies, such as the transfer of embryos at a fixed time. The aim of this study was to analyze the expression of estrus associated or not with the use of gonadotropin releasing hormone (GnRH), on the diameter of the dominant follicle, diameter of the corpus luteum, utilization rate and conception rate of receptors cows. The experiment was carried out in southern Brazil and 400 receptors cows were used, distributed in a 2x2 factorial scheme, considering estrus expression and GnRH administration. All receptors were synchronized and, on Day 10, their ovaries were evaluated and, based on estrus expression, they were distributed into 2 subgroups: with and without GnRH application. On Day 18, they had their ovaries evaluated and they were inovulated, and on Day 41, the pregnancy diagnosis was made. The expression of estrus increased the diameter of the dominant follicle and corpus luteum and the utilization rate of the recipient cows; however, it did not improve the conception rate. The administration of GnRH, with or without the expression of estrus, did not affect any of the studied variables.

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Section: Discussionmentioning

confidence: 96%

GnRH Administration in the Synchronization of Receptors Cows for Fixed-Time Embryo Transfer

Messias

Cavalieri

Andreazzi

et al. 2022

JAS

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“…No presente estudo houve uma associação entre as dimensões foliculares e a expressão do estro, corroborando aos achados de algumas pesquisas que indicaram uma relação entre o estro antes da IATF e o maior diâmetro do folículo ovulatório [36][37][38]44,45]. De forma semelhante, Ferraz et al [21] desenvolveram trabalhos com objetivo de avaliar a associação entre a intensidade de expressão do estro de fêmeas bovinas submetidas a IATF e o diâmetro do folículo ovulatório, constatando diferença entre os animais que expressaram estro e os que não expressaram estro, obtendo média de 12,61 ± 3,34 mm e 10,30 ± 2,98 mm, respectivamente. Em pesquisas similares, Madureira et al [30] averiguaram que fêmeas bovinas com expressão de estro divergiram estatisticamente quanto ao diâmetro do folículo ovulatório em comparação as fêmeas sem expressão de estro, certificando-se, então, que maiores folículos proporcionaram uma maior expressão de estro.…”

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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“…Pada sapi perah, faktor-faktor yang berpotensi atau berpengaruh terhadap kejadian RB adalah defisiensi nutrisi, umur ternak, deteksi estrus yang tidak tepat, disfungsi endokrin, dan abnormalitas lingkungan uterus dan oviduk serta endometritis (39). Faktor-faktor tersebut sering muncul secara bersamaan sehingga sulit untuk mengkarakterisasi penyebab utama kejadian RB (Ferraz et al, 2017).…”

Section: Pembahasanunclassified

Pemodelan Matematik untuk Menentukan Faktor-faktor Penyebab Repeat Breeding pada Sapi Aceh

et al. 2023

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Penelitian ini bertujuan membuat pemodelan untuk diagnosis repeat breeding (RB) pada sapi aceh berdasarkan intensitas estrus, profil hormonal, profil biokimia darah, dan jumlah infeksi bakteri pada saluran uterus. Hewan yang digunakan pada penelitian ini adalah 16 ekor sapi aceh yang terdiri atas 7 ekor sapi aceh fertil dan 9 ekor sapi aceh RB, yang berumur 3-8 tahun dengan skor kondisi tubuh (BCS) 3-4. Seluruh sapi aceh fertil dan RB dilakukan sinkronisasi estrus menggunakan hormon PGF2α dengan pola penyuntikan ganda dengan interval 11 hari. Setelah penyuntikan PGF2α, intensitas estrus diamati 3 kali sehari yakni pada pukul 08.00, 12.00, dan 16.00 WIB, masing-masing pengamatan selama 20 menit. Koleksi serum dilakukan pada pagi hari (jam 07.00-09.00 WIB). Koleksi serum dilakukan untuk pemeriksaan kadar hormon estradiol dan progesteron menggunakan teknik enzyme linked immunosorbent assay (ELISA). Selain itu, sampel darah juga digunakan untuk pemeriksaan profil biokimia darah. Koleksi sampel bakteri dilakukan dengan metode swab uterus. Hasil pemodelan diagnosis RB pada sapi aceh diperoleh model matematis regresi linear sebagai berikut : Y= a + bX1 + bX2 .............+ bX11S/C = -5.28 + 1,27X1 - 0,69X2 - 0,99X3 - 0,23X4 + 2,28X5 – 0,53X6 + 0,71X7 - 0,29X8 + 0,09X9 + 3,04X10 Berdasarkan hasil dari pemodelan diagnosis RB pada sapi aceh menunjukkan bahwa penyebab utama RB pada sapi aceh adalah infeksi bakteri pada uterus yang kemungkinan mengakibatkan sapi tersebut mengalami stres yang ditandai dengan tingginya kadar glukosa dalam darah. Selain itu, RB pada sapi aceh juga dipengaruhi oleh ketidakseimbangan nutrisi dan hormonal yang mengakibatkan intensitas estrus menjadi rendah.

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The Effect of the Intensity of Estrus Expression on the Follicular Diameter and Fertility of Nellore Cows Managed Under a Ftai Program

Cited by 8 publications

References 22 publications

GnRH Administration in the Synchronization of Receptors Cows for Fixed-Time Embryo Transfer

GnRH Administration in the Synchronization of Receptors Cows for Fixed-Time Embryo Transfer

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

Pemodelan Matematik untuk Menentukan Faktor-faktor Penyebab Repeat Breeding pada Sapi Aceh

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