Follicular Dynamics and Pregnancy Rate in Nellore Heifers Submitted to Fixed-Time Artificial Insemination Protocols (FTAI)

Silva, Filipe Prudente da; Neves, Kedson Alessandri Lobo; Correa, Francisco R. A.; Silva, Lílian K. X.; Batista, Helder R.; Silva, Welligton Conceição da; Caruso, Nohora Mercado; Minervino, Antônio Humberto Hamad

doi:10.3390/vetsci9080377

Cited by 2 publications

(2 citation statements)

References 26 publications

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“…It is known that the process of follicle atresia, and follicle growth and ovulation, is a complex biological process, and follicle atresia is characterized by tissue remodeling (Silva et al 2022). It is assumed that one of the enzymes of tissue remodeling is gelatinase, which plays an important role in this process.…”

Section: Introductionmentioning

confidence: 99%

Results of Ultrasound Studies of the Growth Dynamics of Dominant, Subdominant Follicles and Determination of Estradiol Concentration in the Preovulatory Period in Cows

2023

Int J Vet Sci

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The mechanism of natural selection of the dominant follicle and hormonal regulation of this process in cattle is still insufficiently studied. The purpose of the study was to study the dynamics of the growth of subdominant and dominant follicles in Holstein cows and optimize the technique of scanning the ovaries during the estrus cycle, measuring the parameters of follicle growth, analyzing the results of sonograms and determining the concentration of estradiol in the pre-ovulatory period. To study the growth dynamics of subdominant and dominant follicles, the method of scanning the ovaries of cows during the estrous cycle using PU2200Vet devices and the Mindray Z5 Vet ultrasound scanner equipped with a convex endorectal sensor with a frequency of 5.0-7.0MHz was used. Two or three waves of dominant follicle growth with a duration of 4 to 12 days were detected in the studied animals. The maximum area of dominant follicles ranged from 191.18 to 243.18mm 2 . It is proved that the growth of dominant follicles in cows during the spontaneous estrous cycle is accompanied by an increase in the subdominant follicle population, per dominant follicle corresponds from 13.66 to 21.0 subdominant follicle. According to the results of the study, the growth rate of dominant follicle was higher compared to the growth of subdominant follicle, the growth rate of dominant follicle was from 0.9 to 4.43mm/day, this indicator for subdominant follicle was from 0.26 to 1.40mm/day. In the pre-ovulatory period, cows have a decrease in the amount of estradiol in the blood serum. The use of Doppler ultrasound scanning of the blood vessels of the corpus luteum allows determining the functional activity of the corpus luteum of the estrous cycle.

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Section: Introductionmentioning

confidence: 99%

Results of Ultrasound Studies of the Growth Dynamics of Dominant, Subdominant Follicles and Determination of Estradiol Concentration in the Preovulatory Period in Cows

2023

Int J Vet Sci

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“…Regarding reproductive management, fixed-time artificial insemination (FTAI) has been increasingly used (10,11,12,13,14) . This biotechnique aims to synchronize the ovulation of bovine females after the administration of drugs on predetermined days, so that it is possible to synchronize a batch of cows and inseminate them on the same day, without the need for estrus observation (15,16,17,18) .…”

Section: Introductionmentioning

confidence: 99%

¿Existe correlação entre o escore de condição corporal e a taxa de prenhez de vacas nelores submetidas a IATF na Amazônia Oriental?

Oliveira

Silva²,

Maia³

et al. 2022

Ces. Med. Vet. Zootec.

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Objetivou-se avaliar se existe correlação entre o escore de condição corporal (ECC) e a taxa de prenhez de vacas submetidas a inseminação artificial em tempo fixo (IATF) na Ilha do Marajó, Pará, na Amazônia Oriental. Foram analisadas 159 fêmeas bovinas, submetidas à IATF, selecionadas mediante avaliação clínica e ginecológica, sendo consideradas vacas clinicamente saudáveis e cíclicas, da raça Bos taurus indicus, de uma propriedade de sistema extensivo, no município de Cachoeira do Arari, na Ilha do Marajó, Pará. Foi utilizado o método de pesquisa qualitativo, com objetivo de analisar a correlação entra a taxa de prenhez e o ECC, deste lote. Das 159 fêmeas submetidas a IATF, 86 apresentaram diagnóstico de gestação positivo, obtendo-se taxa de prenhez de 54,08% e o número de fêmeas vazias foi de 73, ou seja, 45,92%. Houve correlação positiva (r = 0,167) e significativa entre a ECC e a taxa de prenhez (p<0,05). Desta forma, o estudo permitiu concluir que houve uma interdependência positiva entre a ECC e o diagnóstico gestacional. De modo que constata o efeito da condição corporal sobre a taxa de prenhez em vacas criadas na Amazônia Oriental.

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Follicular Dynamics and Pregnancy Rate in Nellore Heifers Submitted to Fixed-Time Artificial Insemination Protocols (FTAI)

Cited by 2 publications

References 26 publications

Results of Ultrasound Studies of the Growth Dynamics of Dominant, Subdominant Follicles and Determination of Estradiol Concentration in the Preovulatory Period in Cows

Results of Ultrasound Studies of the Growth Dynamics of Dominant, Subdominant Follicles and Determination of Estradiol Concentration in the Preovulatory Period in Cows

¿Existe correlação entre o escore de condição corporal e a taxa de prenhez de vacas nelores submetidas a IATF na Amazônia Oriental?

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