Effect of follicular wave stage on potential fertility predictors and their repeatability coefficient in prepubertal Bos indicus (Nellore) and Bos taurus (Caracu) heifers

Bevilaqua, J.; Rodrigues, Naiara Nantes; Rossi, Guilherme Fazan; Pupin, Maria Amélia Ferrão; Silva, Marina de Oliveira; Borges, Marcelo Sant'Ana; Fernandes, Luana Gomes; Mercadante, Maria Eugênia Zerlotti; Monteiro, Fábio Morato; Oliveira, M. E. F.

doi:10.1016/j.animal.2022.100678

Cited by 3 publications

(5 citation statements)

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“…The most widespread strategy in herds that make selection pressure for precocious females is based on challenging young heifers aged between 11 and 20 months (by artificial insemination [AI], fixedtime artificial insemination [FTAI], or natural breeding) to the breeding season, at the end of which pregnant heifers will be considered precocious, and the others classified as conventional (Vozzi, 2008;Gregianini et al, 2021;Bevilaqua et al, 2022). However, for economic and animal welfare reasons, it would be important to identify precocious heifers before they are subjected to the breeding season.…”

Section: Introductionmentioning

confidence: 99%

“…A practical way to identify this condition within the farm routine is through the evaluation of the ovaries through ultrasound, highlighting the antral follicular count (AFC), as reported by Gregianini et al (2021) and Bevilaqua et al (2022). The AFC has become the focus of many studies considering its influence on the reproductive performance of bovine females (Ireland et al, 2008;Ireland et al, 2011;Pontes et al, 2011;Morotti et al, 2015;Morotti et al, 2017;Gheller et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

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Identification of parameters that affect the conception rate of precocious Nelore heifers before the start of the breeding season

Silva,

Silveira,

Silva

et al. 2024

Revista Brasileira De Zootecnia

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The objective of this study was to identify parameters, before the start of the breeding season, that affect the conception rate of precocious Nelore heifers through ultrasonographic ovarian evaluation and evaluation of weight and body condition score (BCS). A total of 407 heifers aged 404±69 days (≈14 months old), weighing 267.1±31.2 kg, and with mean BCS of 3.1±0.5, were used. Heifers were subjected to hormone treatment to induce cyclicity and, 30 days later, to a fixed-time artificial insemination (FTAI) program with three managements. Morphometric measurements of ovaries and ovarian structures were performed by transrectal ultrasonographic evaluation, as well as weighing and evaluation of BCS on D −30 and D0. Conception rate was evaluated 30 days after FTAI. The conception rate of heifers did not vary according to ovary diameter, weight, BCS, and age at first calving. However, heifers with the presence of follicle with a diameter > 6 mm at D −30 and D0 had a higher conception rate at the first FTAI. The presence of a dominant follicle greater than 6 mm at D −30 is an efficient complementary criterion to identify 14-month-old Nelore heifers with greater ability to conceive at the first FTAI before the breeding season. Antral follicle count performed on D −30 is not a good tool to predict fertility at the first FTAI, and the weight may not be a limiter to select heifers under good nutritional and health management.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Identification of parameters that affect the conception rate of precocious Nelore heifers before the start of the breeding season

Silva,

Silveira,

Silva

et al. 2024

Revista Brasileira De Zootecnia

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“…Maternal heat stress during the first trimester was shown to reduce AFC and AMH, but it did not affect subsequent first conception fertility measures (Succu et al., 2020). Breed can also have an effect on AMH concentration; with Bos indicus breeds having greater AMH concentration than Bos taurus (Bevilaqua et al., 2022), beef cattle generally having greater AMH than dairy cattle (Mossa et al., 2017) and Jersey cattle having greater AMH than crossbred and Holstein cattle in one study (Ribeiro et al., 2014). In general, nulliparous heifers are more fertile than their multiparous counterparts (Schuermann et al., 2019) and are more advantageous to breed due to a reduced genetic interval (Dawod & Elbaz, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…AMH then begins to decrease from 5 years of age due to the gradual depletion of the ovarian reserve (Gobikrushanth et al., 2018). However, few studies have been performed on the ovarian reserve in pre‐pubertal females (Bevilaqua et al., 2022).…”

Section: Introductionmentioning

confidence: 99%

Association between maternal growth in the pre‐conception and early gestational period of nulliparous dairy heifers with anti‐Müllerian hormone in their female offspring

Thomson,

Beltman,

Crowe

et al. 2023

Reprod Domestic Animals

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Anti‐Müllerian hormone (AMH) is secreted by granulosa cells of healthy, growing follicles and is positively correlated with the ovarian reserve. Maternal and environmental factors, such as nutrition, disease, parity and endocrine disruptors, are thought to have a profound impact on ovarian reserve development during early foetal life. For genetic progress, it can be advantageous to breed dairy replacements from heifers to expedite the generation interval; however, there is some evidence that nulliparous animals produce female offspring with smaller ovarian reserves compared with multiparous animals. The objective of this prospective, observational study was to determine whether maternal growth in the pre‐conception and early gestational period of nulliparous dairy heifers is associated with pre‐weaning AMH concentrations in their female offspring. Our hypothesis was that excessive growth in this period would negatively impact AMH concentrations. Seasonal, pasture‐based dairy heifer calves (n = 156) born from nulliparous dams, from six Irish farms, were blood sampled at an average of 60 days of age in spring 2022 and tested for AMH. Mixed‐effects linear regression models were constructed with Box‐Cox transformed AMH concentration as the dependent variable. The independent variables tested included maternal average daily gain (ADG) from pre‐breeding examination (PBE) to pregnancy diagnosis (PD) between 30 and 60 days in calf (DIC), ADG from PBE to PD over 60 DIC and ADG between the two PDs. Calf breed and age at sampling were forced into the models, and the farm was treated as a random effect in all models. We found that as ADG increased from the pre‐breeding period to their first PD visit, the AMH concentration in their offspring reduced. However, ADG explained only a small amount of the variation in AMH concentrations (marginal R2 = 0.041). In conclusion, the results of our study suggest that excessive growth prior to conception and in early gestation of nulliparous heifers could impact the ovarian reserve of their female offspring, and may imply that farmers should avoid excessive growth in the immediate pre‐breeding and early gestational periods.

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“…The choice of the dominant follicle during the follicular wave is manifested by a deviation in diameter or a continuation of the growth rate of the largest follicle (F1) and a decrease in the growth rate of the next largest follicle (F2), usually the diameter of F1 reaches up to 8.5mm in cattle (Bevilaqua et al 2022). The process of changing the diameter of the future dominant follicle begins approximately 12 hours before the deviation of the diameter F1 and involves an increase in granulosa cells (Ginther and Hoffman 2014).…”

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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Effect of follicular wave stage on potential fertility predictors and their repeatability coefficient in prepubertal Bos indicus (Nellore) and Bos taurus (Caracu) heifers

Cited by 3 publications

References 50 publications

Identification of parameters that affect the conception rate of precocious Nelore heifers before the start of the breeding season

Identification of parameters that affect the conception rate of precocious Nelore heifers before the start of the breeding season

Association between maternal growth in the pre‐conception and early gestational period of nulliparous dairy heifers with anti‐Müllerian hormone in their female offspring

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

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