Pregnancy Rate of Recipient Cows After Transfer of in Vitro-Produced Nellore Embryos

Jaguszeski, Mônica Zuchelli; Neto, Adalgiza Pinto; Oliveira, William de; Cattelam, Jonatas; Gregianini, Hélton Aparecido Garcia

doi:10.1590/1983-21252019v32n425rc

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…AMH is strongly associated with the ovarian response and embryo scores [ 11 ], and therefore in vitro fertilization [ 12 ]. In vitro fertilization and cattle embryo production are common practices in beef cattle production systems, especially in Zebu breeds [ 13 , 14 , 15 ]. The measurement of AMH concentration and its association with reproductive and fertility traits were widely studied in livestock, including cattle [ 16 , 17 , 18 , 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Genetic Parameters and Genome-Wide Association Studies for Anti-Müllerian Hormone Levels and Antral Follicle Populations Measured After Estrus Synchronization in Nellore Cattle

Grigoletto

Santana

Bressan

et al. 2020

Animals

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Reproductive efficiency plays a major role in the long-term sustainability of livestock industries and can be improved through genetic and genomic selection. This study aimed to estimate genetic parameters (heritability and genetic correlation) and identify genomic regions and candidate genes associated with anti-Müllerian hormone levels (AMH) and antral follicle populations measured after estrous synchronization (AFP) in Nellore cattle. The datasets included phenotypic records for 1099 and 289 Nellore females for AFP and AMH, respectively, high-density single nucleotide polymorphism (SNP) genotypes for 944 animals, and 4129 individuals in the pedigree. The heritability estimates for AMH and AFP were 0.28 ± 0.07 and 0.30 ± 0.09, and the traits were highly and positively genetically correlated (rG = 0.81 ± 0.02). These findings indicated that these traits can be improved through selective breeding, and substantial indirect genetic gains are expected by selecting for only one of the two traits. A total of 31 genomic regions were shown to be associated with AMH or AFP, and two genomic regions located on BTA1 (64.9–65.0 Mb and 109.1–109.2 Mb) overlapped between the traits. Various candidate genes were identified to be potentially linked to important biological processes such as ovulation, tissue remodeling, and the immune system. Our findings support the use of AMH and AFP as indicator traits to genetically improve fertility rates in Nellore cattle and identify better oocyte donors.

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Section: Introductionmentioning

confidence: 99%

Genetic Parameters and Genome-Wide Association Studies for Anti-Müllerian Hormone Levels and Antral Follicle Populations Measured After Estrus Synchronization in Nellore Cattle

Grigoletto

Santana

Bressan

et al. 2020

Animals

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3D culture applied to reproduction in females: possibilities and perspectives

Ferronato,

Vit,

Silveira

2024

Anim. Reprod.

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Evaluation of intrinsic and extrinsic factors affecting pregnancy rate in dual-purpose cows under tropical conditions

Zavaleta-Martínez,

Barrientos-Morales,

Abasalon-Medina

et al. 2023

Preprint

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A total of 648 embryo transfer (ET) procedures were performed between January and December 2021 and were evaluated to assess the effect of these two types of factors on in-vitro produced ET programs carried out in tropical conditions. The intrinsic factors were size and location of the corpus luteum, body condition, genetic group, age and parity; while extrinsic factors were location of the farm, environmental comfort, season in which ET was carried out, prevailing weather conditions, and the preservation, quality, and development stage of embryos at the time of transfer. A χi2 was used for analysis of main effects, and logistic regression analysis for the combined effects in each factor (intrinsic or extrinsic); additionally, a multivariate analysis of data clusters were used to find a linkage between the effects. While age of the recipient female had a negative effect (Odds ratio = 0.179–0.870) on PR (p < 0.05), being higher in younger cows; the rest of the intrinsic factors did not affect (p > 0.05) the PR. The extrinsic factors significant (p < 0.05) were THI category, season of the year and type of embryo preservation during the ET, which indicates that the higher PR (p < 0.05) were obtained in the comfort THI category, winter season and the use of fresh semen during the ET. The clustering analysis did not show any linkage (p > 0.05) between PR and the intrinsic factors, while a linkage (p < 0.05) was found with yearly season and embryo preservation as extrinsic factors. It is concluded that age of the recipient cow and environmental conditions at the time of the transfer are key factors to be considered for successful in-vitro produced ET programs using dual-purpose cows under tropical conditions.

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Pregnancy Rate of Recipient Cows After Transfer of in Vitro-Produced Nellore Embryos

Cited by 3 publications

References 7 publications

Genetic Parameters and Genome-Wide Association Studies for Anti-Müllerian Hormone Levels and Antral Follicle Populations Measured After Estrus Synchronization in Nellore Cattle

Genetic Parameters and Genome-Wide Association Studies for Anti-Müllerian Hormone Levels and Antral Follicle Populations Measured After Estrus Synchronization in Nellore Cattle

3D culture applied to reproduction in females: possibilities and perspectives

Evaluation of intrinsic and extrinsic factors affecting pregnancy rate in dual-purpose cows under tropical conditions

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