Genetic analysis of in-vitro embryo production traits in Dairy Gir cattle

Vizoná, Rafael Guimarães; Perez, Bruno da Costa; Peixoto, Maria Gabriela Campolina Diniz; Viana, J. H. M.; Ventura, Ricardo Vieira; Filho, Aníbal Eugênio Vercesi; Balieiro, J. C. C.

doi:10.1016/j.theriogenology.2020.02.014

Cited by 12 publications

(22 citation statements)

References 33 publications

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“…For VO, the values of our work are higher than the reports of 15.6±12.7 by Perez et al (2017b) for the Guzerá breed, and of 12.39±10.04 by Vizoná et al (2020) for dairy Gir breed. Results for VE are similar to those of Vizoná et al (2020), 4.59±4.64, and lower than the values of Perez et al (2017b), 6.1±5.7.…”

Section: Datacontrasting

confidence: 88%

“…The performance of Bos indicus and Bos taurus cows under in vitro embryo production technology has been reported in the literature, and the results indicate that there are significant differences between genetic groups (Vizoná et al, 2020). However, there is no obvious biological explanation for the greater number of oocytes recovered in Bos indicus (Pontes et al, 2011).…”

Section: Datamentioning

confidence: 99%

“…For VO, h 2 ranges from 0.16 to 0.25 in Brazilian Guzerá breed depending on the type of distribution used (Perez et al, 2017b). Using a Bayesian model with Poisson distribution, Vizoná et al (2020) reported h 2 of 0.32. In studies using information from MOET (multiple ovulation and embryo transfer), e.g., Merton et al (2009) and Perez et al (2017a), there can be a pre-selection of animals that will be subjected to collection, which can result in lower h 2 (Vizoná et al, 2020).…”

Section: Heritabilitymentioning

confidence: 99%

“…According to Merton et al (2009) and Cornelissen et al (2017), the h 2 for TO is higher than the h 2 for CE and VE. Comparing the estimates between the traits, the VE has the lowest h 2 , which must be because this trait has a large number of non-genetic factors that can influence the result and affect service sire (Vizoná et al, 2020).…”

Section: Heritabilitymentioning

confidence: 99%

“…The high R reported for oocyte and embryo count traits indicates that donors, which had high counts of oocytes and embryos in the first ovum pick-up, should maintain this result in the next ovum pick-up. Therefore, donors can be selected after the first ovum pick-up, with special attention to puncturing young females (even in pre-puberty); this procedure should give good indications of life potential of these animals (Vizoná et al, 2020).…”

Section: Heritabilitymentioning

confidence: 99%

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Genetic evaluation of oocyte and embryo production in dairy Gir cattle using repeatability and random regression models

Feltes¹,

Negri²,

Raidan³

et al. 2022

Revista Brasileira De Zootecnia

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The objective of this work is to estimate genetic parameters and breeding values to improve embryo and oocyte production, using repeatability and random regression models (RRM) for Gir dairy cattle. We used 11,398 records of ovum pick-up from 1,747 dairy Gir donors and evaluated sixteen different models: the traditional repeatability model and fifteen RRM, each of which considered a different combination of Legendre polynomial regressors to describe the additive genetic and permanent environment effects. The 4G1P model (four regressors for the genetic effect and one regressor for the permanent environment effect) is the most suitable model to analyze the number of viable and total oocytes, while the 3G1P is the best model to analyze the number of cleaved and viable embryos, according to the values of the Akaike information criterion (AIC) and the Bayesian information criterion (BIC). The heritability estimated with the RRM was higher than that estimated with the repeatability model. The high repeatability reported for oocyte and embryo count traits indicates that donors, which had high oocyte and embryo counts in the first ovum pick-up, should maintain this result in the next ovum pick-up. Genetic correlations between adjacent ages were high and positive, while genetic correlations between extreme ages were weak. We observed a reranking of the top sires and females (heifers and cows) over the period evaluated. The reliability of the estimated breeding values by RRM showed changes across age, and the expected genetic gains by RRM are larger. This shows that RRM is most suitable alternative for the evaluation and selection of oocyte and embryo count traits.

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Section: Datacontrasting

confidence: 88%

Section: Datamentioning

confidence: 99%

Section: Heritabilitymentioning

confidence: 99%

Section: Heritabilitymentioning

confidence: 99%

Section: Heritabilitymentioning

confidence: 99%

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Genetic evaluation of oocyte and embryo production in dairy Gir cattle using repeatability and random regression models

Feltes¹,

Negri²,

Raidan³

et al. 2022

Revista Brasileira De Zootecnia

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Impact of heat stress on genetic evaluation of oocyte and embryo production in Gir dairy cattle

Feltes,

Negri,

Raidan

et al. 2023

Trop Anim Health Prod

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Comparing Bayesian models for the genetic evaluation of oocytes and embryo counts in Dairy Gir cattle

Feltes,

Campos,

Raidan

et al. 2024

J Appl Genetics

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Count traits are usually explored in livestock breeding programs and it usually does not t into Normal distribution, requiring alternatives to adjust the phenotype to estimate accurate genetic parameters and breeding values. Alternatively, distribution such as Poisson can be used to evaluate count traits. This study aimed to compare and discuss the genetic evaluation for oocyte and embryo counts considering Gaussian (untransformed variable -LIN, transformed by logarithm -LOG, transformed by Anscombe -ANS) and Poisson (POI) distributions. The data comprised 11343 total oocytes, viable oocytes, cleaved embryos, viable embryos records of ovum pick-up from 1740 dairy Gir heifers and cows. The genetic parameters and breeding values were estimated by the MCMCglmm package of the R software. The posterior means of heritability varied from 0.40 (LIN) to 0.49 (POI) for TO; 0.39 (LIN) to 0.49 (POI) for VO; 0.30 (LOG) to 0.41 (POI) for CE; 0.19 (LIN) to 0.32 (POI) for VE, respectively. The posterior means of repeatability varied from 0.56 (LIN) to 0.65 (POI) for TO; 0.53 (LOG) to 0.63 (POI) for VO; 0.44 (LOG) to 0.60 (POI) for CE; 0.36 (LOG) to 0.56 (POI) for VE, respectively. Deviance information criterion and mean squared residuals indicated that POI model should be used for genetic evaluation of embryo and oocytes count traits. The Spearman rank correlation between estimated breeding value (EBV) for embryo and oocytes count traits computed by POI, LOG, and ANS models was high (ranging from 0.77 to 0.99), indicating little reordering among the best animals. The POI model is the most adequate for genetic evaluation, resulting in more reliable EBV for Dairy Gir cattle of oocyte and embryo counts traits.

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Genetic analysis of in-vitro embryo production traits in Dairy Gir cattle

Cited by 12 publications

References 33 publications

Genetic evaluation of oocyte and embryo production in dairy Gir cattle using repeatability and random regression models

Genetic evaluation of oocyte and embryo production in dairy Gir cattle using repeatability and random regression models

Impact of heat stress on genetic evaluation of oocyte and embryo production in Gir dairy cattle

Comparing Bayesian models for the genetic evaluation of oocytes and embryo counts in Dairy Gir cattle

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