Lifetime productivity: Genetic study of longevity and its associations with economically important traits in dairy buffaloes

Aspilcueta-Borquis, Rusbel Raúl; Seno, Leonardo de Oliveira; Neto, Francisco Ribeiro de Araujo; Santos, Daniel Jordan de Abreu; Hurtado-Lugo, Naudín; Tonhati, Humberto

doi:10.1016/j.livsci.2022.104900

Cited by 2 publications

(1 citation statement)

References 28 publications

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“…This approach has been successfully employed for the genetic evaluation of different species; however, studies that genetically correlate LG and milk yield in buffaloes are still scarce in Brazil (Bashir et al, 2007;Aspilcueta-Borquis et al, 2022). Therefore, the objectives of this study were to estimate the genetic parameters LG and MY305, using a bitrait animal model by the ssGBLUP approach, and estimate the genetic gain for LG through direct and indirect selection for milk yield.…”

Section: Introductionmentioning

confidence: 99%

Genetic parameters and association between longevity and milk production in buffaloes using the ssGBLUP method

Carvalho¹,

Lázaro²,

Stefani³

et al. 2023

Revista Brasileira De Zootecnia

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The objectives of this work were to estimate the genetic parameters for the traits longevity (LG) and accumulated milk yield at 305 days (MY305) using a bitrait animal model and the single-step GBLUP method and estimate the genetic gain for LG through direct and indirect selection for MY305. We used 4,057 records of first lactations of Murrah dairy buffaloes, collected between 1987 and 2020, belonging to six Brazilian herds located in the states Ceará, Rio Grande do Norte, and São Paulo and 960 animals genotyped using the 90K Axiom Buffalo Genotyping (Thermo Fisher Scientific, Santa Clara, CA) to estimate the genetic parameters. The heritability estimate was 0.25 for MY305 and 0.13 for LG. The genetic gain for LG was 0.13 months under direct selection, and 0.14 months under indirect selection, which results in a relative selection efficiency of 11% under selection for MY305 compared with the direct selection. The genetic correlation between the two traits was 0.77, indicating that animals with genetic potential for high MY305 tend to live longer. The genetic trends for MY305 and LG were 0.22 kg/year and 5.20 days/year, respectively, indicating a positive response, which reaffirms its relationship with the high genetic correlation between the two traits.

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Section: Introductionmentioning

confidence: 99%

Genetic parameters and association between longevity and milk production in buffaloes using the ssGBLUP method

Carvalho¹,

Lázaro²,

Stefani³

et al. 2023

Revista Brasileira De Zootecnia

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Genomic analysis of genotype–environment interaction in age at first calving of Murrah buffaloes

dos Santos,

de Araujo Neto,

de Oliveira Seno

et al. 2024

J Animal Breeding Genetics

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Age at first calving (AFC) is a measure of sexual maturity associated with the start of productive life of dairy animals. Additionally, a lower AFC reduces the generation interval and early culling of females. However, AFC has low heritability, making it a trait highly influenced by environmental factors. In this scenario, one way to improve the reproductive performance of buffalo cows is to select robust animals according to estimated breeding value (EBV) using models that include genotype–environment interaction (GEI) with the application of reaction norm models (RNMs). This can be achieved by understanding the genomic basis related to GEI of AFC. Thus, in this study, we aimed to predict EBV considering GEI via the RNM and identify candidate genes related to this component in dairy buffaloes through genome‐wide association studies (GWAS). We used 1795 AFC records from three Murrah buffalo herds and formed environmental gradients (EGs) from contemporary group solutions obtained from genetic analysis of 270‐day cumulative milk yield. Heritability estimates ranged from 0.15 to 0.39 along the EG. GWAS of the RNM slope parameter identified important genomic regions. The genomic window that explained the highest percentage of genetic variance of the slope (0.67%) was located on BBU1. After functional analysis, five candidate genes were detected, involved in two biological processes. The results suggested the existence of a GEI for AFC in Murrah buffaloes, with reclassification of animals when different environmental conditions were considered. The inclusion of genomic information increased the accuracy of breeding values for the intercept and slope of the reaction norm. GWAS analysis suggested that important genes associated with the AFC reaction norm slope were possibly also involved in biological processes related to lipid metabolism and immunity.

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Lifetime productivity: Genetic study of longevity and its associations with economically important traits in dairy buffaloes

Cited by 2 publications

References 28 publications

Genetic parameters and association between longevity and milk production in buffaloes using the ssGBLUP method

Genetic parameters and association between longevity and milk production in buffaloes using the ssGBLUP method

Genomic analysis of genotype–environment interaction in age at first calving of Murrah buffaloes

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