Publications by authors named "Rodrigo Almeida Teixeira"
Correction to: Influence of different environmental challenges on the expression of reproductive traits in Holstein cattle in Southern Brazil.
Trop Anim Health Prod
October 2024
Influence of different environmental challenges on the expression of reproductive traits in Holstein cattle in Southern Brazil.
Trop Anim Health Prod
September 2024
Article Synopsis
- The study evaluated how genotype-environment interactions (GEI) affect traits in Holstein cattle, specifically age at first calving (AFC), age at first service (AFS), and calving interval (CI), using data from 179,492 animals in Paraná, Brazil.
- Researchers applied a reaction norm model to assess environmental gradients and heritability of these traits, finding moderate heritability for AFC (0.23) in easier environments, but low heritability for others.
- Significant GEI effects were noted for AFC and AFS, indicating that cattle that perform well in one environment may not do so in another, highlighting the complexity of breeding strategies.
Novel Candidate Genes Involved in an Initial Stage of White Striping Development in Broiler Chickens.
Animals (Basel)
August 2024
Article Synopsis
- White striping (WS) is a myopathy found in broiler chickens, marked by white stripes in muscle tissue and linked to economic losses, with its causes still unclear.
- A study identified 30 differentially expressed genes in the breast muscle of affected chickens, highlighting 14 new candidates connected to muscle development, lipid metabolism, and collagen.
- The findings suggest that while some genes might play a role in the early development of WS, the expression of others may change as the condition progresses.
Genetic association between fat-to-protein ratio and traits of economic interest in early lactation Holstein cows in Brazil.
Trop Anim Health Prod
February 2024
The aims of this study were to estimate the genetic parameters for fat-to-protein ratio (F:P) within the first 90 days of lactation and to examine their genetic associations with daily milk yield (MY), somatic cell score (SCS), and calving interval between the first and second calving (IFSC) and between the second and third calving (ISTC) during the first three lactations of Holstein cows. We utilized 200,626 production-related data officially recorded from 77,436 cows milked two or three times a day from 2012 to 2022, sourced from the Holstein Cattle Breeders Association of Paraná State, Brazil. The (co)variance components were estimated using animal models, adopting the restricted maximum likelihood (REML) method with single-trait analysis (for heritability and repeatability) and two-trait analysis (for genetic and phenotypic correlations), per lactation.
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