Publications by authors named "Jose Antonio Torres-Vazquez"
Article Synopsis
- Heifer survival and fertility are crucial for the profitability of dairy farms, with a focus on early first calving for better productivity, but the genetic factors influencing these traits are not fully understood.
- Recent research utilized the CDCB’s genomic database to conduct GWAS analyses, finding no major QTL linked to heifer livability and one significant QTL in the MHC region related to early first calving.
- Gene-trait associations were explored, revealing a notable number of genes linked to early calving, particularly in immune-related regions, highlighting the importance of the immune system in reproductive traits.
The objectives of this study were to compare different models for analysing body weight (BW) and average daily feed intake (ADFI) data collected during a 70-day feedlot test period and to explore whether genetic parameters change over time to evaluate the implications of selection response. (Co)variance components were estimated using repeatability and random regression models in 2,071 Angus steers. Models included fixed effects of contemporary group, defined as herd-year-observation_date-age, with additive genetic and permanent environmental components as random effects.
View Article and Find Full Text PDFGenetic and phenotypic parameters for feed efficiency, growth, and carcass traits for Australian Angus beef cattle were estimated. Growth traits included birth weight (BWT), 200-d weight (200dWT), 400-d weight (400dWT), and 600-d weight (600dWT). Traits associated with feed efficiency were average daily weight gain (ADG), metabolic midweight, average of daily feed intake (FI), feed conversion ratio (FCR), residual feed intake (RFI), and residual gain (RG).
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