# Genetic Parameters for Limousine Interbeef Genetic Evaluation of Calving Traits

## TL;DR

This study estimates genetic correlations for calving traits across different Limousine cattle populations in multiple countries.

## Contribution

The study provides new estimates of across-country genetic correlations for calving traits in the Limousine breed using an animal model.

## Key findings

- Across-country genetic correlations for birth weight ranged from 0.69 to 0.96.
- After bending, direct genetic correlations for calving ease averaged 0.68.

## Abstract

The aim of this study was to estimate across-country genetic correlations for calving traits (birth weight, calving ease) in the Limousine breed. Correlations were estimated for eight populations (Czech Republic, joint population of Denmark, Finland, and Sweden, France, Great Britain, Ireland, Slovenia, Switzerland, and Estonia). An animal model on raw performance accounting for across-country interactions (AMACI) was used. (Co)variance components were estimated for pairwise combinations of countries. Fixed and random effects were defined by each country according to its national genetic evaluation system. The average across-country genetic correlation for the direct genetic effect was 0.85 for birth weight (0.69–0.96) and 0.75 for calving ease (0.62–0.94). The average correlation for the maternal genetic effect was 0.57 for birth weight and 0.61 for calving ease. After the estimation of genetic parameters, the weighted bending procedure was used to compute the full Interbeef genetic correlation matrix. After bending, direct genetic correlations ranged from 0.62 to 0.84 (with an average of 0.73) for birth weight and from 0.58 to 0.82 (with an average of 0.68) for calving ease.