Applied Sciences, Vol. 15, Pages 9141: Pre-Weaning Performance and Genetic Efficiency Indices in Charolais and Limousine Calves Raised in Romania

Applied Sciences doi: 10.3390/app15169141

Authors:
Mircea Catălin Rotar
Rodica Ștefania Pelmuș
Mihail Alexandru Gras
Cristina Van

Understanding the genetic basis of growth and feed efficiency traits is essential for advancing beef cattle breeding programs. This study analyzed the average daily gain (ADG; from birth [day 0] to 200 days of age) and the Kleiber ratio (KR) in Charolais and Limousine calves raised in Romania. The data collection period was between 2020 and 2022. Genetic parameters were estimated using a maternal animal model based on 936 Charolais and 726 Limousine records sourced from the Romanian Breeding Association. For both traits, Charolais showed lower direct, maternal and total heritability estimates (0.44, 0.17 and 0.44 for ADG; 0.44, 0.17 and 0.44 for KR) compared to Limousine (0.67, 0.26 and 0.67 for ADG; 0.66, 0.26 and 0.67 for KR). The sex of calf and season of birth influenced the average daily gain and Kleiber ratio. Strong correlations were observed between the average daily gain and Kleiber ratio. The Kleiber ratio was confirmed as a reliable genetic indicator of feed efficiency across both breeds.

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