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Analysis of genetic correlations between beef traits in young bulls and primiparous cows belonging to the dual-purpose Rendena breed

Published online by Cambridge University Press:  03 August 2018

N. Guzzo Open the ORCID record for N. Guzzo [Opens in a new window] ,
C. Sartori Open the ORCID record for C. Sartori [Opens in a new window]  and
R. Mantovani
N. Guzzo*
Affiliation:
Department of Agronomy, Food, Natural Resources, Animals and Environment, University of Padua, Viale dell’Universita’, 16-35020 Legnaro, Padua, Italy
C. Sartori
Affiliation:
Department of Agronomy, Food, Natural Resources, Animals and Environment, University of Padua, Viale dell’Universita’, 16-35020 Legnaro, Padua, Italy
R. Mantovani
Affiliation:
Department of Agronomy, Food, Natural Resources, Animals and Environment, University of Padua, Viale dell’Universita’, 16-35020 Legnaro, Padua, Italy
*
†E-mail: [email protected]
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Abstract

Selection for beef traits in Italian dual-purpose breeds is often carried out using growth and in vivo conformation recorded on young, performance tested bulls and muscularity traits scored during routinely linear type evaluation on primiparous cows. In this context, the knowledge of the genetic structure of traits obtained in different sexes and at different times is necessary for a proper selection plan. This study aimed to estimate, in the local dual-purpose Rendena breed, the genetic relationships between muscularity linear type traits from primiparous cows, the same traits scored on candidate young bulls, and the performance test traits recorded in candidate young bulls. Type traits included: front (chest and shoulder), back (loins and rump); thigh, buttocks side and rear views (two traits). Performance test traits were: average daily gain; EUROP fleshiness evaluation; and dressing percentage. Muscularity linear type traits were recorded on 11 992 first parity cows, and the muscularity type traits were scored on 957 candidate young bulls. Heritability estimates obtained for muscularity traits were moderate in young bulls (on average 0.326), about 16% higher than in primiparous cows. The average heritability for performance test traits in young bulls resulted 0.342. Moderate to strong genetic correlations were found between performance test and muscularity type traits collected in young bulls (from 0.500 between front (chest and shoulder) and average daily gain to 0.955 between thigh, buttocks side view and in vivo dressing percentage). The genetic relationships obtained between muscularity linear type traits of primiparous cows and performance traits of young bulls were variable (from a null correlation between front (chest and shoulder) and average daily gain to 0.822 between thigh, buttocks rear view and dressing percentage), with an average genetic correlation of 0.532. Generally, the traits measured during performance testing in young bulls were favourably correlated with muscularity traits evaluated on primiparous cows, indicating a common selection pathway.

Keywords

local breedcattletype traitsperformance testgenetic parameters
Type
Research Article
Information
animal , Volume 13 , Issue 4 , April 2019 , pp. 694 - 701
Copyright
© The Animal Consortium 2018 

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