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Anim Biosci > Accepted Articles
https://doi.org/10.5713/ab.21.0458    [Accepted] Published online January 5, 2022.
Genetic study of quantitative traits supports the use of Guzerá as dual-purpose cattle
Eula Regina Carrara1,*  , Maria Gabriela Campolina Diniz Peixoto2  , Renata Veroneze1  , Fabyano Fonseca e Silva1  , Pedro Vital Brasil Ramos1  , Frank Angelo Tomita Bruneli2  , Lenira El Faro Zadra3  , Henrique Torres Ventura4  , Luiz Antônio Josahkian4, Paulo Sávio Lopes1 
1Universidade Federal de Viçosa, Viçosa, Brazil
2Embrapa Gado de Leite, Juiz de Fora, Brazil
3Centro Brasileiro de Melhoramento do Guzerá, Belo Horizonte, Brazil
4Associação Brasileira dos Criadores de Zebu, Uberaba, Brazil
Correspondence:  Eula Regina Carrara, Tel: +55-32-99807-5682, Fax: +55-32-99807-5682, Email: eulacarrara@gmail.com
Received: 5 October 2021   • Revised: 29 October 2021   • Accepted: 29 November 2021
Abstract
Objective
The aim of this study was to estimate genetic parameters for 305-day cumulative milk yield and components, growth, and reproductive traits in Guzerá cattle.
Methods
The evaluated traits were 305-day first-lactation cumulative yields (kg) of milk (MY305), fat (FY305), protein (PY305), lactose (LY305), and total solids (SY305); age at first calving (AFC) in days; adjusted scrotal perimeter (cm) at the ages of 365 (SP365) and 450 (SP450) days; and adjusted body weight (kg) at the ages of 210 (W210), 365 (W365) and 450 (W450) days. The (co)variance components were estimated using the restricted maximum likelihood method for single-trait, bi-trait and tri-trait analyses. Contemporary groups and additive genetic effects were included in the general mixed model. Maternal genetic and permanent environmental effects were also included for W210.
Results
The direct heritability estimates ranged from 0.16 (W210) to 0.32 (MY305). The maternal heritability estimate for W210 was 0.03. Genetic correlation estimates among milk production traits and growth traits ranged from 0.92 to 0.99 and from 0.92 to 0.99, respectively. For milk production and growth traits, the genetic correlations ranged from 0.33 to 0.56. The genetic correlations among AFC and all other traits were negative ( 0.43 to 0.27). Scrotal perimeter traits and body weights showed genetic correlations ranging from 0.41 to 0.46, and scrotal perimeter and milk production traits showed genetic correlations ranging from 0.11 to 0.30. The phenotypic correlations were similar in direction (same sign) and lower than the corresponding genetic correlations.

Conclusion

These results suggest the viability and potential of joint selection for dairy and beef traits in Guzerá cattle, taking into account reproductive traits.
Keywords: Beef Cattle; Dairy Cattle; Genetic Parameters; Sexual Precocity; Bos indicus


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