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http://dx.doi.org/10.5713/ab.21.0458

Genetic study of quantitative traits supports the use of Guzera as dual-purpose cattle  

Carrara, Eula Regina (Department of Animal Science, Federal University of Vicosa)
Peixoto, Maria Gabriela Campolina Diniz (Embrapa Dairy Cattle)
Veroneze, Renata (Department of Animal Science, Federal University of Vicosa)
Silva, Fabyano Fonseca e (Department of Animal Science, Federal University of Vicosa)
Ramos, Pedro Vital Brasil (Department of Animal Science, Federal University of Vicosa)
Bruneli, Frank Angelo Tomita (Embrapa Dairy Cattle)
Zadra, Lenira El Faro (Brazilian Center for the Genetic Improvement of Guzera)
Ventura, Henrique Torres (Brazilian Association of Zebu Breeders)
Josahkian, Luiz Antonio (Brazilian Association of Zebu Breeders)
Lopes, Paulo Savio (Department of Animal Science, Federal University of Vicosa)
Publication Information
Animal Bioscience / v.35, no.7, 2022 , pp. 955-963 More about this Journal
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; Bos indicus; Dairy Cattle; Genetic Parameters; Sexual Precocity; Guzera;
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