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

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.

Bibliographic Details

Main Authors:	CARRARA, E. R., PEIXOTO, M. G. C. D., VERONEZE, R., SILVA, F. F. e, RAMOS, P. V. B., BRUNELI, F. A. T., ZADRA, L. E. F., VENTURA, H. T., JOSAHKIAN, L. A., LOPES, P. S.
Other Authors:	EULA REGINA CARRARA, Universidade Federal de Viçosa; MARIA GABRIELA CAMPOLINA D PEIXOTO, CNPGL; RENATA VERONEZE, Universidade Federal de Viçosa; FABYANO FONSECA E SILVA, Universidade Federal de Viçosa; PEDRO VITAL BRASIL RAMOS, Universidade Federal de Viçosa; FRANK ANGELO TOMITA BRUNELI, CNPGL; LENIRA EL FARO ZADRA, Centro Brasileiro de Melhoramento do Guzerá; HENRIQUE TORRES VENTURA, Associação Brasileira dos Criadores de Zebu; LUIZ ANTÔNIO JOSAHKIAN, Associação Brasileira dos Criadores de Zebu; PAULO SÁVIO LOPES, Universidade Federal de Viçosa.
Format:	Artigo de periódico biblioteca
Language:	Ingles English
Published:	2022-01-28
Subjects:	Precocidade sexual, Bovino, Gado de Corte, Gado Leiteiro, Parâmetro Genético,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/1139427 https://doi.org/10.5713/ab.21.0458
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