Data/hora: 03/06/2024 11:21:48

Provedor de dados: | Revista Brasileira de Zootecnia
País: | Brazil
Título: | Heritability estimation and genetic correlations for mature weight, visual scores, and growth traits in Nellore cattle
Autores: | Koetz Junior,Celso; Roso,Vanerlei Mozaquatro; Fávaro,Patricia da Cruz; Pereira,Gabriel Ribas; Borges,Marcelo Henrique Favaro; Barca Junior,Flávio Antônio; Barcellos,Júlio Otávio Jardim; Ribeiro,Edson Luis de Azambuja.
Data: | 2019-01-01
Ano: | 2019
Palavras-chave: | Beef cattle; Growth parameters; Productive traits; Selection.
Resumo: | ABSTRACT This study was intended to estimate the genetic associations between growth traits and visual scores with possible changes in mature weight (MW) in 397,900 Nellore animals. A bi-character analysis was performed to estimate the (co)variances and genetic parameters for MW, which comprises the following traits: conformation, finishing precocity, musculature at weaning (WC, WP, and WM) and yearling (YC, YP, and YM), birth weight (BW), weight from birth to weaning (WG), weight from weaning to yearling (YG), and final index (FIND). The observed mean MW was 417.6±56.2 kg, and the direct genetic effect mean estimated heritability (    h 2    a 1) of MW was 0.45. Overall, the BW was 31.0±3.7 kg, and the estimated h² was 0.34. The heritability estimate of the maternal additive genetic component (    h 2    m 2) of BW was 0.07. We calculated the mean WG to be 144.1±26.3 and estimated the     h 2    a 2 as 0.18 and     h 2    m 2 as 0.07. The value for     h 2   a YG (0.17) and YW (0.26) were also estimated. The heritability of the weaning WC (0.17), WP (0.19), and WM (0.17) and yearling YC (0.25), YP (0.27), and YM (0.25) were estimated using visual scores. The     h 2   m values for weaning WC, WP, and WM (0.06) with visual scores were estimated. The genetic correlations between body weight (BoW) at YC and WC (0.62) were considered moderately high and positive. In addition, YP (0.18), YM (0.15), WP (0.13), and WM (0.14) were considered moderately low compared with MW. The genetic correlation between BW and FIND (0.38) was considered positive and moderate. The heritability estimation indicates that growth traits, visual scores, and weight of adult cows could be changed by selection. Cows that presented the highest     h 2   a values for live weight responded rapidly to selection based on growth characteristics, visual scores, and FIND and might result in increased final MW.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100301
Editor: | Sociedade Brasileira de Zootecnia
Relação: | 10.1590/rbz4820170246
Formato: | text/html
Fonte: | Revista Brasileira de Zootecnia  v.48 2019
Fonte: | info:eu-repo/semantics/openAccess