Heritability estimation and genetic correlations for mature weight, visual scores, and growth traits in Nellore cattle
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...
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Sociedade Brasileira de Zootecnia
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| author | Celso Koetz Junior Vanerlei Mozaquatro Roso Patricia da Cruz Fávaro Gabriel Ribas Pereira Marcelo Henrique Favaro Borges Flávio Antônio Barca Junior Júlio Otávio Jardim Barcellos Edson Luis de Azambuja Ribeiro |
| author_facet | Celso Koetz Junior Vanerlei Mozaquatro Roso Patricia da Cruz Fávaro Gabriel Ribas Pereira Marcelo Henrique Favaro Borges Flávio Antônio Barca Junior Júlio Otávio Jardim Barcellos Edson Luis de Azambuja Ribeiro |
| author_sort | Celso Koetz Junior |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-21T08:30:02Z |
| format | Article |
| id | doaj.art-be8cb5a84bc34ea692d20e37fab6327e |
| institution | Directory Open Access Journal |
| issn | 1806-9290 |
| language | English |
| last_indexed | 2024-12-21T08:30:02Z |
| publisher | Sociedade Brasileira de Zootecnia |
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| spelling | doaj.art-be8cb5a84bc34ea692d20e37fab6327e2022-12-21T19:10:14ZengSociedade Brasileira de ZootecniaRevista Brasileira de Zootecnia1806-929048010.1590/rbz4820170246S1516-35982019000100301Heritability estimation and genetic correlations for mature weight, visual scores, and growth traits in Nellore cattleCelso Koetz JuniorVanerlei Mozaquatro RosoPatricia da Cruz FávaroGabriel Ribas PereiraMarcelo Henrique Favaro BorgesFlávio Antônio Barca JuniorJúlio Otávio Jardim BarcellosEdson Luis de Azambuja RibeiroABSTRACT 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.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100301&lng=en&tlng=enbeef cattlegrowth parametersproductive traitsselection |
| spellingShingle | Celso Koetz Junior Vanerlei Mozaquatro Roso Patricia da Cruz Fávaro Gabriel Ribas Pereira Marcelo Henrique Favaro Borges Flávio Antônio Barca Junior Júlio Otávio Jardim Barcellos Edson Luis de Azambuja Ribeiro Heritability estimation and genetic correlations for mature weight, visual scores, and growth traits in Nellore cattle Revista Brasileira de Zootecnia beef cattle growth parameters productive traits selection |
| title | Heritability estimation and genetic correlations for mature weight, visual scores, and growth traits in Nellore cattle |
| title_full | Heritability estimation and genetic correlations for mature weight, visual scores, and growth traits in Nellore cattle |
| title_fullStr | Heritability estimation and genetic correlations for mature weight, visual scores, and growth traits in Nellore cattle |
| title_full_unstemmed | Heritability estimation and genetic correlations for mature weight, visual scores, and growth traits in Nellore cattle |
| title_short | Heritability estimation and genetic correlations for mature weight, visual scores, and growth traits in Nellore cattle |
| title_sort | heritability estimation and genetic correlations for mature weight visual scores and growth traits in nellore cattle |
| topic | beef cattle growth parameters productive traits selection |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100301&lng=en&tlng=en |
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