Data/hora: 01/06/2024 00:59:50

Provedor de dados: | 65
País: | Brazil
Título: | Maternal inheritance on reproductive traits in Brangus-Ibagé cattle
Autores: | Henkes,Luis Ernani; Benavides,Magda Vieira; Oliveira,João Francisco Coelho; Moraes,José Carlos Ferrugem; Weimer,Tania Azevedo.
Data: | 2004-08-01
Ano: | 2004
Palavras-chave: | MtDNA; Maternal inheritance; Calving interval.
Resumo: | Cytoplasmic inheritance influence on reproductive traits was investigated in the Brangus-Ibagé cattle (3/8 Nelore x 5/8 Aberdeen Angus). Additive genetic effects were responsible for 12% ± 11% of phenotypic variation observed in first calving interval, but their contribution dropped to zero when all calving intervals (CI) were considered. The heritability estimate for age at first calving (AFC, in days) was 0.19 ± 0.09. Mitochondrial lineage (MIT) had negligible effects on phenotypic variances of calving interval (0.0 ± 0.02), calf birth weight (0.0 ± 0.01), and cow weight at calving (0.0 ± 0.01). However, for the age at first calving, MIT accounted for 0.15 ± 0.07 of total variation. Cow weight at calving had a significant linear effect on CI and AFC. Three D-loop mtDNA mutations significantly affected either calving interval (T®C at sites 16,113 and 16,119) or calf birth weight (T®C at site 16,113). The C variants had decreased CI (29 and 32 days, respectively) and increased calf weight (0.6kg). Although the effects were small, direct selection for these mutation-carrier cows might improve the reproductive and developmental performance in this herd.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782004000400030
Editor: | Universidade Federal de Santa Maria
Relação: | 10.1590/S0103-84782004000400030
Formato: | text/html
Fonte: | Ciência Rural  v.34 n.4 2004
Fonte: | info:eu-repo/semantics/openAccess