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| Cavalcante Neto,A.; Lui,J.F.; Sarmento,J.L.R.; Ribeiro,M.N.; Monteiro,J.M.C.; Fonseca,C.; Tonhati,H.. |
| The effect of environmental and genetic effects on the farrowing interval in Dalland (C-40) sows in the Southeast of Brazil was studied. Data consisting of 1,013 farrowing intervals recorded in two herds were analyzed, using a model that included the sire and the dam as random effects and the year of farrowing, the herd and the farrowing season as fixed effects, plus the covariables sow's age at farrowing, litter size at birth, lactation length and weaning-estrus interval. For the farrowing interval first only, variance components were estimated by REML, with an animal model that included, as fixed effect, a contemporary group and, as random effects, the additive genetic variance and the error. The mean farrowing interval was 140.9+5.7 days, with a 4.0%... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Suíno; Característica reprodutiva; Herdabilidade; Produtividade. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352009000100040 |
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| Cavalcante Neto,A.; Lui,J.F.; Sarmento,J.L.R.; Ribeiro,M.N.; Monteiro,J.M.C.; Fonseca,C.; Tonhati,H.. |
| The genetic and environmental factors that affect age at first conception (AFC) of gilts were evaluated, using 466 observations of Dalland animals (C-40). The software program MTDFREML was used to assess the genetic parameters on an animal model that included as fixed effect, contemporary group and, as random effects, the additive genetic, the common litter and the error. Mean value of AFC was 241.12±25.9 days, with CV of 8.5 %. Variance analysis showed that year (P<0.01), season (P<0.01) and herd effects (P<0.01) were important sources of variation of AFC. The throat effect (P=0.34) was not important for the AFC, but the mother of the gilts (P<0.01) was an important source of variation. The heritability estimate was 0.44±0.14 that this trait... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Suíno; Fatores não genéticos; Parâmetro genético; Puberdade. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352008000200035 |
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