Efeitos genéticos e não-genéticos sobre o intervalo de parto em fêmeas suínas no Sudeste do Brasil / Genetic and environmental effects on the farrowing interval in sows in the southeastern region of Brazil
Arq. bras. med. vet. zootec
;
61(1): 280-285, fev. 2009.
Article
in Portuguese
| LILACS
| ID: lil-513053
ABSTRACT
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 percent coefficient of variation. Variance analysis showed no effect of either year, season of farrowing or herd on the farrowing interval. The sire effect was not important for the farrowing interval, but the dam represented an important source of variation. The total number of piglets born and the sow's age at farrowing had no influence on the farrowing interval. The length of lactation exerted an influence on the farrowing interval, accounting for 19.4 percent of the total variation of this trait. Likewise, the linear regression of the weaning-estrus interval in relation to the farrowing interval was highly significant, accounting for 51.7 percent of the total variation. The heritability estimate was 0.00, suggesting that no genetic gain can be obtained by selection for a shorter farrowing interval.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Reproduction
/
Swine
/
Pregnancy, Animal
/
Genetics
Type of study:
Evaluation studies
/
Prognostic study
Limits:
Animals
Country/Region as subject:
South America
/
Brazil
Language:
Portuguese
Journal:
Arq. bras. med. vet. zootec
Journal subject:
Veterinary Medicine
Year:
2009
Type:
Article
Affiliation country:
Brazil
/
Chile
Institution/Affiliation country:
Escola Agrotécnica Federal/BR
/
UA/PT
/
UNESP/BR
/
Universidade Federal Rural de Pernambuco/BR
/
Universidade Federal do Piauí/BR
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