Data/hora: 18/06/2024 11:23:18

Biblioteca(s): | Embrapa Caprinos e Ovinos.
Data corrente: | 08/06/2009
Data da última atualização: | 28/06/2023
Autoria: | LÔBO, R. N. B.; VIEIRA, L. da S.; OLIVEIRA, A. A. de; MUNIZ, E. N.; SILVA, J. M. da.
Afiliação: | Raimundo Nonato Braga Lôbo, Embrapa Caprinos e Ovinos (CNPC); Luiz da Silva Vieira, Embrapa Caprinos e Ovinos (CNPC); Amaury Apolônio de Oliveira, Embrapa Tabuleiros Costeiros; Evandro Neves Muniz, Embrapa Tabuleiros Costeiros; José M. da Silva, Embrapa Tabuleiros Costeiros.
Título: | Genetic parameters for faecal egg count, packed-cell volume and body-weight in Santa Inês lambs.
Ano de publicação: | 2009
Fonte/Imprenta: | Genetics and Molecular Biology, v. 32, n. 2, p. 288-294, 2009.
Idioma: | Inglês
Conteúdo: | Abstract: Worm infection is one of the main factors responsible for economic losses in sheep breeding in Brazil. Random regression analysis was used to estimate genetic parameters for the factors faecal egg-count (FEC), packed-cell volume (PCV) and body weight (BW) in Santa Ines lambs. Data from 119 female, offspring of nine rams, were collected between December, 2005 and December, 2006, from the experimental flock of Embrapa Tabuleiros Costeiros, the Brazilian Agricultural Research Corporation located in Frei Paulo, SE, Brazil. After weaning, females were drenched until the faecal egg count had dropped to zero. Two natural challenges were undertaken. FEC heritability was extremely variable, this increasing from 0.04 to 0.27 in the first challenge and from 0.01 to 0.52 during the second. PCV heritability peaks were 0.31 and 0.12 in the first and second challenges, respectively. In the second challenge, BW heritability was close to 0.90. The genetic correlations among these traits did not differ from zero. There is the possibility of increasing parasite resistance in Santa Ines by selecting those animals with lower FEC. Selection to increase resistance will not adversely affect lamb-growth, although lambs with a slow growth-rate may be more susceptible to infection.
Palavras-Chave: | Análise de regressão; Correlação genética; Genetic correlations; Herdabilidade; Legendre polynomials; Ostertagia circumcincta; Polinômios de Legendre; Raça Santa Inês; Random regression.
Thesagro: | Crescimento; Genética Animal; Melhoramento Genético Animal; Merino; Ovino.
Thesaurus Nal: | Gastrointestinal nematodes; Genetic correlation; Genetic improvement; Heritability; Sheep.
Categoria do assunto: | G Melhoramento Genético
Registro original: | Embrapa Caprinos e Ovinos (CNPC)
Exemplares: | CNPC - (21968-1) - UPC - AP - DD - SP 03275 -  - SP 03275 - DIS