Data/hora: 12/06/2024 19:13:54

Provedor de dados: | 5
País: | France
Título: | Genetic variation for carcass quality traits in cultured sea bass (Dicentrarchus labrax)
Autores: | Saillant, Eric; Dupont-nivet, Mathilde; Sabourault, Marie; Haffray, Pierrick; Laureau, Stanislas; Vidal, Marie-odile; Chatain, Beatrice.
Data: | 2009
Ano: | 2009
Palavras-chave: | Dicentrarchus labrax; Communal testing; Microsatellites markers; Carcass quality; Heritability.
Resumo: | Genetic parameters for carcass quality traits were estimated in 27 families of sea bass (3 dams x 9 sires factorial mating design), raised mixed in the same tanks starting before hatching. O. spring parentage was determined a posteriori using 6 microsatellite loci. Carcass quality traits were recorded at 818 days post fertilization (mean standard length: 32.6 +/- 3.1 cm). Genetic parameters were estimated from the sire half sib variance and covariance components. Heritability of body weight (BW) and carcass processing traits (standardized to body weight) percent head weight (Head%), percent viscera weight (Viscera%) and percent visceral fat weight (VisceFat%) were relatively high ranging from 0.48 +/- 0.15 (Viscera%) to 0.87 +/- 0.23 (Head%); the estimate of heritability for fillet yield (Fillet%) was lower (0.25 +/- 0.10) but was significantly greater than zero. Body weight was positively correlated to Fillet%, Viscera%, and VisceFat%, and negatively correlated to Head%. These results indicate that these carcass processing traits can be modified by directional selection and that selection for greater BW would lead to an increase of Fillet%, Viscera% and VisceFat% and a decrease of Head%. Muscle lipid content (MuscleLipid%) was determined using two indirect methods: measurements with a Torry Fish Fatmeter (R) (TorryLipid) and determination of the percentage of dry matter content (MuscleDry%) via desiccation. Both measures were highly correlated to chemical measurements of MuscleLipid%. Regression analysis indicated a superior predictive value of TorryLipid suggesting that MuscleLipid% may be evaluated via rapid, non lethal measurements with a Torry Fish Fatmeter. Heritability estimates of TorryLipid and MuscleDry% differed significantly from zero (TorryLipid: 0.28 +/- 0.12, MuscleDry%: 0.36 +/- 0.14) indicating that MuscleLipid% could be lowered by directional selection. TorryLipid and MuscleDry% were weakly correlated to body weight and carcass processing traits suggesting that simultaneous improvement of MuscleLipid% and other carcass quality traits may require definition of multi-trait selection indices.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/2009/publication-6355.pdf

DOI:10.1051/alr/2009010

Editor: | EDP Sciences
Relação: | http://archimer.ifremer.fr/doc/00000/6355/
Formato: | application/pdf
Fonte: | Aquatic Living Resources (0990-7440) (EDP Sciences), 2009 , Vol. 22 , N. 1 , P. 105-112
Fonte: | 2009 EDP Sciences