title: Effects of balanced selection for intramuscular fat and abdominal fat percentage and estimates of genetic parameters.
abstract: Intramuscular fat (IMF) content contributes to meat flavor and improves meat quality. Excessive abdominal fat, however, leads to a waste of feed resources. Here, an independent up-selection for IMF was used as a control (Line C), and a balanced selection program, with up-selection for IMF and down-selection AFP (Line B), was studied in JingXing yellow chickens. The mean of IMF and AFP within a family was the phenotypic value upon which selection was based. The selective pressures of IMF in line B and line C were the same in each generation. At G5, the IMF was significantly higher (P < 0.05) than that at G0 in both lines. For AFP, Line C was significantly higher at G5 (P < 0.05) than at G0, but the difference in Line B was not significant (P > 0.05). IMF increased by 11.4% and AFP decreased by 1.5% in Line B compared with the G0 generation. In contrast, the IMF increased by 17.6%, but was accompanied by an 18.7% increase in AFP, in control Line C. Of 10 other traits measured, body weight at 56 d age (BW56) and the percentages of eviscerated weight (EWP) showed a significant difference between the 2 lines (P < 0.05). The heritabilities for IMF and AFP, estimated by the DMU package, were 0.16 and 0.32, respectively. A moderate positive correlation existed between IMF and AFP (0.35). A balanced selection program for increasing IMF while controlling AFP (Line B) is shown here to be effective in practical chicken breeding.
authors.affiliation: Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, P. R. China.|State Key Laboratory of Animal Nutrition, Beijing 100193, P. R. China.
authors.forename: M
authors.initials: M
authors.lastname: Jiang
authors.affiliation: Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, P. R. China.|College of Animal Science and Technology, Hunan Agricultural University, Changsha 410128, P. R. China.
authors.forename: W L
authors.initials: WL
authors.lastname: Fan
authors.affiliation: Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, P. R. China.|College of Animal Science and Technology, Hunan Agricultural University, Changsha 410128, P. R. China.
authors.forename: S Y
authors.initials: SY
authors.lastname: Xing
authors.affiliation: Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, P. R. China.|College of Animal Science and Technology, Hunan Agricultural University, Changsha 410128, P. R. China.
authors.forename: J
authors.initials: J
authors.lastname: Wang
authors.affiliation: Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, P. R. China.|College of Animal Science and Technology, Hunan Agricultural University, Changsha 410128, P. R. China.
authors.forename: P
authors.initials: P
authors.lastname: Li
authors.affiliation: Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, P. R. China.|College of Animal Science and Technology, Hunan Agricultural University, Changsha 410128, P. R. China.
authors.forename: R R
authors.initials: RR
authors.lastname: Liu
authors.affiliation: Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, P. R. China.|College of Animal Science and Technology, Hunan Agricultural University, Changsha 410128, P. R. China.
authors.forename: Q H
authors.initials: QH
authors.lastname: Li
authors.affiliation: Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, P. R. China.|College of Animal Science and Technology, Hunan Agricultural University, Changsha 410128, P. R. China.
authors.forename: M Q
authors.initials: MQ
authors.lastname: Zheng
authors.affiliation: Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, P. R. China.|College of Animal Science and Technology, Hunan Agricultural University, Changsha 410128, P. R. China.
authors.forename: H X
authors.initials: HX
authors.lastname: Cui
authors.affiliation: Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, P. R. China.|College of Animal Science and Technology, Hunan Agricultural University, Changsha 410128, P. R. China.
authors.forename: J
authors.initials: J
authors.lastname: Wen
authors.affiliation: Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, P. R. China zhaoguiping@caas.cn.|College of Animal Science and Technology, Hunan Agricultural University, Changsha 410128, P. R. China.
authors.forename: G P
authors.initials: GP
authors.lastname: Zhao
mesh_terms: D050153:Abdominal Fat / Q000378:metabolism*; D000273:Adipose Tissue / Q000378:metabolism*; D000818:Animals; D002645:Chickens / Q000235:genetics* / Q000378:metabolism; D005260:Female; D040941:Heredity; D008297:Male; D018482:Muscle, Skeletal / Q000378:metabolism; D012641:Selection, Genetic
keywords: abdominal fat percentage; balanced selection; genetic correlation; heritability; intramuscular fat