Effects of One Generation Divergent Selection for Plasma very Low Density Lipoprotein Concentration

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Effects of One Generation Divergent Selection for Plasma very Low Density Lipoprotein Concentration and Interaction between Genotype and Nutrition on Broiler Chickens

After 1500 male and female broiler chickens from a pure line were selected on the basis of plasma very low density lipoprotein (VLDL) concentration at 8 weeks of age,abdominal fat(AF),liver fat,body weight,meat traits and plasma lipids were determined,and effects of interaction between genotype and nutrition on AF and its correlated traits were studied.1) It was efficient to select against AF on the basis of plasma VLDL concentration.The indirect response of gizzard fat was the greatest,and that of liver fat was the second.AF was decreased,whereas liver fat was increased,feed conversion efficiency during growing period were improved, body weight and meat traits were both not influenced by selecting for low plasma VLDL concentration.2) Nutrition had significant effect on fat deposition and growth performance.Interaction between line and diet had evident effect on AF and its correlated traits.In general,diet had greater effect on H-VLDL line than L-VLDL line,namely chickens of L-VLDL line were less sensitive to diet than those of H-VLDL line.3) Due to high coefficients of variation of plasma VLDL and AF in H-VLDL and L-VLDL lines in the first generation.It will be possible that plasma VLDL is to be selected continuously to breed low fat line of broiler chickens of which the feed conversion efficiency is much better.Moreover,family combined with individual selection should be adopted during future generation selection and breeding because of significant family difference in plasma VLDL concentration.