Effects Of Maternal Dietary Protein Level On Meat Quality And Myofibrillar Protein Functionalities Of Offspring

This paper contains three parts : (1) According to the protein level ,the hen dietary was divided into three groups 20 %, 15 % and 10%. in order to research the production performance and egg quality of maternal protein level.(2) After hatching of the three groups, experiment of slaughtering was done 84 days later under the same protein and energy level, to measure the quality of carcass and meat and research the influence of maternal protein level to the offspring meat quality.(3)With the single factor experiment, changes of the gel functional properties of myofibrillar protein under different pH values was analysed of the three groups.Chapter one With the same level of energy and nourish material but different maternal protein level, the laying rate among the high protein group ,low protein group and control group had significantly difference(p<0.05),of which the high protein group was higher than the low protein group. Different protein level of the hen dietary played an important role in influencing the size of the eggs, content of water and dry matter and so on .The egg weight of high protein group was 3.95%heavier than the low group(p<0.05).The result suggested that the quality and size of the eggs influenced the growth and development of the offspring. Eggs in the high protein group were heavier and the protein content was also higher .The offspring of the high protein group grew faster and gained heavier weight. Chapter two With diverse maternal nourish environment, the offspring carcass quality differed a lot. The weight alive of the high protein group and control group was much heavier than the low group (p<0.05).The press loss of the thigh high protein group and control group were obviously much more than the low protein group (p<0.05),and so were the breast high protein group and control group. The shear force of the thigh high protein group and control group were much higher than the low protein group (p<0.05).The muscle histology index suggested that diameter of muscle fibers in breast high protein group was much bigger than the low group (p<0.05) while the density of muscle fibers in the high protein group was much smaller than the low group (p<0.05) and the distance from muscle...