Shouqun Jiang
Guangdong Academy of Agricultural Sciences, China
Title: Effects Of Dietary Threonine Levels On Laying Perfomance,Offspring Traits And Its Regulation Of Embryo Expressions Ofptor And Tdh In Chinese Yellow-Feathered Broiler Breeder Hens
Biography
Biography: Shouqun Jiang
Abstract
The effects of dietary threonine (Thr)levels on performance, offspring traits,embryo protein deposition in broiler breeder hens was investigated. A total of 720Lingnan yellow-feathered broiler breeder hens were randomly divided into 1 of 6 dietary treatments with 6 replicates per treatment (20 birds per replicate). The hens were fed either the basal diet (Thr 0.38%) or the basal diet supplemented with 0.00%, 0.12%, 0.24%, 0.36%, 0.48% and 0.60% Thrfrom 29w to 38w. The results showed that Thrsupplementation produced quadratic positive responses in laying rate. Hatchability was higher in breeders fed 0.12% and 0.24%Thr than those of control birds (P<0.05). Dietary supplemental Thr had significant effects on expressions of mucin 2 (MUC2) in duodenum, colon and uterus, and ZO-1 in duodenum of hens (P<0.05). In chick embryo at embryonic age 18, there were significant upregulations of dietary Thr levels onthe transcripts of liver and breast musclepoultry target of rapamycin, thigh threonine dehydrogenase, duodenum and ileumaminopepridase (P<0.05), but no effects on MUC2expression of duodenum and ileum (P>0.05).Chick livability and serum uric acid nitrogen concentration were increased,and liver glutamic-pyruvic transaminase activity was decreased by dietary Thrsupplementation (P<0.05).It concludedthat there were positive effects of addingThr on laying production of breeder hens and offspring performance, and this was associated with the regulations of gene expressions related to amino acid transportation and protein desposition. The optimal dietary Thrsupplemental level was 0.298% or 0.388 g/d for broiler breeders.