The Research Of The Effection About The Interaction-analysis Of The Multi-vitamin And The Dietary Protein Level To The Heat Stress Egg Breed Chicken

This experiment was conducted with parent generation Hyline brown laying hens.The egg breeding chicken experiment designed for 2×2 factors repeated experiments.128 egg breed chickens at 207 days old were divided into 4 groups with one-way random design,each group containing 4 replicates(8 birds per replicate).The diet for this experiment was partitioned into two parts as high level dietary protein team and low level dietary protein team;0mg/kg and 667mg/kg multi-vitamin were added respectively into the diet,in order to improve the breeding hens'ability of resisting heat stress.Considering the production cost as a reference factor,study on the effection of the chicken house ambient temperature,reltive hunidity and different composition diets to the egg breeding chickens'performance,egg quality and blood biochemical in the summer production conditions.32 breeder cocks were divided into 2 groups with one-way random design,each group containing 4 replicates(4 birds per replicate).In the precondition of the same protein level in diet,0mg/kg and 667mg/kg multi-vitamin were added respectively into the diet,in order to study the effection of multi-vitamin the breeder cocks'reproductive performance.The results of the egg breeding chicken experiment showed that:when the daily mean temperature were 26～29℃and the reltive hunidity were 88%～91% in the chicken house,With temperature increasing, the average daily feed intake gradually decreases. The change of average egg production and average egg fertility rate lagging behind the temperatures'.different levels of protein and multi-vitamin have no obvious effect on The egg breed chicken average daily intake and average egg weight.when the egg breeding chicken consumed the high protein level deit, the laying rate improved(p>0.05)and the egg fertility rate improved significantly(p<0.05).when at the same level of crude protein in the diet, adding 667mg/kg multi-vitamin could significantly increase the fertilization rate of breeding eggs (p<0.05).To low crude protein diet,adding 667mg/kg multi-vitamin could significantly increase eggshell thickness (p<0.05).the high level protein diet could significantly improve the proportion of units Harrington (p<0.05). Adding 667mg/kg multi-vitamin in the diet could maintain the serum potassium ion concentration (p<0.05).The group of high level protein diet has a higher serum calcium ion concentration (p>0.05).The group of High level protein diet had higher serum phosphorus concentration (p<0.05) . when feeding high level protein diet, the serum glucose concentrations decreased at least (p>0.05).the content of T3 of the serum can be maintained by the high level protein diet and multi-vitamin (p>0.05),the content of T4of the serum was declined by adding multi-vitamin (p<0.05).breeder cocks test results showed that:addition of multi-vitamin increased the intake of breeder cocks,semen volume and the sperm motility(p> 0.05).Economic accounting results indicated that:compared with the group of the low level protein diet +0 mg / kg multi-vitamin, the low level protein diet +667 mg / kg multi-vitamin,the high level protein diet +0 mg / kg multi-vitamin and the high level protein diet +667 mg / kg multi-vitamin can increased 0.043,0.067 and 0.046 yuan from every chicken per day.