Effects Of Growth Hormone Soluble Powder On Growth Performance In Broilers And Security Preliminary Study

Growth hormone(GH)plays a very important role on growth of animal.This article aims to explore and study the effects of growth hormone soluble powder and dietary protein levels on growth performance in broilers,and safety evaluation of growth hormone in broilers.The study has important significance for guiding the rational use of GH.The broilers were regarded as object of the study,four experiments were designed.The first experiment was ? clinical trials of effects of growth hormone soluble powder on growth performance in broilers.100 one-day healthy rose 308 broilers were randomly divided into five groups(?,?,?,? and ? group),conventional breeding.Raised to 21-day,0,1,1.5,2,3 g/t growth hormone soluble powder were respectively added to drinking water of each group.The trial period to 42-day,all broilers were weighed weekly in the trial period,and 10 broilers were randomly selected to measure length of the tibia in each group.The results showed that:Growth hormone soluble powder hadn't significant influences on growth of the tibia in broilers,difference of average daily feed intake(ADFI)wasn,t also obvious;Growth hormone soluble powder increased average daily gain(ADG)and feed conversion rate(FCR),and differences of 2 g/t GH group were the most significant,compared with control group,ADG increased by 8.56%and FCR increased by 4.71%.The results explained the suitable additive amount of GH soluble powder in drinking water of broilers to the best advantaged was 2 g/t.In conclusion,2 g/t GH soluble powder added to drinking water of broilers has very obvious effects on promoting growth of broilers.The second experiment was ? clinical trials of GH soluble powder.One-day healthy rose 308 broilers were randomly divided into four groups(?,?,? and ? group),each group had 2 or 4 replicates,conventional breeding.Raised to 21-day,0,1,2,3 g/t growth hormone soluble powder were respectively added to drinking water of each group.The trial period to 42-day,survival rate,mean body weight,FCR of each group were calculated.The results showed that:GH soluble powder hadn't significant effects on survival rate of broilers.Besides,GH soluble powder could increase body weight and FCR of broilers,and differences of 2 g/t GH group were the most significant,compared with the control group,mean body weight increased 5.93%,FCR increased 2.42%.In conclusion,2 g/t GH soluble powder added to drinking water of broilers hasn't only significant effects on survival rate,but also growth performances are the best.The third experiment was effects of promoting broiler growth about dietary protein levels on GH soluble powder.60 one-day healthy rose 308 broilers were randomly divided into three groups(?,? and ? group),each group had 20 ones,conventional breeding.Raised to 21-day,based on the first experiment,2 g/t growth hormone soluble powder were added to drinking water of each group.?,? and ? group were fed basal,high and low levels of protein dietary respectively.Among all groups,other nutrient levels were consistent except for the protein level.The trial period to 42-day,all broilers were weighed weekly in the trial period,and 10 broilers of each group were randomly selected to measure length of the tibia in 21-day and 42-day.The results showed that:Protein levels increased or decreased 5%,GH soluble powder on promoting growth in broilers were both inhibited.The forth experiment was safety evaluation of chicken oral GH soluble powder.Method of the experiment was the same as the first experiment,all broilers were weighed weekly in 21-day and 42-day.And 5 broilers of each group were randomly collected blood to test routine blood and blood biochemistry.Besides,5 ones of each group were randomly culled,at the same time,their organs were collected and to observe if there are lesions,and organ indexes were calculated.The results showed that:all broilers for the experiment' were healthy without abnormal,and all organs hadn,t lesions.GH soluble powder could increase weight gain rate of broilers,and 2 g/t group was the highest,compared with the control group,the percentage of weight gain was 7.98%.Besides,differences of organ indexes among all groups weren't significant(P>0.05),and indexes of blood biochemistry and routine blood were all in the normal ranges.Therefore,clinical use of GH soluble powder is safety,and has important practical significance on breeding industry for broilers.