Nutritional Evaluation And Application Of High Protein Corn In Pigs And Broilers Diets

This paper was conducted to evaluate the nutritional value of Chinese high protein corn.poultry were used for in vivo nutritional evaluation including energy digestibility,metabolizable energy and amino acid digestibility.The effect of high protein corn on the performance of broilers and swine fed high protein corn diets was also studied. Furthermore,different experimental methods were used to study the amino acid digestibility of high protein corn in poultry.In all,the experiments included four trials.Experimental 1.18 Avain roosters were randomly divided into 3 treatments of 6 replicates each.Gross energy(GE)of high protein corn(HPC)and normal corn(NC) were 18.99 MJ/kg and 18.82 MJ/kg.AME and TME of HPC were higher than those of NC(P＞0.05).Metabolic rate of AME,TME in HPC were higher than those of NC,their values were 76.12%and 73.79%,84.92%and 82.78%,respectively(P＞0.05).These indicate that there was no significant difference in energy utilization between HPC and NC(P＞0.05).Experimental 2.Twenty four 49-day-old Avain roosters were randomly divided into 4 treatments of 6 replicates each.The N-free diet and fasting methods were used to study the amino acid digestibility of HPC and NC in poultry respectively.The results were summarized as follows:Apparent amino acid availability(AAAA)of single and total amino acids of HPC and NC were similar(P＞0.05).The true amino acid availability (TAAA)of total amino acids of HPC and NC,using the N-free or fasting method,were similar(P＞0.05).In general,the endogenous losses of total amino acids for the N-free treatment were greater(P＜0.05)than those determined using the fasting method.It indicates that there was no significant difference in the amino acid availability between HPC and NC in poultry(P＞0.05),and that differences in the endogenous losses of amino acids were observed(P＜0.05)when evaluated using the N-free or fasting method.Experimental 3.The experiment was carried out to study the effect of HPC diets on the performance of broilers.180 one-day-old Avain broilers were randomly divided into 3 treatments of 6 replicates,10 chickens in each replicate.Feeding experiment of seven weeks was carried on.The results showed as follows:(1)Each corn was fed at the same level in diets.Broilers receiving the HPC diet from 1 to 49 days of age had a better feed conversion(P＜0.05)and greater weight gains(P＞0.05)than broilers receiving the norm corn(NC)diet.(2)HPC and NC were evaluated in broiler diets formulated to be isoenergetic and isonitrogenous.There were no significant difference in average daily gain(ADG)and average daily feed intake(ADFI)and feed conversion ratio(FCR) between broilers receiving the HPC diet and receiving the NC diet(P＞0.05).Analytical data and the performance of broilers in the present study demonstrate that HPC could improve performance of broilers and has the potential to spare soybean meal or other protein supplements in broiler diets.Experimental 4.Growth trial with grower swine was conducted to compare high protein corn(HPC)and normal corn(NC)in diets.96 growing pigs(33 kg initially) were randomly divided into 3 treatments by weight,4 replicates in each treatment and 8 pigs in each replicate.Feeding experiment of 42 days was carried on.The results showed as follows:(1)Each corn was fed at the same level in diets.Pigs receiving the HPC diet had a little greater weight gains(P＞0.05)and a little better feed conversion (P＞0.05).But there were no significant difference in average daily gain(ADG)and average daily feed intake(ADFI)and feed conversion ratio(FCR)between pigs receiving the HPC diet and receiving the NC diet(P＞0.05).(2)HPC and NC were evaluated in swine diets formulated to be isoenergetic and isonitrogenous.Pigs receiving the NC diet had slightly greater weight gains(P＞0.05)and slightly better feed conversion(P＞0.05)than pigs receiving the HPC diet.But there were no significant difference in ADG and ADFI and FCR between pigs receiving the HPC diet and the NC diet(P＞0.05).The present study demonstrates that HPC has the potential to improve performance of swines and to spare soybean meal or other protein supplements in growing swines diets.