Effect Of Methionine On Growth,Meat Quality,Antioxidant Properties And Immune Function Of Phasianus Colchicus

With the development of animal husbandry,the lack of feed raw materials was becoming more and more serious,and now we need to find a solution to solve the problem.There were studies had shown that we can reduce the demand for crude protein feed in livestock production by adding the appropriate amount of amino acids and reducing the level of protein.Pheasant chicken which has high protein and low fat is tasted delicious and it is high quality meat.The research of methionine in feed on the pheasant was rarely reported at home and abroad.Total two hundred healthy pheasants at 29-days old with similar body weight were randomly divided into five treatment groups with 5 replicates of 8 pheasants.The group A was positive control group,pheasants of group A was fed with NRC(1994)standard recommended diet.Group B was negative control group,pheasants of group B were fed low protein diet whose crude protein level was lower 3% than group A.Other treatments received diets supplemented with 0.1%,0.2%,0.3% of DLM,respectively.The pheasants were fed for 28 days(29d-56d).The results showed that the average daily gain of pheasant in the group E was significantly increased in the second week(P<0.05).The average daily gain of pheasant in the group D and group E was significantly increased in the third week,fourth week and all the rearing period(P<0.05).The ADF of pheasants in group D and group E was significantly decreased in the third week(P<0.05).The FCR of pheasant in experimental groups was significantly decreased(P<0.05).The eviscerated rate of the group C,group D and group E were significantly higher than the group B(P<0.05).Pheasants’ breast muscle rate,leg muscle rate,lean meat rate of group D and group E were significantly higher than group B(P<0.05).The breast and leg muscle protein content of pheasant in the group C,group D and group E were significantly higher than that of the group B(P<0.05).The crude fat content in pheasants’ breast muscle of the group D and group E were significantly lower than those in the group B(P<0.05).The crude fat content in pheasants’ leg muscle of the group C,group D and group E was significantly lower than that in the group B(P<0.05).Methionine significantly increased the total antioxidant activity(T-AOC)of pheasant’s serum and liver of the group C,group D and group E(P<0.01).The levels of superoxide dismutase(SOD)and glutathione peroxidase(GSH-Px)in serum and liver of the group C,group D and group E were significantly increased(P<0.05).The concentration of malondialdehyde(MDA)in serum and liver of the group C,group D and group E were significantly decreased(P<0.05).The concentration of hydroxyl radicals in serum and liver of the group C,group D and group E were significantly decreased(P<0.01).The contents of total protein and globulin in serum of the group C,group D and group E were significantly improved(P<0.05).The thymus index of pheasant in the group C,group D and group E was significantly increased(P<0.05).In summary,the addition of an appropriate amount of methionine in the lowprotein diet can improve the body weight of the pheasant and reduce the feed ratio of the pheasant and improve the feed utilization rate.The addition of the appropriate amount of methionine in the low-protein diet can significantly improve the breast muscle rate,the leg muscle rate and the fine meat rate of the pheasant,and improving the slaughter performance of the pheasant.Methionine can improve the content of crude protein in breast and leg muscle,reduce the content of crude fat in chest muscle and leg muscle,and improve the nutritional value of pheasant meat.Methionine can significantly improve the antioxidant capacity of pheasant serum and liver.Methionine can significantly increase the total protein and globulin content in pheasant serum,increase the pheasant thymus index,and improve the immune performance of pheasant.The recommended addition is 0.3%(on the basis of NRC).