Research progress of methionine chelated zinc in animal husbandry
1.Application of amino acid chelate in animal husbandry
methionine is usually the first limiting amino acid for poultry. The main form of zinc absorption by the body is the chelate formed by amino acids and zinc. The bioavailability of metal elements in chelates is higher than that of inorganic metal elements, and there is no pollution. The application of amino acid chelated zinc in poultry can not only make poultry well absorb and utilize trace elements zinc and methionine, but also improve poultry weight gain, breast meat yield and feed utilization; improve egg production rate, egg shell quality, breeding poultry fertilization rate, hatching rate; enhance immunity.
Lu Guanglin studied the effect of methionine chelated zinc on the immune organ index and blood index of mallard duck and the optimal dosage. The control group was supplemented with 150 mg/kg zinc sulfate; the treatment group I was supplemented with 75 mg/kg zinc sulfate + 150 mg/kg methionine chelated zinc; the treatment group II was supplemented with 300 mg/kg methionine chelated zinc. The test results were as follows: the content of urea nitrogen in treatment groups I and II was significantly lower than that in the control group; compared with the control group, the thymus index increased by 1.42% and 4.62%, the supraluminal sac index increased by 8.92% and 7.01%, and the spleen index increased by 8.92% and 7.01%, respectively. improved by 6.12% and 9.87%. It shows that methionine chelated zinc can improve the protein metabolism level of mallard duck, improve the immune organ index and enhance immunity more than zinc sulfate. Xue Huiming's research also proved that the methionine chelated zinc group gained significantly more weight than the zinc sulfate group, and the apparent protein metabolism rate was higher.
Zhou Junhua used Guangxi's excellent local chicken Liangfenghua broiler as material, and added different doses of methionine chelated zinc to its diet. The results showed that methionine chelated zinc had an effect on the growth performance, slaughter performance and apparent digestion of feed nutrients of Liangfenghua broiler. The metabolic rate has a certain promoting effect, and it is feasible to add methionine chelated zinc to reduce the dietary protein level. Li Wanjun studied the effect of methionine chelated zinc instead of zinc sulfate on broiler chickens. The results show that adding methionine chelated zinc to replace zinc sulfate in broiler diets can improve the production performance of broilers and reduce the incidence and mortality of leg disease. After economic analysis, adding methionine chelated zinc at a level of 20 mg/kg zinc in the diet best effect. Li Wanjun also proved that methionine chelated zinc instead of zinc sulfate can improve the egg production performance of laying hens. Deng Zaofu's research shows that methionine chelate instead of inorganic salt can significantly improve the growth rate and feed conversion rate of broiler chickens, and improve the economic benefits of breeding; the addition of methionine chelated zinc in the diet of broiler chickens is added per kilogram of feed. 60mg works best.
2. Many studies on pigs
have confirmed that amino acid chelated zinc is easier to be effectively utilized by piglets due to its anti-interference and unique absorption method, which can increase the daily weight gain of piglets, improve feed conversion rate, reduce piglet diarrhea rate, and enhance body immunity. At the same time, it can also increase the daily gain of growing and fattening pigs, reduce the feed-to-meat ratio, and improve the litter size, piglet survival rate and weaning piglet quality of sows.
Fang Jun designed 4 treatment groups, respectively feeding zinc oxide 3000 mg/kg zinc, methionine chelated zinc 350 mg/kg zinc, zinc oxide 60 mg/kg zinc + methionine chelated zinc 40 mg/kg zinc, and zinc oxide 100 mg/kg. mg/kg zinc diet, the results showed that the zinc methionine treatment group, the high zinc treatment group and the mixed zinc treatment group had higher daily weight gain, daily feed intake and feed conversion rate than the normal zinc treatment group. There was no significant difference in daily weight gain, daily feed intake, feed efficiency and incidence of diarrhea between zinc methionine treatment group and high zinc treatment group. Ju Jiguang added zinc hydroxymethionine 30 mg/kg to replace inorganic salts in growing-finishing pig diets. The results showed that methionine chelated zinc could significantly increase the growth rate of growing-finishing pigs, which was 8.3% higher than that of the control group, decreased the feed-to-meat ratio by 13.7%, and improved the feed conversion rate. Hoover added zinc methionine to the sow diet, and the conception rate of primiparous sows increased by 7.2% on average, the number of live-born piglets increased by 0.37 on average, the stillbirth rate of primiparous was decreased by 2.1% on average, and the survival rate of weaned piglets increased by 2.9% on average.
3. The methionine chelated zinc of ruminants
has good stability in the rumen, and its biological utilization rate is obviously higher than that of inorganic zinc, which can well meet the demand of ruminants for zinc.
Wu Zhiguang added 100, 250, and 400 mg/kg of zinc methionine to the basal diet of early lactating and multi-producing dairy cows containing 34.63 mg/kg of zinc, respectively. The results showed that the apparent digestibility of each nutrient component of dairy cows increased in different degrees, and the milk yield increased by 5.28%, 7.9% and 7.2% respectively, and the content of milk protein was increased to a certain extent without affecting the content of milk fat and lactose. Zinc content is significantly increased, and methionine chelated zinc effectively improves dairy quality and the health of lactating cows. Liu Hui added quantitative zinc methionine to dairy cows' diets. The results showed that adding only 4 g of zinc methionine per day to the basal diet of dairy cows can effectively increase the milk production of dairy cows, reduce the number of somatic cells, and reduce the occurrence of mastitis and foot and foot disease.
zinc is widely distributed in animal and plant feed raw materials, and it is difficult for fish to develop zinc deficiency. However, supplementing with an appropriate dose of zinc can allow fish to achieve optimal growth and physiological state.
Cao Chunyan used hydroxymethionine chelated zinc (MHA-Zn) as the zinc source when the basal feed contained 12.8 mg/kg of background zinc, and the supplemental amounts of zinc were 50.5, 33.9, and 23.2 mg/kg, respectively. , serum SOD and vertebral zinc deposition reached the maximum value, and when ZnSO4?7H2O was used as the zinc source and the zinc supplementation amount was 34.2, 38.6 and more than 65.6 mg/kg, respectively, the carp WGR, serum SOD and vertebral zinc deposition reached the maximum value. . The results show that MHA-Zn is a more effective organozinc than zinc sulfate. Judging from the growth performance indicators, serum biochemical indicators, antioxidant indicators, and tissue zinc deposition indicators, carp can tolerate high doses of MHA-Zn, which not only does not affect their growth performance and serum biochemical indicators, but can increase zinc deposition in tissues. and antioxidant properties.
2. Looking ahead
In summary, methionine chelated zinc is obviously superior to other inorganic zincs in many aspects, such as bioavailability, reducing environmental pollution, feed conversion rate, improving animal production performance, strengthening animal immunity, and improving disease resistance. source. It can be seen that methionine acid chelated zinc has obvious effect in animal husbandry, and has quite extensive utilization value and broad application prospect. However, there are still some problems in the current research on methionine chelated zinc, and further research is needed, such as the specific absorption and metabolism mechanism of amino acid chelated zinc in animals is still unclear, and the specific and appropriate addition amount in feed is not uniform. While strengthening its further in-depth research, it is necessary to continuously improve the production process, reduce production costs, and produce high-quality and cheap products to strengthen its popularization and application and promote the development of animal husbandry.