ArticleVeterinary medicine and science2026
Effects of Different Levels of Methionine in Liquid and Powder Forms on Growth Performance, Blood Parameters, and Carcass Traits of Broiler Chickens.
Article in Veterinary medicine and science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Methionine is a key limiting amino acid in poultry nutrition and plays an essential role in growth, metabolism, and antioxidant defence. This study aimed to evaluate the effects of different sources and combinations of methionine on performance, carcass traits, intestinal morphology, and blood biochemical parameters in broiler chickens. A total of 300 one-day-old male broiler chicks were randomly assigned to six dietary treatments with five replicates of 10 birds each. The treatments included a control diet without methionine (60-MET), 100% powder methionine (CONT), 100% liquid methionine (100-LM), and three combinations of powder and liquid methionine (50-LPM, 25-LPM, and 75-LPM). Body weight gain and feed conversion ratio were significantly improved in all methionine-supplemented groups, particularly in 100-LM and 50-LPM (p < 0.05) compared with the 60-MET group. Carcass yield did not differ significantly, but thigh and breast percentages increased in supplemented groups (p = 0.003 and p = 0.001, respectively) compared with the 60-MET group. Intestinal morphology analysis showed a significant increase in villus height with methionine supplementation (p = 0.001), while crypt depth and muscular thickness remained unchanged. Blood biochemical analysis showed that methionine supplementation significantly reduced serum urea, uric acid, AST, ALT, and MDA levels (p < 0.05), while increasing albumin, total protein, and total antioxidant capacity (p < 0.05) compared with the 60-MET group. In conclusion, both powder and liquid methionine sources, especially in the 100-LM and 50-LPM treatments, had positive effects on performance, gut morphology, and physiological health in broilers, indicating the efficiency of liquid form.
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