Small Intestine Microvilli Status, Immune System and Broilers Chickens Performance in Response to Threonine Requirement
Year: 2025
Type: article
Abstract: This study was conducted to determine different levels of threonine on intestinal microvilli morphology, humoral immunity, carcass content and performance in broiler chickens. A total of 272 day-old broiler chickens (Ross 308) with 4 treatments, 4 replicates and 17 birds in each were arranged in completely ran-dom design (CRD). Treatments were included 4 levels of starter, grower and finisher threonine in diets (0.96, 0.91, 0.86, 0.81); (0.87, 0.82, 0.77, 0.72); (0.78, 0.73, 0.68, 0.63%) respectively. At the end of the experiment, intestinal morphology, performance and blood parameters were measured. The results showed that the primary immune response against red blood cells was reduced (P<0.05) by decreased dietary threonine levels, in contrast, the amount of IgG and total antibody were increased with increasing levels of dietary threonine, (P<0.05). Increased threonine levels at 42 days of age resulted in higher lymphocyte counts and an elevated heterophil-to-lymphocyte ratio (P<0.05). Increased villus length, crypt depth, and villus length to crypt depth ratio were indicated by the high levels of threonine in the diet (P<0.05). The numbers and height of microvilli were reduced by decreasing threonine levels. In general, it can be con-cluded that increasing the level of threonine in the diet improved intestinal condition, which in turn could improve performance.
Authors: Agha Basiri Sarabi, M., Saki, A.A., Jahanian Najafabadi, H., Ahmadi, A., Bardel, Z.
Institution: Bu-Ali Sina University
Language: English
Subfield: Animal Science and Zoology
Domain: Life Sciences
Open Access status: diamond
OpenAlex ID: W7116771697
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