The effects of dietary supplementation levels of valine on performance and immune System of broiler chickens
Journal Title: Journal of Agricultural and Crop Research - Year 2017, Vol 5, Issue 2
Abstract
The aim of this work was to evaluate the effects of adding different levels of valine in broiler diets on broiler performance, weights of immune system organs, that is, thymus, bursa of Fabricius and spleen. Also, measure the antibody titers of birds due to feeding diets containing different levels of valin for different feeding periods. Five dietary treatments groups (Control, D1, D2, D3 and D4) each containing 49 birds were arranged. The valine levels of the control group were 0.9% for 0 to 21 days and 0.82% for 21 to 42 days as recommended by NRC (1994). D1 and D2 groups were 0.9% for 0 to 21 days as recommended by NRC (1994) and 0.92 and 1.02% valine upper value of 0.1 and 0.2% recommended by NRC (1994) for 21 to 42 days. D3 and D4 groups were 1 and 1.1% valine upper value of 0.1 to 0.2% recommended by NRC (1994) for 0 to 21 days, 0.82% for 21 to 42 days as recommended by NRC (1994). Different dietary valine levels in different feeding periods did not create any statistical difference except numerical differences on performance (P > 0.05) when all study periods were taken into account. Spleen and bursa of Fabricius were not observed to be affected by various dietary valine levels (P > 0.05), but there was significant statistical difference in thymus development on either 0 to 21 days or 21 to 42 days in groups fed with ratio containing 1% valine level (P<0.05). In terms of humoral immunity, although the highest degree of vaccination antibody titers were achieved in groups fed with a ratio containing 1.1% valine level, this was not considered to be statistically significant. It is recommended as a result of this study that, the optimal value of valine in broiler ratios were evaluated to be 1% for 0 to 21 days in contrast to NRC (1994) recommendations and 0.82% for 21 to 42 days as recommended by NRC (1994).
Authors and Affiliations
Murat KAPLAN, Gültekin YILDIZ
Keywords
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