Effect of ascorbic acid on productive performance, red blood cell parameters and heterophil: Lymphocyte ratio in broilers under chronic heat stress
2004
Worapol Aengwanich(Mahasarakham University, Maha Sarakham (Thailand). Faculuty of Technology. Dept. of Agricultural Technology. Division of Animal Production Technology) | Orawan Chinrasri(Mahasarakham University, Maha Sarakham (Thailand). Faculuty of Technology. Dept. of Agricultural Technology. Division of Animal Production Technology)
Objective of this study was to conduct an experiment on the effect of ascorbic acid on productive performance and hematological parameters in broilers reared in an environmental temperature of 33+-1 deg C and supplementary ascorbic acid at 4 levels i.e. 0,200,400 and 800 mg/kg. The parameter was measured on days 1,7,14 and 21 of the experiment. The results showed that ascorbic acid had no effect on Feed intake (FI), average daily gain (ADG), feed conversion ratio (FCR), mortality rate (MR) and red cell parameters of broilers under chronic heat stress. Whereas, ascorbic at 200 mg/kg in the diet did decrease the heterophil: lymphocyte (H : L) ratio. Total red blood cell (TRBC) was significantly decreased by day 7 but then increased to the normal range on day 21 (p LT 0.05). Hemoglobin concentration (Hb) was significantly decreased by day 3 and increased to a normal range on day 21 (p LT 0.05). Packed cell volume (PCV) of chickens were significantly decreased on days 7 and 14, then increased to the normal range on day 21 (p LT 0.05). Mean corpuscular volume (MCV) was significantly increased on day 3 then decreased to the normal range on day 14 (p LT 0.05). Mean corpuscular hemoglobin (MCH) was significantly decreased on day 14, then increased to the normal range on day 21 (p LT 0.05). Mean corpuscular hemoglobin concentration (MCHC) was significantly decreased on day 3 , then increased to the normal range on day 14 (p LT 0.05). H:L ratio was significantly increased on day 3 , then decreased to the normal range on day 7. The H:L ratio on days 14 and 21 was significantly lower than on day 1 (p LT 0.05). Ascorbic acid had no affect on FI, ADG, FCR, MR, red blood cell parameters, but could help birds resist heat stress. Broilers that were reared in chronic high environment temperatures could adapt to this stress.
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