Document Type : Research Paper

Authors

1 Ph.D Candidate in Poultry Nutrition, Department of Animal Science, Faculty of Agriculture. Ilam University, Ilam-Iran

2 Department of Animal Science, Faculty of Agriculture, Ilam University, Ilam, Iran

3 Associate Prof., Department of Animal Science, Faculty of Agriculture, Ilam University, Ilam- Iran

4 Associate Prof., Department of Animal Science, Faculty of Agriculture, Tarbiat Modarres University, Tehran- Iran

5 PhD of Animal Science, Arak Branch, Islamic Azad University, Arak, Iran

Abstract

Introduction: Exposure of poultry birds to extreme temperature stressor modulates the immune responsiveness and haemato-biochemical parameters of birds. Cold temperature can increase ascites susceptibility by increasing both metabolic oxygen requirements and pulmonary hypertension. Biochar is an ash substance that is produced from the burning of biological material via pyrolysis. This study was carried out to investigate the effects of wet Litter Biochar on performance of cold-stressed broiler chickens.
Material and Methods: In this experiment, the effect of wet litter biochar (WLB), probiotic and zeolite on performance, blood metabolites and small intestine morphology of broiler chickens reared under cold stress were investigated. In a completely randomized design 350 Ross-308 broiler chickens (one-day-old, mixed sexes) were allocated to seven treatments, five replicates and 10 birds in each replicate. Experimental treatments included: 1) positive control (basal diet in recommended temperature), 2) negative control (basal diet+ cold stress), 3) negative control+ %0.5 WLB, 4) negative control+ %0.75 WLB, 5) negative control+ 1% WLB, 6) negative control+ 0.02% probiotic Ecobacto-P, and 7) negative control+ 1% zeolite. In cold stress groups, house temperature decreased to 17° C from 7 d until end of the experiment (42 d).
Results and Discussion: As compared to group reared in recommended house, cold stress significantly decreased broiler chickens feed intake, body weight gain (BWG), carcass and abdominal fat percentages, serum triglyceride concentration, activity of aspartate transaminase and alanine aminotransferase enzymes as well as villous width of jejunum and ileum while increased total and ascitic mortality, ileal and jejunal villous height and crypt depth to villous length ratio (P<0.05). Inclusion of 0.5 and 1% WLB and probiotic increased broiler chickens BWG, ileal and jejunal villous length and surface area, but decreased feed conversion ratio as compared to negative control group (P<0.05).
Conclusion: Generally, although addition of wet litter biochar and probiotic led to improvement in performance and small intestine morphometry of cold-stressed broiler chickens, but they did not completely catch-up negative effects of cold stress on broiler chickens.

Keywords

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