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Effects of brown seaweed products on growth performance, blood biochemistry, immune response broiler chickens challenged with heat stress

2022 CPRF,Broilers
Dietary supplementation of natural antioxidants in poultry has been recognized to be effective in combating the negative outcomes of heat stress (HS). Brown seaweed (Ascophyllum nodosum) is known for its excellent antioxidant ability, but its impact on the growth performance and health of broiler chickens challenged with HS has not been fully elucidated. Given the potential benefits of seaweed, the current study was conducted to determine the efficacy of brown seaweed meal (SWM) and extract (SWE) on growth performance, blood biochemistry, immunoglobulins (IgG and IgM), and antioxidant capacity of broiler chickens challenged with HS. A total of 336 one-day-old broiler chicks were divided equally into two rooms: 1) Thermoneutral room (TN; 24oC ± 1 on d 21-27) and 2) Heat stress room (HS; 32-34 oC for 8 hr./day on d 21-27). In each room, birds were randomly allotted to four dietary treatments: 1) Negative control (NC; corn-wheat-soybean based diet), 2) NC + 1 ml SWE in drinking water, 3) NC + 2 ml SWE in drinking water, and 4) NC + 2% SWM in feed. Each treatment consisted of six replicate cages and each cage housed 7 birds. Rectal temperature of two birds per replicate was measured using digital thermometer to confirm induced HS on day 27. On day 28, two male birds/cage were euthanized to collect blood and immune organs for subsequent blood biochemical, antioxidant, and immune status analysis. Data were analyzed as a 4 × 2 factorial analysis of variance (ANOVA) using General Linear Model of Minitab LLC, (2019) software. 2% SWM inclusion significantly increased (P < 0.05) the body weight gain at the early phase (week 1), late phase (week 4), and at the end of the trial period. HS significantly reduced (P < 0.05) feed intake compared to TN birds. However, the body weight gain of heat-stressed birds was not different from the TN birds. HS furthered increased (P < 0.05) the bird’s rectal temperature, plasma concentrations of sodium, chloride, glucose, amylase, and uric acid but it reduced urea and creatine kinase concentrations. Heat stress increased (P < 0.05) IgM and IgG concentrations compared to TN birds, while the activity of superoxide dismutase was not affected by HS and dietary treatments. There was a significant interaction (P < 0.05) between dietary treatments and HS on plasma lipase and alanine aminotransferase (ALT). Lipase concentration reduced in heat-stressed birds fed with 2% SWM compared to other treatments. The plasma activity of ALT decreased in heat-stressed broilers that received 1ml SWE in drinking water compared to those fed with 2% SWM. Brown seaweed treatment and HS did not affect the relative weight of immune organs (bursa and spleen). Our results indicate that HS reduced feed intake and affected blood biochemical parameters and immunoglobulins, while dietary supplementation of brown seaweed products improved growth performance of birds irrespective of HS and potentially mitigated the negative effects of HS by improving the plasma enzyme activities of heat-stressed birds.
Tags :
blood chemistry,heat stress,seaweed
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Presenter

PhD Candidate

Dalhousie University

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