Growth, hemtological parameters and heat shock protein 70 of broilers (Gallus gallus domesticus L. ) exposed to heat stress and vitamin C supplementation

Date

5-2018

Abstract

The experiment was conducted to evaluate the effects of Vitamin C supplementation on growth, hematological parameters and heart and liver heat shock protein 70 (HSP70) among heat-stressed broiler chickens. One hundred eighty (180) straight-run Cobb broiler chicks were assigned to 3 × 2 factorial experiments with 3 replications (10 birds each) in CRD. The first factor is heat exposure (41°C; 58% RH) with TI, T2 and T3 as control, 10 min and 20 min heat exposure, respectively. The second factor is without and with vitamin C supplementation at 250 mg/kg diet.

Heat stress and supplementation of vitamin C at 250 mg/kg of diet did not significantly influence the body weight and gain (BWG), feed intake (FI) and feed conversion ratio (FCR), livability, harvest recovery, and profitability of broiler chickens for 14 days treatment period. Hematologic parameters such as, total WBC (10°), total RBC (1012), hemoglobin (Hb; g/dl), packed cell volume (PCV; %), mean corpuscular hemoglobin (MCH; pg), mean corpuscular hemoglobin concentration (MCHC; g/di) and mean corpuscular volume (MCV; femtoliters/cell) of broiler chickens shows comparable results within heat stressed and vitamin C supplemented birds. However, heat stress significantly (P<0.05) increased the percent Heterophil and Heterophil / Lymphocyte ratio (H/L) while Vitamin C supplementation significantly (P<0.05) improved the percent Heterophil, percent Lymphocyte and H/L ratio implying significant role as antibacterial defense. Likewise Vitamin C lowered heart HSP70 but not liver HSP70. Supplementation of vitamin C improved the immune status and lowered HSP70 response in heat- challenged birds. In summary, Vitamin C does not help improve broiler production performance. However, it is implied that Vitamin C helps in mitigating heat stress by improving the immune and cardiovascular function as indicated by increased Lymphocyte (P<0.05) and decreased Heterophil (P<0.05) and lowered heart HSP (P<0.05), respectively.

Document Type

Dissertation

Degree

Doctor of Philosophy in Animal Science

College

College of Agriculture and Food Science (CAFS)

Adviser/Committee Chair

Renato S.A. Vega

Committee Member

Carmelita M. Rebancos, Agapita J. Salces, Clarita T. Dagaas

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

En – AGROVOC descriptors

GALLUS GALLUS; GROWTH; BLOOD DISORDERS; HEAT STRESS; ASCORBIC ACID; SUPPLEMENTS

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