Immunocompetence Status of White Plumage Naked Neck versus Normally Feathered Broilers in Tropical Climate

Abstract

The study was undertaken to evaluate the effect of naked neck gene on mortality, cell mediated and humoral immune response in white plumage broiler population. The mortality of homozygous naked neck (Na/Na) broilers (11.71%) was comparatively lower than that of heterozygous naked neck (Na/na) (12.28%) and normally feathered (na/na) (13.59%) broilers. The humoral immune response was measured against (1% v/v) sheep red blood cells (SRBC) for total haemagglutinin (HA) antibody, 2-mercaptoethanol resistance (MER) or (IgG) antibody and 2-mercaptoethanol sensitive (MES) or (IgM) antibody titre on 7 days post-immunization. The titre was expressed as log2 of the highest dilution which shows complete haemagglutination. Total HA titers of Na/Na and Na/na (11.05±0.53 and 11.09±0.38) were comparatively higher than that of na/na (10.26±0.42). The MES antibody titre of Na/Na (8.50±0.53) and Na/na (7.63±0.45) broilers were significantly higher as compared to na/na (6.11±0.32) broilers. The MER titre of na/na genetic group (4.15±0.42) was significantly higher than Na/Na (2.55±0.37) and comparatively higher than Na/na (3.45±0.38) broilers. In vivo cell response to phytohaemagglutinin-P (PHA-P), measured as Foot Index (FI) in mm expressed significantly higher response in Na/na (0.473±0.05) and Na/Na (0.413±0.04) broilers as compared to na/na (0.304±0.03) broilers. The result of present study suggested that white plumage naked neck broilers had better immune response as compared to normally feathered broilers.

Phenotypic Characterization of Indian Naked Neck Chicken Under Tropical Climatic Conditions

“…But HI titres to ND vaccination shows higher level for NaNa (5.10) followed by Nana and nana genotypes. Various reports (Patra et al, 2004;El-Safty et al, 2006;Fathi et al, 2005;Chatterjee et al, 2007; Galal, 2008;Rajkumar et al, 2010cRajkumar et al, , 2012b) on naked neck suggested higher humoral and CMI response in NaNa genotypes than Nana and nana ones.…”

“…Immuno-competence traits: Humoral immunity was measured as antibody response against Sheep Red Blood Cells (SRBC) at 6 weeks of age (Patra et al, 2004). Haemagglutination Activity Asian J.…”

Antibody response to goat erythrocytes in endangered Nicobari fowl, Vanaraja and their various F1 and F2 crosses under the hot humid climate of Andaman and Nicobar Islands, India

“…In the present study, natural antibodies were also found present in Nicobari fowls, Vanaraja and all their F1 and F2 crosses (Tables 1Á3). Patra et al (2004) reported that the HA titres against SRBC of homozygous and heterozygous Naked Neck were comparatively higher than normally feathered broilers in a tropical climate. The mortality percentage of homozygous Naked Neck (11.71%) was lower compared to heterozygous Naked Neck (12.28%) and normally feathered broilers (13.59%) (Patra et al 2004).…”

Naked neck and frizzle genes for improving chickens raised under high ambient temperature: II. Blood parameters and immunity

“…Similarly, El-Safty et al (2006) observed that Nana laying hens had a significantly greater dermal swelling response to PHA-P compared to normally feathered hens. In broiler breeds, Patra et al (2004) reported significantly higher CMI estimates in Nana and NaNa genotypes compared to nana. Likewise, Alvarez et al (2003) showed that Nana chickens are the most resistant to Salmonella gallinarum (SG) infection and are better responders to vaccination with SG antigens compared to NaNa and nana sibs.…”