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Response of Heat-stressed Commercial Broilers to Dietary Supplementation of Organic Chromium

Sumaiya Afrin
Lecturer
Department of Poultry Science , BAU, Mymensingh, Bangladesh

Fowzia Sultana
Professor
Department of Poultry Science, BAU, Mymensingh, Bangladesh

S. D. Chowdhury
Professor
Department of Poultry Science, BAU, Mymensingh, Bangladesh

Bibek Chandra Roy
PhD fellow
Department of Poultry Science, BAU, Mymensingh, Bangladesh

Abstract/ Executive Summary:

The responses of broilers to organic chromium (Cr) fed under heat stress were investigated. About 256 day old Cobb 500 broilers were divided into four dietary groups and fed iso-caloric and iso-nitrogenous diets containing 0, 0.005, 0.010 and 0.015% organic Cr (yeast fermented) up to 35 days. Feed intake, body weight gain and feed conversion ratio (FCR) were measured. Blood samples were collected at 22 and 34 days of age to determine serum parameters. On 35 days, 2 broilers from each replicate were slaughtered to determine carcass traits. Bodyweight and weight gain of broilers fed Cr were significantly increased at 21 and 35 days (P<0.01). Feed intake was not affected up to 21 days but increased in Cr groups (P<0.05) from 22 to 35 days. The lowest FCR was recorded for 0.010% Cr (P<0.01). A significant decrease (P<0.01) in abdominal fat were observed in Cr group. Antibody titer against Newcastle virus was increased (P<0.01) in both 0.005 and 0.010% Cr at 22 days. Heterophyl to lymphocyte ratio was decreased (P<0.01) in 0.010 and 0.015% Cr. It was therefore concluded that 0.010% dietary organic Cr supplementation may be used to improve productive performance and immune status with a reduction in abdominal fat content of broilers under heat stress conditions.

Keywords: Broilers, Heat stress, Immune response, Organic Cr, Performance

Location: In Bangladesh

Start Date:

End Date:

Program Area: Animal Health and Management

Commodity: Broiler, Farming System

Objectives:

The objectives of this study were, therefore, to evaluate the effect of dietary organic Cr (yeast fermented) on growth performance, carcass traits and some immunological parameters of broilers during heat stress.

Methodology:

Broilers and managements: A total of 256 Cobb 500 commercial one-day-old broiler chicks were randomly divided into four dietary treatment groups. Each group was replicated to four sub-groups each consisting of 16 birds. The dietary treatments consisted of a basal diet supplemented with 0 (control), 0.005, 0.010 and 0.015% organic Cr (yeast fermented, Chromisac, Zeus Biotech Limited, Mysore-570016 India ) Broilers were given a starter diet from 0 to 21 days and a grower diet from 22 to 35 days. Fresh feed and clean drinking water were supplied ad libitum and both temperature and humidity of the experimental shed were recorded four times (6 AM, 2 PM, 6 PM, 11 PM) in a day. During 4th and 5th weeks of age the temperature inside the experimental shed was 33.35 ± 2.5 and 32.1± 2.5 0C, respectively. Data collection and record keeping: The day-old chicks were weighed group-wise upon arrival and then every 7 days intervals until 35 days of age. The average live weight, weight gain, feed intake, FCR and survivability of the broilers reared on different dietary treatments were calculated. At the end of the experiment, 32 broilers, one male and one female broiler from each replication were selected, weighed and sacrificed to determine carcass traits. 2.3 Collection of blood samples for serum parameters At 22 and 34 days of age, one broiler from each replication was randomly selected chosen and blood samples were collected to determine antibody titers against Newcastle Disease virus vaccine by Haemagglutination inhibition (HI) test following the method described by Anon (1971). Blood samples were collected further when the room temperature was more than 35⁰C to determine heterophyl to lymphocyte ratio by following Different Leukocyte Count (DLC) method. Statistical analysis: All recorded and calculated variables were subjected to analysis of variance (ANOVA) in a Completely Randomized Design (CRD) by following a statistical package SAS, 2008. Duncan’s Multiple Range Test (DMRT) was used to compare treatment means.

Source of Information: IOSR Journal of Agriculture and Veterinary Science (IOSR-JAVS); e-ISSN: 2319-2380, p-ISSN: 2319-2372. Volume 9, Issue 9 Ver. I (Sep - Oct. 2016), PP 65-69

Article Link (Online Journal): DOI: 10.9790/2380-0909016569; www.iosrjournals.org

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Organic Cr (yeast fermented) may be supplemented as a potential feed additive successfully in broiler diets at 0.010 % level for increasing growth, improving immune response and decreasing abdominal fat of broilers. In future, both organic and inorganic sources of Cr and their comparison can be studied as a feed additive in broiler. Also the carcass or meat analysis should be done to find out the residual effect of these Cr sources in poultry meat.

Knowledge Management: Journal