M. A. Tony1, Wafaa A. Abd El-Ghany2 and Samah H. Mohamed3

1Department of Nutrition and Clinical Nutrition, Faculty of Veterinary Medicine, Cairo

University2Department of Poultry Diseases, Faculty of Veterinary Medicine, Cairo University

3Department of Immunology, Animal Health Research Institute, Dokki, Egypt

Influence of feed sanitation on zootechnical performance, immune status and prevalence of Salmonella

typhimurium in broiler chickens

Introduction

Introduction

• Study and compare the efficacy of a commercial acidifier feed additive product containing formaldehyde (Dexanifeed®) at two doses (250g/ton and 500g/ton) on zootechnical performance, Salmonella Typhimurium prevalence, immune status and carcass yield of broiler chickens.

The aim of the work

Experimental design

Measured parameters

Parameters Control Group

(C)

Dexanifeed® treated Groups

T1 (250 g/ton feed)

T2 (500 g/ton feed)

Body weight (g/bird)

Body weight gain (g/bird)

Feed Intake (g/bird)

FCR

1985 ± 65.5a

1945 ± 41.5a

3425.5 ± 25.5a

1.76

2000.5 ± 25.3b

1960.5 ± 20.5b

3435.5 ± 20.9a

1.75

2110.3 ± 18.5c

2070.3 ± 22.5c

3478.5 ± 15.9a

1.68

Performance parameters measured at day 35 of age (mean ± SD)

Figures in the same row with different letters are statistically significantly different (p<0.05

Performance Parameters

Shedding rate of S. Typhimurium

R-isolation rate of S. Typhimurium

*

*

* *

5

6

7

8

9

10

21day 28day 35day

Antib

ody ti

ters

( log

2)

Age

C T1 T2 C T1 T2 C T1 T2

HI titers of NDV

* Significant difference

ELISA optical densities (OD) of IBDV

* Significant difference

Phagocytic percent of macrophages

Nitric oxid (μmol/ml)

Parameters Control Group(C)

Dexanifeed® treated Groups

T1 (250 g/ton feed)

T2 (500 g/ton feed)

Live Body weight (g)

Dressing weight (g)

Dressing weight (%)

Liver weight (g)

Abdominal fat (g)

1990 ± 15.3a

1462.60 ± 22.5a

73.5

48.6 ± 2.5a

10.80 ± 3.8a

2010.5 ± 33.5b

1471.70 ± 18.9b

73.2

48.7 ± 3.2a

10.52 ± 2.8a

2130.5 ± 26.2c

1559.52 ± 21.3c

73.2

48.6 ± 3.1a

10.65 ± 2.9a

Carcass yield measured at day 35 of age (mean ± SD)

Figures in the same row with different letters are statistically significantly different (p<0.05).

• Using organic acids with their salts and formaldehyde mixture (Dexanifeed®) as feed additives for feed sanitation reflected positively on the productive performance of broiler chickens, reduced the incidence of salmonellosis and enhanced the immune status of broiler chickens.

Conclusion