THE USE OF POLYBACTERIAL IMMUNOSTIMULATOR (NATSTIM PLUS) IN BREEDING OF LAYING HENS I. PERFORMANCE, MORPHOLOGICAL AND INCUBATION CHARACTERISTICS OF EGGS

Dimitar Chotinsky, Dimitar Belorechkov, Gyurga Mihailova, Evgeny Petkov, Ivan Denev

Abstract: An experiment was carried out with 180 laying hens and 24 cocks Hy Line divided in two groups. The birds from the experimental group received for 30 days water supplemented by 0.4 mg per kg body weight polybacterial immunostimulator. The performance of hens along the inclusion of immunostimulator in the water decreased with 0.44% , but after that increased with 2.1% and total for two periods remains with 1.72% higher at the experimental group. Egg weight along the inclusion of immunostimulator in the water increased with 0.46 g in the experimental group, but after that increased with 1.72 g and total for two periods with 0.92g. The supplementation of polybacterial immunostimulator in the water of laying hens did not change significantly the form index, yolk index, shell weight, shell thickness and yolk colour. Index of protein increased with 3.23% and Haugh units with 1.23 %, but yolk weight decreased with 0.31 g. The supplementation of polybacterial immunostimulator in the water did not change significantly the hatchability of incubated and fertilized eggs.

Keywords: chickens; egg quality; eggs; incubation; laying hens; Natstim plus

Date published: 2023-03-01