Effect of some growth promoters on performance of White and brown bovans layers [electronic resource].

Includes references.

A total number of 570 Bovans hens was used in this experiment. Hens were classified into two equal strains (White and Brown) of 285 hens each and were divided into 3 treatments, each of 95 hens. One experimental corn- soybean meal diets was formulated. The basal diet contained 19.0% CP and 2800 Kcal. ME/Kg diet was fed during the laying period. Two types of probiotics were supplemented to the diet (2 kg/ton) to study their effects on productive performance commercial laying hens compared to the control diet (without growth promoters): 1- Choong Ang Yeast Culture (CYC-100) is a unique live yeast culture product (Saccharomyces cerevisiae 1.51Ox 1011 CFU/ kg) and 2- More Yeast (MY) is a unique dead yeast culture (Saccharomyces cerevisiae). Hens in all treatments were kept under a similar management system. The obtained results were summarized as follows: It can be concluded that Brown Bovans had significantly better feed conversion (FC) and economic of efficiency than White Bovans being 5.60 g feed/ g egg mass and 0.747 vs 7.00g feed/ g egg mass and 0.723. The MY treatment had higher economical efficiency of 0.777 than other the treatments. The White Bovans had significantly higher egg production % with lower egg weight (EW) than the Brown Bovans being 72.81% and 54.66g vs 68.80% and 55.81g, respectively. Hens fed the diets supplemented with CYC-100 and MY had higher egg production%, EW and egg mass (EM) than those fed the control diet. The highest egg production%, EW an, EM were shown during the period; from 29-32 weeks of age being 90.65%, 60.42 and 4922.05g, respectively.

Summary in Arabic.

1