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 1.510x1011 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 and EM were shown during the period from 29-32 weeks of age being 90.65%, 60.42 and 4922.05g, respectively. White Bovans had significantly higher haematocrit value (Ht %) and haemoglobin value (g/dl) than the Brown Bovans (25.76% and 9.64g/100ml vs 24.30% and 9.05g/100ml, P≤0.05). Hens fed the MY supplemented diets had lower Ht% and Hb of 24.19% and 8.87g/100ml than the other treatments. Diets supplemented with both CYC-100 and MY\ had lower cholesterol content than those fed the control diet. It can be seen that as birds advanced in age and production, both Ht% and Hb gradually increased. The period from 21-24 weeks of age had the lowest Ht, Hb and cholesterol estimates of 21.55% 8.13g/100ml and 149.05mg/dl.
Bahnas, M. S., Mousa, M. A., & Khalifa, M. A. (2008). EFFECT OF SOME GROWTH PROMOTERS ON PERFORMANCE OF WHITE AND BROWN BOVANS LAYERS. Fayoum Journal of Agricultural Research and Development, 22(2), 246-275. doi: 10.21608/fjard.2008.197502
MLA
M. S. Bahnas; M. A. Mousa; M. A. Khalifa. "EFFECT OF SOME GROWTH PROMOTERS ON PERFORMANCE OF WHITE AND BROWN BOVANS LAYERS", Fayoum Journal of Agricultural Research and Development, 22, 2, 2008, 246-275. doi: 10.21608/fjard.2008.197502
HARVARD
Bahnas, M. S., Mousa, M. A., Khalifa, M. A. (2008). 'EFFECT OF SOME GROWTH PROMOTERS ON PERFORMANCE OF WHITE AND BROWN BOVANS LAYERS', Fayoum Journal of Agricultural Research and Development, 22(2), pp. 246-275. doi: 10.21608/fjard.2008.197502
VANCOUVER
Bahnas, M. S., Mousa, M. A., Khalifa, M. A. EFFECT OF SOME GROWTH PROMOTERS ON PERFORMANCE OF WHITE AND BROWN BOVANS LAYERS. Fayoum Journal of Agricultural Research and Development, 2008; 22(2): 246-275. doi: 10.21608/fjard.2008.197502
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