EFFECT OF SOME GROWTH PROMOTERS ON PERFORMANCE OF WHITE AND BROWN BOVANS LAYERS | ||||
| Fayoum Journal of Agricultural Research and Development | ||||
| Article 16, Volume 22, Issue 2, July 2008, Page 246-275 PDF (469.26 K) | ||||
| Document Type: Research articles. | ||||
| DOI: 10.21608/fjard.2008.197502 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| M. S. Bahnas; M. A. Mousa; M. A. Khalifa | ||||
| Poult. Prod. Dept., Fac. Agric., Fayoum Univ., Egypt | ||||
| Abstract | ||||
| 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. | ||||
| Keywords | ||||
| Probiotics; layer performance; White and Brown Bovans hens | ||||
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