Effect of some growth promoters on growth performance of white and brown bovans chickens [electronic resource].

Includes reference.

Six hundred sexed 7days-old Bovans chicks were used in this experiment. Two experimental com- soybean meal diets were formulated with 20.5 and 18.0% crude protein (CP) and nearly isocaloric (2900 & 2800 kcal. ME/Kg diet) and fed during the growing period, respectively. Choong Ang Yeast Culture (CYC-100) which is a unique live yeast culture product (saccharomyces cerevisiae 1.51011 CFUI kg) and More Yeast (MY)which is a unique dead yeast culture (saccharomyces cerevisiae) were used as growth promoters. The objective of the present work was to study the effect of the two growth promoters on growth performance and some blood parameters during different ages in White and Brown Bovans (WB and BB) birds. It can be concluded that probiotics significantly affected BW12, BWG4 sand S.12, FC4-8 and ands.12' MY had higher BW12 and BWGs_12 than the other treatments, whereas CYC-100 had higher BWG4-8 and better FC4-8 and S.12 than the other treatments. Brown Bovans bad significantly heavier BW and BWG at all ages studied than White Bovans andshowed better FC during different periods of growth. The CYC-100 had significantly higher Hb and lower cholesterol than the other treatments being 9.67g11ooml and 168.19m9/100ml. However, the control bad significantly higher Htof 26.04% than the other treatments. The White Bovans had higher Ht and Hb than the Brown Bovans strain (22.83 and 8.38 vs 20.41 and 7.98, respectively), whereas the BB strain bad higher cholesterol content than the WB strain (150.49 vs 147.61mg/100ml). Key words: Probiotics, growth performance, White and Brown Bovans chickens.

Summary in Arabic.

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