EFFECT OF FEEDING LEVEL AND DIETARY SUPPLEMENTATION OF DRY BEAKER’S YEAST ON PRODUCTIVITY OF GROWING FRIESIAN CALVES | ||||
Journal of Animal and Poultry Production | ||||
Article 1, Volume 33, Issue 12, December 2008, Page 8433-8446 PDF (798.44 K) | ||||
Document Type: Original Article | ||||
DOI: 10.21608/jappmu.2008.218971 | ||||
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Authors | ||||
M. A. M. Abu El-Hamd,1; A. M. Ashour2; A. F. Mehrez1; E. Ragheb1; M. A. SHERIF1 | ||||
1Animal Production Research Institute, Agricultural Research Center, Egypt. | ||||
2Department of Animal Production, Faculty of Agriculture, Al-Azhar University, Egypt. | ||||
Abstract | ||||
To evaluate the effect of feeding level and dietary supplementation of dried Baker’s yeast (DBY) on the performanceof Friesian growing calves, total of 36 calves with average body weight of 160±2.34 kg and 9.47±0.30 mo of age were assigned randomly into three feeding level groups 80, 100 and 120% of NRC (1989), 12 animals in each. Each feeding level group was further divided into two equal subgroups, one without dietary supplementation (control) and another group supplemented with 10 g DBY/h/d. 6 animals in each. Feeding level lasted for ????. Results show during the summer or winter feeding, calves fed 80% with DBY showed the highest (P<0.05) digestibility coefficients for most nutrients, while the lowest values were almost obtained for those fed 120% without DBY diet. Live body weight (LBW) of calves was the highest (P<0.05) with 120% feeding level plus DBY, while the lowest LBW were recorded with 80% without DBY. Average daily gain (ADG) increased (P<0.05) by increasing feeding level from 100 to 120%. However, DBY supplementation improved (P<0.05) ADG only with feeding level of 80%. The best feed efficiency was recorded (P<0.05) for calves fed 80% with DBY, while those fed 80 or 100% without DBY showed the poorest (P<0.05) feed efficiency. Feeding level showed marked (P<0.05) effect on pH values, and concentrations of total volatile fatty acids (TVFA) and NH3-N in RL during summer and winter feeding. However, the effect of DBY supplementation was more pronounced (P<0.05) TVFA concentrations in RL during summer and winter feeding. Total protein and globulin concentrations in blood plasma increased (P<0.05) by increasing feeding level. However, DBY supplementation increased (P<0.05) total protein concentration only with 80% feeding level. Overall concentration of T4 in blood plasma increased (P<0.05) feeding level up to 120%, and was not affected by DBY supplementation. According to this study growing Friesian calves fed 80% with DBY showed the highest feed efficiency from the nutritional and economical points of view. | ||||
Keywords | ||||
Calves; feeding level; dry Baker’s yeast; growth performance | ||||
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