CARCASS CHARACTERISTICS AND SOME BIOCHEMICAL VARIABLES IN BROILER CHICKS AS AFFECTED BY AN INITIAL FEED RESTRICTION AND SUBSEQUENT EFEEDING | ||||
| Journal of Animal and Poultry Production | ||||
| Article 9, Volume 30, Issue 6, June 2005, Page 3099-3110 PDF (526.37 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2005.237999 | ||||
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| Authors | ||||
| M. M. A. EI-Moniary,; Eman F. EI-Daly | ||||
| Dept. Animal Production, National Research Centre, Dokki, Cairo,Egypt. | ||||
| Abstract | ||||
| A total number of 72 unsexed one-day-old broiler chicks were divided equally into four groups {each of 18 chicks) and fed the starter recommended diet {1} during the first week of age. Then , from 14 to 21 days of age , birds where allocated to three tested energy-protein restriction diets representing 90%. 80% or 70% of starter requirements (groups 2 ,3 and 4 ), compared to those ted 100% of the starter requirements (control). Then, birds were switched again to the control starter diet [1). All birds were fed grower and finisher diets from 22 to 37 and from 38 to 49 days of age. respectively. Body weight, carcass characteristics. carcass analysis and serum biochemical variables were taken at the end of experimental period (49 days of age}. Results obtained can be abstracted as follow: 1-Body weight, relative weight values of carcass, liver, gizzard. kidney and heart did not significantly affected by levels of energy-protein restriction used in the current study. 2-Abdominal fat percentage was destined gradually and significantly (P<0.05) as feed restriction levei increased. 3-Commercial carcass cuts {breast and thigh muscles) yielded a higher (P >005) percentage distribution for breast portion and less (P>0.05) percentage distribution for thighs than the control group. 4-Dry matter and ash content were nearly similar in all groups, while protein content insignificantly increased with increasing energy-protein restriction levels. However, ether extract of control group recorded the highest value compared to the others. 5-Serum total protein, albumin, globulin and uric acid content exhibited insignificant values in treatment groups. B-Total cholesterol, triglycerides, HDL and LDL levels in restricted feed broilers were concomitant with those of body fat content and abdominal fat. 7-Semm glucose, T3 and T4 levels were insignificantly fluctuating in broilers fed different feed restriction regimes. It could be suggested that the effect of feed restriction in broilers at an early age is more evident in lipid metabolism rather than protein metabolism, to obtain a better understanding of their nutritionai and physiological responses. | ||||
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