EFFECTS OF LATE FEED RESTRICTION ON GROWTH PERFORMANCE AND INTESTINAL VILLI PARAMETERS OF BROILER CHICKS UNDER SUMMER CONDITIONS | ||||
| Egyptian Poultry Science Journal | ||||
| Article 13, Volume 39, Issue 4, December 2019, Page 913-934 PDF (729.72 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/epsj.2019.67514 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| Hesham Mahmoud Azouz | ||||
| Animal productin reseash institute | ||||
| Abstract | ||||
| The aim of that study was to investigate the effects of late feed restriction at finisher stage or 12 hours feed withdrawal combined with feed restriction (FR) on growth performance, carcass traits,intestinal villi histo-morphometry and economic efficiency in chicks reared under summer conditions for 42 days were evaluated. A total number of 240 unsexed one day-old Ross 308 broiler chickens were randomly allocated to eight dietary treatments. Chickens fed ad libitum during starter and grower stage, after that two feeding regimes were applied during finisher stage (29 – 42 d); the first regime were providing feed ad libitum, 90 %, 80 % and 70 % of ad libitum feed for treatments T1 (control), T2, T3 and T4, respectively, the second compromised 12 hours feed withdrawal (fasting) associated with FR which T5 (100 %), T6 (90 %), T7 (80 %) and T8 (70 %). Live body weight did not differ significantly at 2 and 4 week of age or at final live body weight.LBW and BWG at 4 – 6 week of age of broilers subjected to 12 hours feed withdrawal comes before late feed restriction (100, 90, 80 and 70 %) were greater than the counterpart treatments.There were significant differences in feed intake and FCR during finisher period and the entire the experimental period between chicks given restricted diets and the control. Significant differences were recorded in the percentage of carcass, total edible parts and abdominal fat. An inverse relationship was seen between FR and abdominal fat deposition. There were no mortalities during experimental periods. Restricted fed groups scored highest villus and depth crypts and the lower production cost. It can be concluded that birds fed onrestricted diets (70 %) and feed withdrawal 12 hours before feed restriction at finisher period gave thebest FCR and less expensive in production. | ||||
| Keywords | ||||
| broiler; feed restriction; Growth performance; carcass; villus and crypts | ||||
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