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- Title
EFFECT OF FEED RESTRICTION ON PRODUCTIVE PERFORMANCE, CARCASS YIELD, BLOOD PICTURES AND RELATIVE ORGAN WEIGHTS OF GROWING RABBITS.
- Authors
El - Speiy, M.E.; Kamel, K.I.; El- Din, A. E. Tag; El- Hamid, A. E. Abd; EL- KAmhawey, A. ME .
- Abstract
Eighty weaning V - line rabbit's males aged 33days were used to study the effect of feeding restriction on productive performance of fattening rabbits. Rabbits were individually housed in galvanized wire cages and randomly allotted to four experimental groups (20 males per each), with initial average weight 635 ±12.25g. First rabbits group fed adlibitum commercial diet and served as control (C), second group (R1)fed restricted diet from the fifth to the sixth weeks of age (50 g /d / rabbit), third group (R2) fed restricted diet from eighth to ninth week o f age (90 g/d / rabbit) and the fourth group (R3) fed restricted diet s from fifth to the sixth weeks of age (50 g /d / rabbit) and from eighth to ninth week s of age (90 g/d / rabbit) . Rabbits fed adlibitum at all other times of experiment. At the end of the experiment (84 days of age), five rabbits from each group were slaughtered to study carcass quality and some biochemical blood parameters . Results indicated that body weight gain (BWG) for experimental restricted groups R1 and R2 (fed restricted diet for one week, short period) were statistically equal and insignificantly (P ≤ 0.05) different compared with rabbit fed ad libitum ( the control group, C) . However, restricted group R3 (fed restricted diet during the fifth to the sixth / eighth to ninth weeks (long period) recorded the lowest significant BWG compared with the other experimental groups. Feed intake and daily feed intake for R3 group recorded the lowest significantly amount of feed intake by 16.9 % compared with the control group. Moreover, feed conversion ( FCR) and mortality rate s were significantly improved for rabbit groups exposed to feed restriction. Carcass and dressing percentages were significantly lower s (P ≤ 0.05) for long period restrict ion ( R3) compared with those for control (C) and for short periods restriction (R1 and R2) . Restriction had no significant effect on white blood cells but erythrocyte count, neutrophil % and hemoglobin concentration were significantly reduced by restriction systems compared with the control group. Restrictions of diet significantly (P≤0.01) reduced total lipid, cholesterol, total proteins and urea concentrations but triglyceride and phospholipids reduced (P≤0.05) as compared with the control group. The meat content of dry matter, crude protein, ether extract (DM , CP, EE) respectively and cholesterol were significantly (P≤0.0 1 ) decreased for restricted groups. Feed restriction significantly and gradual increased color intensity and tenderness while water holding capacity was decreased linearly. In conclusion, using feed restriction for one week either at fifth or at eight weeks of growing rabbit ages could be recommended for realizing best results of growth performance and carcass.
- Subjects
RABBITS; ANIMAL nutrition; ANIMAL carcasses; HEMOGLOBINS; PHOSPHOLIPIDS; MAMMAL growth
- Publication
Egyptian Poultry Science Journal, 2015, Vol 35, Issue 2, p439
- ISSN
2090-0570
- Publication type
Article
- DOI
10.21608/epsj.2015.5372