EFFECT OF CERTAIN FEED ALLOWANCES DURING REARING PERIOD ON THE PERFORMANCE OF GIMMIZAH AND GOLDEN MONTAZAH PULLETS | ||||
| Journal of Animal and Poultry Production | ||||
| Article 2, Volume 27, Issue 7, July 2002, Page 4419-4435 PDF (1.84 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2002.255734 | ||||
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| Authors | ||||
| Yousria K. Afify,; Nazla Y. Abou-EI-Ella; Mervat A. Breikaa; Magda M. Balat | ||||
| Animal Production Research Institute, Agricultural Research Center, Ministry of Agriculture, Cairo, Egypt | ||||
| Abstract | ||||
| Two hundred and twelve Gimmizah (G) and Golden Montazah (GM) female chicks. at 4 weeks of age were used. Four groups of about (26-27) chicks from each strain were kept on floor pens and fed a growing diet from 4 to 20 weeks of age. The chicks were assigned randomly to one of the following treatments: the control group which was fed ad libitum, the +8% group, which was fed 8% diet above that ofthe control consumption during a week before, and the -8% and -16% groups, which were fed 8% and 16%, respectively, less feed than that of the control consumption during a week before. These treatments were applied up to 20 weeks of age, then, laying diet was provided instead of the growing one and the same amount of food was allocated to birds of all treatments till the end of the experimental interval. Water was available for ad libitum intake throughout the study. The G strain was significantly (P<0.001) heavier than GM at all studied ages, and food allocation treatment affected BW (P<O.OS) at 8 weeks and (P<O.001) at the other ages studied. However, the hens which received the increased food allocation surpassed the control, -8% and -16% groups in a descending order up to 20 wks of age. While GM birds grew significantly (P<O.OS) faster than G from 8-12 and from 12-16 weeks, the control group or hens which received the increased food allocation surpassed the -8% and -16% groups. The G birds had significantly better values of feed conversion (FeR) at 4-8 and 16-20 weeks of age. On the averages, the hens of ·16%, -8% food allowancing showed significantly the best values of FeR at 12·16 weeks, followed by those with increased food allowancing +8% and then the control hens. The interaction between the strain and feed treatment (SxT) was significant in the later two periods studied. No significant differences were observed in age at sexual maturity between the two strains or among the feeding treatments. In addition, GM pullets produced significantly higher egg number (EN) during all periods studied than G. The same trend was found in rate of laying (Rl). However, strain had no effect on either EN or Rl at 120 days of production. With respect to the feed conversion during laying interval (Fel), GM pullets showed significantiy (P<O.OS) better FCl than G during the 1st, 2nd, and 3rd month of laying while no significant effect of food allocated treatment were found. The G pullets produced significantly (P<Q.001) heavier eggs which had significantly (P<O.001) heavier shell than GM, while the opposite was true with respect to albumen percentage. While control pullets produced lighter eggs than the other treated groups, pullets which were received +8% feed allowance had the lowest yolk index (YI) values. There were highly significant interactions between SxT of egg weight (EW), shell weight and albumen weight percentages and Haugh units. Also, significant interaction between SxT was found with respect to VI. Neither the strain nor feeding treatment had significant effects on both fertility and hatchability. However, the percentage of early dead embryos of G eggs was significantly (P<O.001) higher than that of GM chicks. These results indicated that increasing the food allowance by 8% resulted in an increase in growth traits, while a decrease of 16% in Gimmizah birds and 8% in Golden Montazah birds of feed allowance improved the egg production | ||||
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