THE RESPONSE AFFECTED BY PROGRAMS OF LAYING HENS TO INDUCED MOLT AS STRAIN, FEEDING AND LIGHTING | ||||
| Journal of Animal and Poultry Production | ||||
| Article 5, Volume 27, Issue 7, July 2002, Page 4463-4481 PDF (1.82 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2002.255738 | ||||
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| Authors | ||||
| Mervat A. Breikaa,; Nazla Y. Abou EI-Ella; Yousria K. Afify; M. M. Balat | ||||
| Animal Production Research Institute, Agricultural Research Center, Ministry of Agriculture, Giza, Egypt | ||||
| Abstract | ||||
| This experiment was conducted to study the performance of Gimmizah (G) and Golden Montazah (GM) hens which were induced to molt by fast where feed was withdrawn until a target body weight loss of 33.04% was reached (14 days) or fed on ration that contained high level of zinc oxide (ZO) (20,000 ppm) for 7 days. The hens were subjected to two light length treatments, the first receiving 14 hr of light per day (UD) throughout the 24·week experiment and the second restricted to 8 hr UD during the dietary treatments. This group of hens received a 24-hr photoperiod for 1 wk to provide maximum stimulation prior to initiation of dietary treatments and 8 hr UD during the dietary treatments. Lightning interval was maintained through day 42, after which, lightning period was increased by one-halt hr per day until it reached 14 hr UD. Control group was maintained. All groups received a 16.84% protein layer ration throughout the experiment and given feed and water ad libitum. Body weight loss of G hens was significantly (P<0.01) higher than that ofGM ones at 63 weeks of age. The fast hens and the hens treated with ZO achieved about 33% and 20% BW loss, respectively, tilt Day 14 from the beginning of treatment. The BW of the two treated groups was significantly less than the control one during postmolting period. The lightining period had no effect on BW at all ages studied. In addition, G hens produced significantly more eggs than GM ones during 72·76 weeks of age only. Both the ZO and control groups produced approximately similar EN and they surpassed the fast one during molting while the two treated groups produced significantly (P<0.001) more eggs than the control one during both the 64·68,68-72 weeks of age. Moreover, Hens on the 8 hr UD produced significantly less EN during 68-72 weeks of age than hens which received 14 hr UD. On the other hand, the G hens had better (P<0.05) value of FE during 68·72 weeks of age than GM ones. Moreover, the fast group had the poorest value of FE during molting period and the feeding treatment had highly significant effect on FE during 68-72 weeks of age only. The UD had no effect on FE. Moreover, G hens produced significantly (P<O.001) heavier eggs than GM ones, and eggs produced by control hens were heavier than those of the treated hens. The lighting period had no significant effect on EW. Moreover, light per day significantly affected both Hu and SHT where 8 hr UD decreased Hu value but increased SHT. Age of hens showed highly significant effect on both EWand SHT. In addition, neither strain nor feed treatment had significant effects on For H. While UD showed no effect on H, the F of eggs produced from hens received 14 hr UD was higher than the restricted UD group. However, induced molting using the feeding and lighting progr-"ns in G and GM hens realizes positive REE except that in G ones which the REE of hens bred on 8 nr UD and fed ZO was less c:ompared with the control group. However, it could be concluded that most of the trajts studied were improved due to feeding and lighting programs used in this experiment. | ||||
| Keywords | ||||
| Force molting; body weight. egg number; egg quality; hatch traits; economic analysis | ||||
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