Layers Performance As Affected By Some Environmental Factors

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Elnor, Khalid Osman Elmussaad
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The objective of the present study was to investigate the effect of some environmental factors on layers performance with such as; egg production percentage, egg weight, feed intake, feed conversion ratio (CFR) and mortality rate. The data being used in the present research work was obtained from an experiment carried out at the Demonstration Farm of Kuku Animal Production Research Station during the period of 25/8/2005 to 14/12/2005. The housing system employed in the experiment was stepped batteries in an open housing. The layers used were Hisex breed at an age of four mouths. Two types of poultry rations (maize and dura) which were carefully balance in energy and protein were used in feeding layers. The temperature range inside the housing system during summer was (33°c- 38°c), while for winter it was 29°c- 35°c. Generally results showed that, for all layers performance parameters being studied, winter is superior to summer and maize is superior to dura. Duncan’s Multiple Range Test (DMRT) showed that, for egg production percentage there is no significant difference among combinations of summer + dura, summer + maize and winter + dura (P<0.01). For egg weight DMRT showed a highly significant difference among the four combinations of summer + dura, summer + maize, winter + dura and winter + maize. (P<0.01). As far as the feed intake is concerned DMRT showed that there is significant difference between the combinations of summer + dura and summer + maize (P<0.01). Concerning FCR, the DMRT showed no significant difference among the four combinations (P<0.01). With respect to mortality rate the DMRT showed no significant difference among the combinations of summer + dura, summer + maize wand winter + maize (P<0.01). Due to the fact that, the layers being used in the experiment were reared at temperature above the thermal comfort zone (15°c – 25°c) and also above the thermal acceptable zone (25°c – 30°c) cooling of birds housing by different means could increase layers performance.
University of khartoum