There are numerous molting programs used in research and in the commercial layer industry. If the program is conducted properly, the productive life of a laying hen flock can be substantially increased. Many research studies on molting programs have focused on the physical manipulation of the program itself as well as the nutritional recovery of the diet used. Though, there are many methods employed to induce molting of commercial hens, feed removal is used most frequently. Withdrawal of feed for up to 10-14 days is commonly used, resulting in a temporary state of fasting. Logman and Brown Nick strains were used in this study with a production capacity of 78.7 and 68.2% at 72nd week of rearing period. Molting was induced by Feed Withdrawal (FW). Briefly, feed was replaced with mosaic for 10 days, followed by supplementing barley gradually containing 1-1.5% mosaic for the next 10 days. The FW treatment resulted in total cessation of egg production within 14 days for Logman and 28 days for Brown Nick while the birds remained out of production. The rate of egg production was significantly improved by force molting treatments when compared with their 2 weeks period (72-73 week) of the commencement of treatments. Egg production period for Logman hens was shorter than that of Brown Nick which resulted in lower yield in total. Return to pre-molt status was similar in both groups; however menarche time varied between strains. Post-molt menarche and return to pre-molt status had occurred on day 21 for Logman and day 5 for Brown Nick. Post-molt hen-day production peaks were at 86th week for Logman with an 88.8% yield and 83rd week for Brown Nick with 75.0% yield. Brown Nick produced more cracked eggs between 75th and 83rd weeks of the experiment while Logman produced more cracked eggs than that of Brown Nick did during the other periods. Mortality, was evidently high in both groups during the molting period. However, throughout the study, mortality for both molting groups was within the expected range As a result of this study, Brown Nick performed better than Logman in terms of egg production, post molt-menarche time, cracked eggs while Logman was better in terms of post molt hen-day peak and mortality figures.

AkrumHamdy

Akrum Hamdy [email protected] 01006376836

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نشرت فى 11 ديسمبر 2008 بواسطة AkrumHamdy

أ.د/ أكـــرم زيـن العــابديــن محـــمود محمـــد حمــدى - جامعــة المنــيا

AkrumHamdy
[email protected] [01006376836] Minia University, Egypt »

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