| Titles |
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English :
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Duration of fertility and productive performance of mamourah laying hens as influenced by feeding system during the last periods of the first year production
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Arabic :
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تأثير مدة الخصوبة و الاداء الانتاجى لامهات دجاج المعمورة بنظام التغذية في نهاية السنة الانتاجية الاولى
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| Abstract |
The objective of this study was to investigate the productive performance and duration of fertility of Mamourah laying hens during the last two periods of the first year of production fed either ad -libitum or feed restricted. A total number of one hundred and twenty Mamourah laying breeders (56 week of age) were selected from pedigreed close flock.
Hens were classified into three category groups (40 hens of each) according to body weight (X±SD). The three groups were heavy body weight (2138±160g), medium (l820±102g) and light (1626±124 g). Each category group was randomly divided into two sub groups (20 hens of each). The first one was fed a commercial layer diet ad-libitum with 16.13% CP and 2702.2 K cal ME/Kg feed. The second sub-group was fed restricted diet to maintilin breeder at a recommended body weight during the last two periods of laying, 56-60 wks and from to 60-64 wks respectively. All birds were individually housed in cages and artificially inseminated on 2 consecutive days with 0.05ml-pooled semen.
The results indicate that feeding layer ad-libitum significantly (P<0.01) increased finial body weight; weight gain; egg number; egg weight and egg mass g/day. However, duration of fertility and feed utilization were reduced during laying period as compared with layer fed restricted diet. Significant (P<0.01) decrease in each of egg number and hen day percentage was observed in heavy birds as compared with the medium and light ones, however, values of egg weight. Feed intake and efficiency index were increased. While, duration of fertility was not affected by initial body weight. Duration of fertility was significantly (P<0.01) increased, while feed intake was decreased by advance of production period. A significant (P<0.01)-interaction effect between feeding system and studying periods was found on each initial body weight category, feed intake, feed conversion, gain/ or loss in body weight, and efficiency index. While each egg number, hen-day percentage, egg mass and finial body weight significantly (P<0.05) affected by this interaction. Also, each of feed intake, feed conversion and efficiency index was afficted significantly (P<0.01) by interaction between live body weight category and feeding system. The linear and quadratic regression coefficients of duration of fertility on each of egg number, egg mass, hen-day percentage and efficiency index were positively significant (P<0.01), while, feed conversion has negative response. However, live body weight was positively insignificant in quadratic regression coefficient and negatively in linear regression coefficient on duration of fertility. On contrast, egg weight was negatively insignificant by quadratic regression coefficient and positively in Iinear regression coefficient on duration of fertility.
It could be concluded that live body weight in Mamourah laying hens did not affect the duration of fertility, but affected egg production feed utilization. However, feed restriction increased duration of fertility and improve feed utilization, while, egg production was declined at the end of the first production year.
Keywords: fertility,laying, feeding, period.
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| Publication year |
2004
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| Pages |
719-735
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| Availability location |
معهد بحوث الانتاج الحيوانى-شارع نادى الصيد- الدقى - الجيزة
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| Availability number |
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| Organization Name |
Animal Production Research Institute (APRI)
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| City |
الاسكندرية
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| serial title |
Egyptian Poultry Science
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| ISSN |
1110-5623
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| Author(s) from ARC |
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| Agris Categories |
Animal physiology - Reproduction
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AGROVOC
TERMS |
Feeding.
Fertility.
Layer chickens.
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| Proposed Agrovoc |
productive performance;Mamourah laying hens;feed restricted;ad -libitum;
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| Publication Type |
Journal
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