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English :
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Productive and physiological responses in chickens to some nutritional factors
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Arabic :
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الاستجابات الإنتاجية و الفسيولوجية في الدجاج لبعض العومل الغذائية
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| Abstract |
This study was carried out at the poultry experimental station, Animal Production Department, Al-Azhar University, in order to investigate the effect of hypocholesterolemic agents(Bezafibrate and lipostabel EPL) on reducing cholesterol and lipid contents on in the blood as well as in egg yolk and affect its on hatchability of eggs in laying hens. A total number of 120 lohman selected leghorn females at 24 weeks of age were used in this study. Birds were divided randomly into 8 experimental groups 15 each representing two diets. The first diet was formulated without any fat supplementation while the second was supplemented with 4% animal tallow. Both experimental diets were formulated to be isonutrigenous isocaloric and contained 17% crude protein and 2800 K.cal/ME/kgm of diet. From 24 to 26 weeks of age birds were fed on the experimental diets without any hypocholesterolemic agents and blood samples were with drown at 26 weeks of age. At 26 weeks of age groups within each diet were fed the diet on supplemented with bezafibrate 150 ppm; 300 ppm EPL and 1500 ppm EPL/hen/day. A control group from each diet were fed the experimental diets without drugs supplementation.
Blood and egg samples were obtained at 26; 28; 32 and 36 weeks of age. All birds in the eight experimental groups were weighed at the start of the experiment and wing banded. All experimental groups were raised in laying batteries till the end of the experimental period at 36 weeks of age i.e. ten weeks after treatment. Feed and water were offered ad-libitum during the experimental period. Blood samples were withdrawn from five birds each experimental group and sample were exposed to chemical analysis. Results obtained can be summarized as follow:
A. Laying performance:
1. Neither fat supplementation nor hypocholesterolemic agents released sgnificant effects on final live weight of birds at the end of the experimental period.
2. Supplementing laying hen diets with tallow increased significantly (P<0.05) the daily feed consumption per bird Compared with the non-supplemented diets, regardless of hypocholesterolemic agents. On the other hand, hypocholesterolemic agents reduced significantly (P<0.05) the daily feed intake compared with the control groups in both diets and the reduction was more pronounced in the bezafibrate supplemented groups.
3. Regardless of the hypocholesterolemlc agents, diets containing supplementary fats improved the feed conversion at 36 weeks of age compared with the non-supplemented groups .Also irrespective off at supplementation, incorporation of hypocholesterolemic agents in both diets increased the feed conversion especially EPL at level of1500 ppm/hen/day.
4. Incorporation of tallow in laying hen diets improved egg production ,however supplementing both diets with hypocholesterolemic agents decreased the egg production compared with he control group.
5.Both fat supplementation and hypocholesterolemic drugs had no significant effects on egg weight; specific gravity; shape index; yolk index; shell thickness of eggs and percentage of yolk, albumen and shell of eggs.
6. Regardless of hypocholesterolemic drugs, Supplementing layinq-hen diets with tallow showed no effects on hatchability of fertile eggs.
On the other hand, irrespective of fat Supplementation bezafibrate and high level of EPL decreased the hatchability by 16.30 and 11.27% respectively compared with the control groups.
B. Blood; egg yolk and liver chemistry:
1. Regardless of hypocholesterolemic drugs, feeding laying hens on diets containing supplementary fat increased plasma total lipids at 36 weeks of age.Supplementing laying hen diets with EPL at both levels caused decrease plasma total lipids,while the bezafibrate decreased significantly (P<0.05) total plasma lipids, irrespective of fat level fed.
2.Incorporation of tallow in laying hen diets caused an insignificant increase in plasma total cholesterol, however the hypocholesterolemic drugs decreased total plasma cholesterol.
3. Diets containing tallow increased triglyceride contents significantly (P<0.05) compared with the diets containing no tallow, regardless of hypocholesterolemic agents Irrespective of fat level,incorporation of hypocholesterolmic agents in laying hen diets decreased plasma triglyceride especially the high level of EPL.
4.Both tallow and hypocholesterolemic agents had no significant effect on yolk total lipids
5. Egg yolk cholesterol contents did not effected with the tallow supplementation compared with the unsupplemented diets.Incorporation of hypocholesterolemic agents in laying hen diets decreased significantly (P<0.05) egg yolk cholesterol.Bezafibrate at level of 150 ppm and at EPL levels of 300 and 1500 ppm reduced egg yolk cholesterol by 26.65 ;22.24 and 32.27% respectively compared with the control group.
6. Fat incorporation in laying hen diets had no significant effect on liver total lipids regardless of hypocholesterolemic drugs.On the other hand, supplementing the laying hen diets with bezafibrate and high level of EPL decreased significantly (P<0.05) total lipid contents in liver tissues, regardless of level of tallow.
7. Fat level seemed to have no significant effect on liver cholesterol, regardless of the hypocholesterolemic drugs Liver cholesterol contents decreased significantly (P<0.05) by using the high level of EPL, regardless of fat level fed.
8. Bill contents of gall bladder had no significant effect with level of fat in the diets.Incorporation of hypocholesterolemic drugs in the diets caused increased significantly (P<0.05) Bill contents of gall bladder with high level of EPL compared with the control group.
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| Publication year |
1994
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| Pages |
PP. 199
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| Availability location |
مكتبة 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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| Country |
Egypt
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| Author(s) from ARC |
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| Agris Categories |
Animal physiology - Nutrition
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AGROVOC
TERMS |
Blood.
Cholesterol.
Egg hatchability.
Egg yolk.
Fats.
Layer chickens.
Lipids.
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| Proposed Agrovoc |
hypocholesterolemic agents;Bezafibrate;lipostabel;animal tallow;
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| Publication Type |
Master Thesis
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