Response of Broiler Chickens to Quantitative Feed Restriction with or without Ascorbic Acid Supplementation
محورهای موضوعی : Camel
اُ.آ. آدیمی
1
,
سی.پی. نجوکو
2
,
اُ.م. اُدونباکو
3
,
اُ.م. سگونل
4
,
ال.تی. اگبیال
5
1 - Department of Animal Production and Health, Federal University of Agriculture Abeokuta, Abeokuta, Nigeria
2 - Department of Animal Production and Health, Federal University of Agriculture Abeokuta, Abeokuta, Nigeria
3 - Department of Animal Production and Health, Federal University of Agriculture Abeokuta, Abeokuta, Nigeria
4 - Department of Animal Production and Health, Federal University of Agriculture Abeokuta, Abeokuta, Nigeria
5 - Department of Animal Production and Health, Federal University of Agriculture Abeokuta, Abeokuta, Nigeria
کلید واژه: Broiler, Ascorbic acid, haematological, restriction, supplementation,
چکیده مقاله :
Ascorbic acid (vitamin C) supplementation has been documented as a useful tool to improve the performance of laying birds reared under harsh environmental conditions. However, there is limited information on the use of ascorbic acid as a means of ameliorating the stressful conditions imposed by feed restriction. To this effect a 3 × 2 factorial experiment was carried out to evaluate the effect of ascorbic acid inclusion in the diet of broiler chickens under quantitative feed restriction. A total of 96 unsexed 22 days-old Marshall broiler chickens of a commercial strain were distributed to six treatments, birds on treatments 1 and 2 were fed ad libitum, and those in treatments 3 and 4 were placed on 85% ad libitum while those on treatments 5 and 6 were offered 70% ad libitum. Diets fed to birds on treatments 1, 3 and 5 were formulated without ascorbic acid while those on treatments 2, 4 and 6 had their diets supplemented with 200 mgkg-1 ascorbic acid. Blood samples were collected from one bird per replicate for haematological and serum biochemistry on the 35th and 49th days of the study. Performance indices (feed intake, weight gain and intake:gain ratio) were significantly (P<0.05) influenced by quantitative feed restriction. Feed intake (3256.93, 2799.74 and 2360.05 g/bird) and weight gain (1134.70, 1023.88 and 968.86 g/bird) had highest values recorded for the birds fed ad libitum while those on 70% ad libitum feeding recorded the best intake: gain ratio (2.87, 2.74 and 2.44). Ascorbic acid supplementation significantly (P<0.05) affected the growth performance of broilers. Birds fed diets containing ascorbic acid had relatively high values in the growth performance indices considered. Quantitative feed restriction and ascorbic acid supplementation did not affect the haematological and serum biochemical parameters studied. It can be concluded that quantitative feed restriction and ascorbic acid supplementation influenced the growth performance of broilers.
مکمل‌سازی اسید اسکوربیک (ویتامینC) به عنوان یک ابزار مفید برای بهبود عملکرد پرندگان تخمگذار پرورش یافته در شرایط سخت زیست محیطی اثبات شده است. با این حال، در استفاده از اسید اسکوربیک به عنوان وسیله‌ای برای اصلاح و رفع شرایط تنش‌زای اعمال شده در شرایط محدودیت غذایی، اطلاعات کمی وجود دارد. به این منظور یک آزمایش فاکتوریل 3 × 2 به برای بررسی اثر اسید اسکوربیک گنجاندن در جیره غذایی جوجه‌های گوشتی تحت محدودیت کمی غذایی انجام شد. در مجموع 96 جوجه گوشتی 22 روزه سویه تجاری مارشال مخلوط دو جنس در شش تیمار توزیع شد، پرندگان در تیمار 1 و 2 تا حد اشتها تغذیه شدند، و تیمار 3 و 4 در 85 درصد اشتها تغذیه شدند، در حالیکه تیمارهای 5 و 6 در 70 درصد اشتها تغذیه شدند. جیره‌های تغذیه شده به پرندگان در تیمارهای 1، 3 و 5 بدون اسید اسکوربیک فرموله شدند در حالیکه آنهایی که در تیمارهای 2، 4 و 6 بودند جیره غذایی با 200 میلی‌گرم در کیلوگرم اسید اسکوربیک دریافت نمودند. در روز 35 و 49 نمونه خون از یک پرنده در هر تکرار برای مطالعه خون شناسی و بیوشیمی سرم جمع‌آوری شد. شاخص‌های عملکرد (مصرف خوراک، افزایش وزن و ضریب تبدیل) به طور معنی داری (05/0>P) تحت تأثیر محدودیت غذایی کمی بود. مصرف خوراک (93/3256، 74/2799 و 05/2360 گرم/پرنده) و افزایش وزن (70/1134، 88/1023 و 86/968 گرم/پرنده) بالاترین عدد را در پرندگان تغذیه شده در حد اشتها داشت در حالیکه آنهایی که در 70 درصد حد اشتها تغذیه شدند بهترین ضریب تبدیل (87/2، 74/2 و 44/2) را داشتند. مکمل اسید اسکوربیک به طور معنی داری (05/0>P) عملکرد رشد جوجه‌های گوشتی را تحت تأثیر قرار داد. پرندگان تغذیه شده با جیره‌های حاوی اسید اسکوربیک مقادیر نسبتا بالایی در شاخص‌های عملکرد رشد داشتند. محدودیت کمی غذایی و مکمل اسید اسکوربیک بر پارامترهای خونی و بیوشیمیایی سرم مورد مطالعه تأثیر نداشت. می‌توان نتیجه گرفت که محدودیت کمی غذایی و مکمل اسید اسکوربیک عملکرد رشد جوجه‌های گوشتی را تحت تأثیر قرار می‌دهد.
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