Effect of Supplementation with Synthetic Lysine on the Performance of Finisher Broiler Chicks

محورهای موضوعی : Camel

M. Melaku ¹ , M. Urge ² , G. Animut ³ , A. Getu ⁴

1 - Department of Animal Production and Technology, Faculty of Agriculture, Woldia University, Woldia, Ethiopia
2 - Department of Animal Production and Technology, Faculty of Agriculture, Haramaya University, Ethiopia
3 - Department of Animal Production and Technology, Faculty of Agriculture, Haramaya University, Ethiopia
4 - Department of Animal Production and Extension, Faculty of Veterinary Medicine, University of Gondar, Gondar, Ethiopia

تاریخ دریافت : 1392/10/17 تاریخ پذیرش : 1393/03/10 تاریخ انتشار : 1393/12/10

کلید واژه: supplementation, broiler chickens, commercial diet, Lysine,

چکیده مقاله :

The study was conducted to evaluate the effect of different levels of synthetic lysine (sLys) on dry matter intake (DMI), average daily weight gain (ADG), dry matter conversion ratio (DMCR), carcass characteristics and economics of productionof finisher broiler chicks. As 240 day-old broiler chicks were randomly distributed to 12 pens of 20 chicks each and assigned to four treatment rations in a completely randomized design. Six broilers (3 males and 3 females) from each replication were starved for 16 hours and slaughtered to evaluate carcass characteristics. Control diet had a lysine content of 0.9 and 0.8% of the ration, which was 0.3 and 0.2% of the ration below the recommended level. The four rations were formulated by including sLys at levels of 0, 50, 100 and 150% of the deficient amount of lysine. No sLys in the ration (T1) and rations to which 50% (T2), 100% (T3) and 150% (T4) of the deficient amount of lysine being added as sLys. No significance difference (P>0.05) was observed among treatments in total and daily DMI, metabolic energy (ME) and crude protein (CP) intakes and DMCR at all phases of the experiment. Final body weight (1665, 1672, 1707 and 1786 g (standard error of the means(SEM)=18.04)) and ADG during the entire period (33.0, 33.1, 33.9 and 35.5 g/day (SEM=0.36) for T1, T2, T3 and T4, respectively) was significantly higher (P<0.05) for birds kept on T4 diets. No significant difference (P>0.05) existed in mortality percentage among treatments. Dressed carcass weight (1407, 1426, 1461 and 1510 g (SEM=15.07)), breast weight (329, 334, 338 and 365 g (SEM=5.09)) and drumstick weight (134, 137, 135 and 150 g (SEM=2.3)for T1, T2, T3 and T4, respectively) were greater for T4 than other treatments. In conclusion, 12.5% extra addition of sLys above the level recommended by NRC to the commercial diets, as in T4, improved broiler performance and profitability.

چکیده انگلیسی:

این مطالعه برای ارزیابی اثرات سطوح مختلف لیزین سنتتیک روی ماده خشک مصرفی، متوسط افزایش وزن روزانه، ضریب تبدیل ماده خشک، خصوصیات لاشه و راندمان اقتصادی تولید جوجه­های گوشتی در مرحله پایانی انجام شد. 240 قطعه جوجه گوشتی به­ طور تصادفی بر پایه یک طرح کاملاً تصادفی در چهار تیمار جیره­ای توزیع شدند. جیره شاهد دارای محتوای لیزین 3/0 و 2/0 درصد پائین­تر از سطح توصیه شده بود. چهار جیره با استفاده از لیزین سنتتیک در سطوح 0، 50، 100و 150 درصد ازمقدارتوصیه لیزین تنظیم شدند. تفاوت معنی‌داری در میان تیمارها در ماده خشک مصرفی کل و روزانه، انرژی قابل متابولیسم، مصارف پروتئین و ضریب تبدیل خوراک مشاهده نشد (05/0‌P>). وزن پایانی (1665، 1707 و 1768 گرم (اشتباه معیار میانگین­ها=04/18)) و متوسط افزایش وزن روزانه در کل دوره (33، 1/33، 9/33 و 5/35 گرم در روز (اشتباه معیار میانگین­ها=36/0) برایT1، T2،  T3و  T4به ترتیب) به­ طور معنی­داری برای طیور نگهداری شده در جیره T4 بالاتر بود(05/0P<). هیچ اختلاف معنی­داری در مقدار تلفات در میان تیمارها آزمایشی مشاهده نشد (05/0‌P>). وزن لاشه (1407، 1426، 1461 و 1510 گرم (اشتباه معیار میانگین­ها=07/15))، وزن سینه (329، 334، 338 و 365 گرم (اشتباه معیار میانگین­ها=09/5)) و وزن ران (134، 137، 135 و 150 گرم (اشتباه معیار میانگین­ها=3/2) برای T1، T2،  T3و  T4به ترتیب) برای تیمار 4 در مقایسه با سایر تیمارها بیشتر بود. در نتیجه، اضافه نمودن 5/12 درصد لیزین سنتتیک بیش از سطح توسعه شده توسط جداول احتیاجات غذایی عملکرد جوجه­های گوشتی و سودآوری را بهبود داد.

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