Effects of Different Levels of Guar Meal and β-Mannanase on Performance, Yolk Cholesterol Concentration and Blood Lipid Parameters of Laying Hens in Second-Cycle of Production

محورهای موضوعی : Camel

م. حسنی ¹ , م. رضایی ² , ز. انصاری پیرسرایی ³ , ک. یوسفی کلاریکلائی ⁴

1 - Department of Animal Science, Faculty of Animal Science and Fishery, Sari Agricultural Science and Natural Resources University, Sari, Iran
2 - Department of Animal Science, Faculty of Animal Science and Fishery, Sari Agricultural Science and Natural Resources University, Sari, Iran
3 - Department of Animal Science, Faculty of Animal Science and Fishery, Sari Agricultural Science and Natural Resources University, Sari, Iran
4 - Department of Animal Science Research, Golestan Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), Gorgan, Iran

تاریخ دریافت : 1396/12/08 تاریخ پذیرش : 1397/05/09 تاریخ انتشار : 1398/03/11

کلید واژه: performance, Enzyme, laying hen, Cholesterol, guar meal,

چکیده مقاله :

A 3 × 2 factorial arrangements with completely randomized design, with a total of 72 Leghorn Hy-line (W-36) laying hens in the second cycle (98 wk old) of production were randomly assigned to 24 wire cages (45.7×30×30 cm3) and fed with diets containing three levels of guar meal (GM; 0, 4 and 8%) and two levels of β-mannanase (Hemicell®) enzyme (0.00 and 0.05%) for 12 wk period. There were four replicates per treatment with three hens in each replicate. Egg yolk cholesterol and serum lipids (triglyceride, cholesterol, low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C)) concentrations were measured at 110 wk of age. No significant differences were observed when feeding GM on egg production (EP), feed intake (FI) and feed conversion ratio (FCR). Supplementation of enzyme significantly reduced FI and improved FCR (P<0.05). Significant interaction was observed between enzyme and GM on egg weight (EW) and egg mass (EM) (P<0.05). Adding enzyme, decreased EW and EM in 4% GM diet but had diverse effect in control diet. The results of this study indicated that GM can be used in laying hens diets in the second-cycle of production up to 8% without any adverse effects on performance. The GM diets reduced serum triglyceride (P<0.05) and slightly egg yolk cholesterol concentrations. Supplementation of beta-mannanase enzyme significantly improved FCR by decreasing FI and also has significantly effect on decreasing egg yolk cholesterol and serum triglyceride (P<0.05).

چکیده انگلیسی:

در یک آزمایش فاکتوریل 2 × 3 با طرح پایه کاملاً تصادفی، تعداد 72 قطعه مرغ­های تخمگذار تجاری لگهورن سویه‌­های لاین (W-36) در دوره دوم تخمگذاری (98 هفته) در 24 قفس سیمی (30×30×7/45 سانتی­متر مکعب) به ­صورت تصادفی توزیع و به مدت 12 هفته با سه سطح کنجاله گوار (0، 4 و 8 درصد) و دو سطح آنزیم همی‌سل® (0 و 05/0 درصد) تغذیه شدند. هر گروه آزمایشی دارای 4 تکرار و 3 قطعه مرغ در هر تکرار بود. میزان کلسترول تخم­مرغ و غلظت لیپیدهای خون (تری­گلیسرید، کلسترول، لیپوپروتئین با دانسیته کم، لیپوپروتئین با دانسیته زیاد) در 110 هفتگی اندازه­گیری شد. سطوح مختلف کنجاله گوآر اثر معنی­داری بر تولید تخم­مرغ، مصرف خوراک و ضریب تبدیل غذایی نداشت. استفاده از آنزیم در جیره، باعث کاهش معنی­دار مصرف خوراک و بهبود ضریب تبدیل غذایی شد (05/0P<). وزن تخم­مرغ و وزن توده تخم­مرغ به طور معنی­داری تحت تأثیر اثر متقابل کنجاله گوار و آنزیم قرار گرفت (05/0P<). افزودن آنزیم به جیره در سطح 4 درصد کنجاله گوآر وزن و توده تخم­مرغ را کاهش داد ولی در گروه آزمایشی که با جیره شاهد تغذیه شده بودند اثر معکوس داشت. نتایج این آزمایش نشان داد که استفاده از کنجاله گوار تا سطح 8 درصد در جیره مرحله دوم تولید بدون تأثیر منفی بر عملکرد مرغ­های تخمگذار قابل استفاده است. استفاده از کنجاله گوآر سبب کاهش معنی­دار (05/0P<) تری­گلیسیرید خون و تا حدی کلسترول زرده تخم­مرغ شد. مکمل آنزیمی بتاماناناز با کاهش مصرف خوراک سبب بهبود معنی­دار ضریب تبدیل غذایی شد و همچنین اثر معنی­داری بر کاهش کلسترول زرده تخم­مرغ و تری­گلیسیرید سرم داشت (05/0P<).

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