اثرهای سطوح مختلف آنزیم بتا ماناناز (همی سل) بر عملکرد و پارامترهای خونی جوجه های گوشتی

نویسندگان

1 استادیار علوم دامی (تغذیه دام)، گروه علوم دامی، دانشکده علوم کشاورزی دانشگاه گیلان

2 استادیار فیزیولوژی دامپزشکی، گروه علوم دامی، دانشکده علوم کشاورزی دانشگاه گیلان

3 دانشجوی سابق کارشناسی ارشد علوم دامی، دانشکده علوم کشاورزی دانشگاه گیلان

چکیده

به منظور بررسی اثرهای سطوح مختلف آنزیم بتاماناناز بر عملکرد، پارامترهای خونی و صفات لاشه 240 قطعه جوجه ی گوشتی سویه آربور ایکرز با میانگین وزن 6/44 گرم (مخلوط نر و ماده)، آزمایشی در قالب یک طرح کاملاً تصادفی در 4 تیمار و 5 تکرار و 12 مشاهده در هر تکرار انجام شد. آنزیم بتا ماناناز در سطوح صفر (1 T شاهد)، 035/0 (2 T) ، 05/0 (3 T) و 075/0 (4 T) درصد به 4 جیره غذایی بر پایه ذرت و کنجاله ی سویا برای دوره های آغازین (7-21 روزگی)، رشد (21-42 روزگی) و کل دوره افزوده شد. مصرف خوراک روزانه (گرم/جوجه/روز)، افزایش وزن روزانه (گرم/جوجه/روز)، ضریب تبدیل خوراک، پارامترهای خونی شامل کلوگز، کلسیم و فسفر(میلی گرم/دسی لیتر) در دوره های پرورش، یکنواختی وزن بدن (درصد)، و صفات لاشه (درصد) در پایان دوره اندازه گیری شد. نتایج نشان داد که افزودن آنزیم بتاماناناز به جیره های غذایی گروه های آزمایشی باعث افزایش معنی دار وزن زنده روزانه و بهبود ضریب تبدیل خوراک در تیمارهای حاوی آنزیم نسبت به تیمار شاهد در دوره ی رشد و در کل دوره ی پرورش شد (05/0> p). مصرف خوراک روزانه، شاخص های خون (گلوکز، کلسیم و فسفر)، یکنواختی وزن بدن و صفات لاشه (درصد بازده لاشه، درصد سینه، درصد ران، درصد کبد، درصد سنگدان و درصد کلی دستگاه گوارش) جوجه های گوشتی تحت تاثیر سطوح مختلف آنزیم ها قرار نگرفت (05/0<p). بنابراین مصرف حداقل میزان 035/0 درصد از آنزیم بتا ماناناز موجب افزایش وزن زنده روزانه و بهبود ضریب تبدیل خوراک جوجه های گوشتی در دوره های رشد و کل دوره شده است.

عنوان مقاله [English]

The effects of different levels of β-mannanase (Hemicell®) on the performance and blood parameters of broiler

نویسندگان [English]

  • M Haghighian Roodsari 1
  • M Roostaei Alimehr 2
  • A.H Amjadi Golpayegani 3
1 Assistant Prof. in Animal Science (Nutrition), College of Agriculture, The University of Guilan.
2 Assistant Prof. in Veterinary Physiology, College of Agriculture, The University of Guilan
3 Former MS Student of Animal Science, College of Agriculture, The University of Guilan.
چکیده [English]

In order to study the effect of different levels of β-mannanase enzyme on the performance, blood parameters and carcass characteristics of broiler chicks (Arbor acres), an experiment was conducted with 240 checks (44.6 grams average weight) under a completely randomized design with 4 treatments and 5 replications and 12 checks per each replicate. β-mannanase enzyme with the levels of zero (T1 control), 0.035 (T2), 0.05 (T3) and 0.075 (T4) percent were added to 4 experimental diets on the basis of maize-soybean meal for the periods of starter (7-21 days), grower (21-42 days) and total period of feeding system. Daily feed intake (g/check/day), daily live weight gain (g/check/day), feed conversion ratio (FCR), blood parameters including glucose, calcium and phosphorous (mg/dl) during all periods of feeding system, percent body weight uniformity and carcass characteristics (%) at the end of feeding period, were measured. The results showed that addition of β-mannanase enzyme to experimental diets have increased daily live weight gain and improved FCR of all treatments containing  β-mannanase significantly (p<0.05) with respect to control during grower and total period of feeding system. But daily feed intake, blood parameters (glucose, calcium and phosphorous), body weight uniformity, and carcass characteristics as dressing percentage, % thigh, % breast, % liver, % gizzard, and % of total luminal tract of broilers did not affect by different levels of enzymes (p> 0.05). Therefore, use of minimum of 0.035 % of β-mannanase would increase daily live weight gain and improves FCR of broilers in grower and total period of feeding system.

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