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اثر سطوح مختلف کود مرغی فرآوری‌شده در جیرة غذایی بر عملکرد پرواری گوساله‌های نر هلشتاین

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه علوم دامی، دانشکدة کشاورزی دانشگاه تربیت مدرس، تهران

2 دانشیار، گروه علوم دامی، دانشکدة کشاورزی دانشگاه تربیت مدرس، تهران

3 دانشیار، مؤسسة تحقیقات علوم دامی کشور، حیدرآباد، کرج

چکیده

در این پژوهش، اثر جیره‌های غذایی حاوی چهار سطح (صفر، 8، 16 و 24 درصد) کود مرغی فرآوری‌شده، با انرژی و پروتئین یکسان، بر عملکرد پرواری 60 رأس گوسالة نر هلشتاین با میانگین وزن زندة 9±309 کیلوگرم و سن حدود 9-8 ماه، در قالب طرح کاملاً تصادفی به مدت 200 روز بررسی شد. در پایان دورة آزمایش همة گوساله‌ها کشتار شدند و علاوه بر بازرسی لاشه و ارگان‌ها، وزن لاشه و آلایش‌های خوراکی و غیرخوراکی تعیین شد. نتایج نشان داد که میانگین مادة خشک مصرفی روزانة گوساله‌های تغذیه‌شده با جیره‌های حاوی چهار سطح کود مرغی در کل دورة آزمایش به ترتیب 17/10، 28/10، 97/9 و 26/10 کیلوگرم، میانگین افزایش وزن روزانة آن‌ها به ترتیب 1339، 1305، 1362 و1311 گرم در روز و ضریب تبدیل غذایی به ترتیب 7/7، 9/7، 4/7 و 6/7 بود که هیچ‌یک از متغیرهای مزبور تحت تأثیر سطوح مختلف کود مرغی فرآوری‌شده در جیرة غذایی قرار نگرفت (05/0 P>). همچنین پارامتر‏های مربوط به وزن لاشه، راندمان لاشه، وزن آلایش‌های خوراکی و غیرخوراکی تحت تأثیر جیره‏های غذایی قرار نگرفت (05/0 P>). براساس مشاهدات و بازرسی کشتارگاهی، رنگ و بوی لاشه و ارگان‌ها در همة دام‌ها طبیعی بود و تفاوتی بین دام‌های گروه‌های آزمایشی مشاهده نشد. هزینة تمام‌شده نیز در گروه‌های دریافت‌کنندة جیره‌های حاوی 16 و24 درصد کود مرغی کمتر بود. بر اساس یافته‌های پژوهش حاضر، مصرف کود مرغی از 16 تا 24 درصد در جیرة گوساله‌های پرواری قابل استفاده است اما در شرایط مزرعه سطح بالاتر از 20 درصد در کل جیره توصیه نمی‌شود. 

کلیدواژه‌ها


عنوان مقاله [English]

Effect of different levels of dietary processed broiler litter on the performance of Holstein male cows

نویسندگان [English]

  • Ahmad Mohammadi 1
  • Yousef Rouzbehan 2
  • Hasan Fazaeli 3
1 M. Sc. Student, Department of Animal Science, Faculty of Agriculture, Tarbiat Modares University, Tehran
2 Associate Professor, Department of Animal Science, Faculty of Agriculture, Tarbiat Modares University, Tehran
3 Associate Professor, Department of Aniaml Science, Animal Science Research Institute, Karaj
چکیده [English]

In a completely randomized design, the effect of four iso-protein and iso-caloric diets containing different levels (0, 8, 16 and 24%) of processed broiler litter was studied on the fattening performance of 60 Holstein male calves (with initial weight of 309±9kg and about 8-9 month age) for a period of 200 days. At the end of the experiment, all animals were slaughtered and then the carcasses, edible and non-edible parts were weighted after carcass inspection. Results showed that the average dry matter intake of calves fed diets containing four levels of poultry litter, were respectively 10.17, 10.28, 9.97 and 10.26 kg/d, daily weight gain were 1339, 1305, 1362 and 1311 g/d, and feed conversion ratio were 7.7, 7.9, 7.4 and 7.6 that were not affected by the experimental diets (P>0.05). In addition, the carcass weight, carcass dressing percentage and organs were not different among the treatments (P>0.05). Based on the visual tests, the carcasses and organs, no differences were observed between the animals received different levels of broiler litter.  Economically, feeding cost was lower when the animals received diets containing 16 and 24% of broiler litter. Based on the results of this experiment, the processed broiler litter could be included in the diet of finishing calves, however it is recommended that the optimum level to be about 20% on the farm conditions.

کلیدواژه‌ها [English]

  • processed broiler litter
  • Fattening ration
  • Holstein male calves
 

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