تاثیر اندازه ذرات خوراك و مکمل آنزیمی بر عملکرد رشد و خصوصیات رفتار شناسی در جوجه هاي گوشتی تغذیه شده با جیره بر پایه جو
محورهای موضوعی : زیست شناسی جانوری
1 - دکترای گروه علوم دامی، دانشگاه آزاد اسلامی، واحد کاشمر، کاشمر، ایران
کلید واژه: جو, جوجه هاي گوشتی , اندازه ذرات , عملکرد رشد, خصوصیات لاشه,
چکیده مقاله :
مقدمه: کاهش اندازه ذرات خوراك بعد از فرآیند پلت کردن به عنوان دومین عامل صرف انرژي در صنعت جوجه هاي گوشتی شناخته شده است. لذا هدف از این تحقیق بررسی تأثیر اندازه ذرات و افزودن آنزیم بر عملکرد رشد و خصوصیات لاشه جوجه هاي گوشتی تغذیه شده با جیره بر پایه جو بود.
مواد و روش ها: تعداد 288 قطعه جوجه گوشتی سویه تجاری راس 308، در قالب طرح کاملاً تصادفی و به روش آزمایش فاکتوریل 2×3با 6 تیمار،4 تکرار و12 پرنده در هر تکرار مورد استفاده قرار گرفت. متغیر های آزمایشی شامل، سطوح اندازه ذرات (سالم، متوسط 5 میلیمتري و ریز4 میلیمتري)و دو سطح افزودن مکمل آنزیمی (صفر و 055/0 درصد)مورد بررسی قرار گرفتند.
نتایج: اثر اندازه ذرات جو بر مصرف خوراك معنی دار نبود اما افزایش وزن بدن و ضریب تبدیل خوراك اختلاف معنی داري را نشان دادند (05/0>p) به طوريکه جوجه هاي گوشتی تغذیه شده با جو داراي ذرات ریز افزایش وزن بیشتر و ضریب تبدیل خوراك بهتري را نشان دادند. مکمل آنزیم نیز اثري بر افزایش وزن بدن نداشت اما خوراك مصرفی و ضریب تبدیل خوراك را به طور معنی داري کاهش داد (05/0>p). درصد رفتار پرندگان در حال خوراك خوردن و ایستادن نیز به طور معنی داري تحت تأثیر اندازه ذرات جو قرار گرفت به طوريکه پرندگان دریافت کننده جو داراي ذرات ریز بیشترین درصد در حال خوراك خوردن و کمترین درصد در حال ایستادن را نشان دادند.
نتیجه گیری: اثرات مفید آنزیم تحت تأثیر اندازه ذرات قرار گرفته و با تغییر اندازه ذرات جو، اثرات آنزیم بهبود پیدا کرد.
Introduction: The reduction of feed particle size after pelleting is recognized as the second most energy-intensive factor in the broiler industry. Objective: To investigate the effect of particle size and enzyme addition on growth performance and carcass characteristics of broilers fed barley-based diets.
Materials and Methods: A total of 288 commercial Ross 308 broiler chickens were used in a completely randomized design with a 2×3 factorial experiment with 6 treatments, 4 replications, and 12 birds per replication. Experimental variables included particle size levels (healthy, medium at 5 mm, and fine at 4 mm), and two levels of enzyme supplementation (0% and 0.055%) were investigated.
Results: The effect of barley particle size on feed intake was not significant, but body weight gain and feed conversion ratio showed significant differences (p<0.05), such that broilers fed barley with fine particles showed greater weight gain and better feed conversion ratio. Enzyme supplementation also did not affect body weight gain but significantly reduced feed intake and feed conversion ratio (p<0.05). The percentage of birds feeding and standing was also significantly affected by the size of the barley particles, such that birds receiving fine-grained barley showed the highest percentage of feeding and the lowest percentage of standing.
Discussion: The beneficial effects of the enzyme were affected by the particle size, and by changing the size of the barley particles, the effects of the enzyme improved.
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