نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار پژوهشی پژوهشکده دامهای خاص پژوهشگاه زابل
2 استادیار، گروه علوم دامی، دانشکده کشاورزی و منابع طبیعی، دانشگاه خلیج فارس، بوشهر، ایران
چکیده
پژوهش حاضر به منظور ارزیابی اثرات سینبیوتیک بر عملکرد، صفات کیفی تخممرغ، جمعیت میکروبی و ریختسنجی روده کوچک مرغهای تخمگذار در شرایط تنش مزمن گرمایی و برآورد نقطه بهینه مصرف آن با استفاده از مدلسازی خط شکسته انجام شد. این آزمایش در قالب طرح کاملاً تصادفی با چهار تیمار، چهار تکرار و نه قطعه مرغ در هرتکرار انجام شد. تیمارها شامل سطوح صفر(شاهد) 5/0، 1 و 5/1 گرم در کیلوگرم سینبیوتیک بود که به جیره پایه اضافه شد. یافتهها نشان داد که افزودن سین-بیوتیک، درصد تخمگذاری، توده تخممرغ و وزن تخممرغ را در 42-44 هفتگی و 44-46 هفتگی افزایش داد )05/0(p<. همچنین توده تخم مرغ و درصد تخمگذاری در همه گروههای دریافتکننده سینبیوتیک در مقایسه با شاهد، در کل دوره بیشتر بود05/0(p<. کمترین و بیشترین مقدار توده تخممرغ در کل دوره مربوط به گروه شاهد و گروه دریافتکننده 5/0 گرم سینبیوتیک بود(به ترتیب 88/45 و 6/49). شمار سالمونلا در گروههای 5/0، 1 و 5/1 گرم سینبیوتیک در مقایسه با شاهد کمتر شد )05/0(p<. برآورد سطح بهینه در جیره بر اساس مدلسازی خط شکسته خطی و درجه دو برای درصد تخمگذاری به ترتیب 93/0 و 05/1 گرم سینبیوتیک در کیلوگرم جیره بود. در مجموع، استفاده از سین-بیوتیک باعث بهبود وزن تخم مرغ، شاخص تولید و درصد تخمگذاری همراه با کاهش جمعیت سالمونلا شد و مقدار یک گرم در کیلوگرم برای شرایط تنش گرما توصیه میگردد.
کلیدواژهها
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