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تأثیر محدودیت آبی بر عملکرد رشد، الگوی مصرف آب، گوارش‌پذیری، و صفات لاشه بره-های لری-بختیاری و آمیخته لری-بختیاری×رومانف | ||
| علوم دامی ایران | ||
| مقاله 2، دوره 54، شماره 3، مهر 1402، صفحه 225-238 اصل مقاله (1.35 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijas.2022.336760.653867 | ||
| نویسندگان | ||
| کبری پورراسد استمال؛ مهدی گنج خانلو* ؛ ابوالفضل زالی؛ مصطفی صادقی؛ ارمین توحیدی | ||
| گروه علوم دامی، دانشکده کشاورزی و منابع طبیعی، دانشگاه تهران، کرج، ایران | ||
| چکیده | ||
| این مطالعه باهدف بررسی عملکرد رشد، الگوی مصرف آب، گوارش‌پذیری، و صفات لاشه بره‌های لری-بختیاری (لری) و آمیخته لری-بختیاری×رومانف (آمیخته) در شرایط محدودیت آبی انجام گرفته است. تعداد 20 رأس بره (10 رأس از هر ژنوتیپ) با میانگین وزن 5/2±31 و سن 2±8 ماه در چهار تیمار با پنج تکرار به‌صورت طرح کاملاً تصادفی در قالب فاکتوریل 2×2 با دو سطح برای ژنوتیپ و دو سطح برای آب مورد استفاده قرار گرفت. میزان خوراک مصرفی، افزایش وزن روزانه و وزن نهایی تحت تأثیر ژنوتیپ و نحوه دسترسی به آب قرار نگرفت، درحالی‌که میزان مصرف آب (001/0=p) و نسبت آب به خوراک (02/0=p) با محدودیت آبی کاهش یافت. بره‌های دارای محدودیت آبی تقریباً 90 درصد آب خود را در پنج دقیقه اول مصرف کردند. گوارش‌پذیری مواد مغذی تحت تأثیر تیمارها قرار نگرفت ولی میزان ماده خشک مدفوع در محدودیت آبی بالاتر بود (03/0=p). وزن لاشه و بازده آن تحت تأثیر تیمارها قرار نگرفت، با این حال درصد و وزن دنبه در آمیخته‌ها پایین‌تر بود (0001/0˂p) اما بخشی از این کاهش به‌وسیله ضخامت چربی بالاتر (05/0=p) و چربی احشایی (01/0=p) بالاتر جبران شد. نتایج کلی این مطالعه نشان داد ژنوتیپ و محدودیت دسترسی به آب عملکرد رشد را به‌طور معنی‌داری تحت تأثیر قرار ندادند، بنابراین می‌توان آمیخته‌ها را در محیط‌های با محدودیت آبی مورد استفاده قرار داد. | ||
| کلیدواژه‌ها | ||
| گوسفند بومی؛ آمیخته گیری؛ محدودیت آبی؛ دنبه؛ صفات لاشه | ||
| عنوان مقاله [English] | ||
| The effect of water restriction on growth performance, water consuming pattern, digestibility, and slaughter parameters of Lori-Bakhtiari and Lori-Bakhtiari×Romanov lambs | ||
| نویسندگان [English] | ||
| Kobra Pourasad Astamal؛ Mahdi Ganjkhanlou؛ Abolfazl Zali؛ Mostafa Sadeghi؛ Armin Towhidi | ||
| Department of Animal Science, Faculty of Agriculture and Natural Resources, University of Tehran, Karaj, Iran. | ||
| چکیده [English] | ||
| The aim of this study was to investigate the growth performance, water consuming pattern, digestibility, and carcass traits of Lori-Bakhtiari (LORI) and Romanov-Lori-Bakhtiari (CROSSbred) lambs under water restriction conditions. Twenty lambs (10 heads per genotype) with an average weight of 31±2.5 and an age of 8±2 months were used in four treatments with 5 replications in each in a completely randomized design with 2×2 factorial. Water-restricted (WR) lambs had free access to water for only one hour a day. All lambs were slaughtered after six weeks. Feed intake, daily weight gain and final weight were not affected by genotype and access to water, while water intake (p=0.001) and water to feed ratio (p=0.02) were significantly dropped with water restriction. Water-restricted lambs consumed almost 90 percent of their water intake in the first five minutes. Nutrients digestibility was not affected by the treatments, but the amount of fecal dry matter was significantly high in water restricted groups (p=0.03). Carcass weight and yield were not affected by the treatments, but the percentage and weight of tails in the CROSSbred lambs were lower (p≤0.0001), but part of this decrease was compensated by higher fat thickness (p=0.05) and visceral fat (p=0.03). The overall results of this study showed that genotype and water restriction did not significantly affect growth performance, so CROSSbred lambs can be used in water restricted area. | ||
| کلیدواژه‌ها [English] | ||
| Native sheep, crossbreeding, Water restriction, Tail, carcass trait | ||
| مراجع | ||
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