Effect of Processing of Sorghum Stover Based Diets on Performance, Values of Haematological and Biochemical Parameters and Immune Response in Growing Nellore Lamb
محورهای موضوعی : Camel
د. ناگالاکشمی
1
(College of Veterinary Science, Sri Venkateswara Veterinary University, Hyderabad, 500030, India)
ک. دهانالاکشمی
2
(College of Veterinary Science, Sri Venkateswara Veterinary University, Hyderabad, 500030, India)
کلید واژه: Performance, expander extruder pelleting, immune response, lambs, sorghum stover,
چکیده مقاله :
A complete diet (Total Mixed ration) with sorghum stover (40%) as sole roughage source was prepared and offered to animals under two forms: as mash or as expanded-extruded pellets (EEP). These two complete diets were compared with a conventional diet (ad libitum chopped sorghum stover fed separately with concentrate mixture to meet 80% of protein requirements). These three diets were randomly allotted to 30 male lambs for a period of 150 days. The lambs on conventional, mash and pelleted diet grew with an average daily gain of 62.5g, 78.5g and 101.3g, respectively, with superiority (P<0.01) of EEP diet in relation to the others. The lambs fed complete diets were more efficient in utilizing the dry matter (DM) than those fed conventional diet despite lower DMI. The haematological (total erythrocyte and leucocyte counts, and percentage of neutrophil and lymphocyte) and serum biochemical constituents (total protein, albumin, globulin and urea nitrogen concentration) at 0, 75 and 150 d of trial were not affected by diets, except haemoglobin concentration which was significantly higher in lambs fed EEP diet (P<0.001). The lipid peroxidase activity was lower (P<0.05) and the RBC catalase activity (P<0.01) was higher in both groups of lambs fed with complete diet. The humoral immune response against Brucella abortus was higher in lambs fed with EEP diet compared to the lambs fed with mash or conventional diets. The total Ig, IgM or IgG titres against 20% chicken red blood cells were higher in lambs fed complete diets and were not affected by expander extruder processing. The cell mediated immune response of lambs assessed as in vitro lymphocyte assay at 150 d of feeding was higher (P<0.05) in EEP diet followed by those in mash complete diet and lastly by those fed conventional diet.
در این آزمایش یک جیره کامل (جیره کاملأ مخلوط شده) حاوی علوفه سورگوم (40 درصد) به عنوان منبع انحصاری علوفه خشک در اختیار بره‌ها در دو شکل آردی و پلت قرار گرفت. این دو جیره با یک جیره معمول (علوفه سورگوم خرد شده که به صورت آزاد و به‌طور جداگانه با کنسانتره به‌منظور برآورد 80 درصد از نیازمندی‌ها تغذیه می‌شدند) مقایسه شدند. جیره‌ها به‌طور تصادفی به 30 بره نر در یک دوره 150 روزه اختصاص یافتند. میانگین افزایش وزن روزانه بره‌ها روی جیره‌های معمول، آردی و پلیت به‌ترتیب 15/62، 5/68 و 3/101 گرم بود. با وجود ماده خشک مصرفی کمتر، بره‌های تغذیه شده با جیره‌های کامل از ماده خشک مصرفی با راندمان بالاتری استفاده کردند. به استثناء غلظت هموگلوبین که به‌طور معنی‌داری در بره‌های تغذیه شده با جیره پلت بالاتر بود، سایر پارامترهای هماتولوژیکی (شمار اریتروست و لکوسیت ها، درصد نوتروفیل و لنفوسیت) و بیوشیمیایی سرم (کل پروتئین، آلبومین، گلوبولین، غلظت ازت ادرار) در روزهای 0، 75 و 150 از جیره‌های آزمایشی تاثیر نپذیرفت. فعالیت پروکسیداز لیپیدی و فعالیت کاتالاز گلبول‌های قرمز خون در گروه‌های تغذیه شده با جیره‌های کامل به‌ترتیب پایین‌تر و بالاتر بود. پاسخ ایمنی هومورال علیه بروسلاآبورتوس در بره‌های تغذیه شده با جیره پلت در مقایسه با بره‌های تغذیه شده با جیره‌های آردی یا معمول بالاتر بود. عیارهای Ig تام، IgM یا IgG علیه سلول‌های قرمز خونی 20 درصد جوجه در بره‌های تغذیه شده با جیره‌های کامل بیشتر بود و از فرآیند پلیت‌کردن تأثیر نپذیرفت. پاسخ ایمنی به‌واسطه سلولی بره‌ها در روز 150 تغذیه بالاترین مقدار را در جیره پلیت داشت و در رتبه‌های بعدی به‌ترتیب جیره کامل آردی و جیره معمولی قرار داشت
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