Effects of Pre-Pubertal Plane of Nutrition on Skeletal Growth, Lamb Mortality, IGF-1 Concentrations, Quantity and Quality of Colostrum Production in Kurdish Female Lambs
محورهای موضوعی : Camelص. منتیان 1 , ح.ر. میرزایی الموتی 2 , ف. فتاح‌نیا 3 , ر. معصومی 4
1 - Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran
2 - Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran
3 - Department of Animal Science, Faculty of Agriculture, Ilam University, Ilam, Iran
4 - Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran
کلید واژه: colostrum, IGF-1, Kurdish ewes, lamb mortality, pre-pubertal diets, skeletal growth,
چکیده مقاله :
This experiment was conducted to investigate the effect of pre-pubertal plane of nutrition on the skeletal growth, lamb mortality, insulin-like growth factor1 (IGF-1) concentrations, quantity and quality of colostrum produced in ewe lambs. A total of 40 clinically health Kurdish female lambs (30±8.6 d and weighing 10.2±3.4 kg) were randomly allocated to one of two experimental diets in pre-weaning period: high quality diet (HQD, 2.50 Mcal ME/kg dry matter (DM) and 148 g CP/kg DM) or low quality diet (LQD, 2.02 Mcal ME/kg DM and 87 g CP/kg DM). At weaning, one half of lambs from each group was randomly separated and assigned to HQD or LQD. So there were four treatment groups in post-weaning period: H-H (HQD pre- and post-weaning); H-L (HQD pre-weaning and LQD post-weaning); L-H (LQD pre-weaning and HQD post-weaning) and L-L (LQD pre and post-weaning, control group). Weekly DM intake was determined. Serum IGF-1 concentrations was determined by ELISA method. The HQD treatment increased DM intake and BW (body Weight) compared with the LQD treatment during pre-weaning period(P<0.01). At 210 d of age, animals fed LQD during the pre-weaning period and HQD during the post-weaning period (L-H sequence) had greater body length (BL), wither height (WH), hip height (HH) and hip width (HW) than animals on the H-L sequence. No interaction of the two periods was detected for heart girth, HW, WH, BL at 210 d of age (P>0.05). HW at weaning time was not affected by quality of diet. However, lambs of H-H and L-H sequences had a higher increase in HW during post-weaning period compared with lambs of H-L and L-L sequences. Quantity and quality of colostrum was not influenced by pre-pubertal plane of nutrition (P>0.05). Based on the results of current study the authors’ suggestion is that skeletal compensatory growth during post-weaning period can compensate losses caused by poor nutrition during pre-weaning period. And also, the results indicated that skeletal size is a better indication for first-lactation colostrum yield than body weight (BW).
این آزمایش به منظور بررسی تأثیر جیره پیش از بلوغ روی رشد اسکلتی، مرگ و میر بره‌ها، غلظت فاکتور شبه رشد انسولین-1 (IGF-I) و تولید و ترکیب آغوز در بره میشهای کردی انجام شد. چهل رأس بره میش کردی سالم (میانگین سن برابر با 6/8±30 روز، میانگین وزن بدن برابر با 4/3±2/10 کیلوگرم) در دوره قبل از شیرگیری به صورت تصادفی به یکی از دو جیره آزمایشی: جیره با کیفیت بالا (HQD، 50/2 مگاکالری انرژی متابولیسمی در کیلوگرم ماده خشک و 148 گرم پروتئین خام در کیلوگرم ماده خشک) یا جیره با کیفیت پایین (LQD، 02/2 مگاکالری انرژی متابولیسمی در کیلوگرم ماده خشک و 87 گرم پروتئین خام در کیلوگرم از ماده خشک) اختصاص داده شدند. در زمان شیرگیری، نیمی از برههای هر گروه به صورت تصادفی به HQD یا LQD اختصاص یافتند. بنابراین در دوره پس از شیرگیری چهار تیمار وجود داشت: H-H (HQD پیش و پس از شیرگیری)، H-L (HQD پیش از شیرگیری و LQD پس از شیرگیری)، L-H (LQD پیش از شیرگیری و HQD پس از شیرگیری) و L-L (LQD پیش و پس از شیرگیری، گروه کنترل). ماده خشک (DM) مصرفی به صورت هفتگی اندازهگیری شد. غلظت هورمون IGF-I به روش الایزا اندازهگیری شد. تیمار HQD مصرف ماده خشک روزانه و وزن بدن (BW) را در طول دوره پیش از شیرگیری در مقایسه با تیمار LQD افزایش داد (01/0>P). حیوانات تیمار L-H در مقایسه با تیمار H-L در سن 210 روزگی دارای طول بدن، ارتفاع جدوگاه، ارتفاع هیپ و عرض لگن بیشتری بودند. در سن 210 روزگی برای دور سینه، عرض لگن، ارتفاع جدوگاه و طول بدن اثرات متقابل دوره‌ها معنی‌دار نبود (05/0<P). کیفیت جیره عرض لگن را در زمان شیرگیری تحت تأثیر قرار نداد. اگر چه برههای تیمار H-H و L-H عرض لگن بیشتری در مقایسه با تیمارهای H-L و L-L در طول دوره پس از شیرگیری داشتند. کمیت و کیفیت آغوز به وسیله برنامه تغذیه‌ای پیش از بلوغ تحت تأثیر قرار نگرفت (05/0<P). بر اساس نتایج این پژوهش نویسندگان پیشنهاد می‌کنند که رشد اسکلتی تضعیف شده ناشی از فقر جیره در طول دوره پیس از شیرگیری در دوره پس از شیرگیری جبران می‌شود. همچنین نتایج نشان داد که اندازه اسکلتی نسبت به وزن بدن (BW) شاخص بهتری برای تولید آغوز در اولین دوره شیردهی است.
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