Effect of Pre-Pubertal Plan of Nutrition on Reproductive Performance, Hormone Concentrations and Milk Production in Kurdish Female Lambs
محورهای موضوعی : Camelص. منتیان 1 , ح.ر. میرزایی الموتی 2 , ف. فتاح نیا 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: Hormone, Milk, reproductive performance, Kurdish lambs, nutrition plan,
چکیده مقاله :
To determine the value of pre-pubertal plan of nutrition on reproductive performance, hormonal concentrations and milk production 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) (HQD, 2.50 Mcal ME/kg dry matter (DM) and 148 g CP/kg DM) or low quality diet (LQD) (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. 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). Dry matter intake was measured weekly and body weight (BW) and average daily gain (ADG) were measured every 2 weeks from 30 to 210 d of age. Serum insulin, leptin and progesterone concentrations were determined by ELISA. In general, the HQD treatment increased dry matter intake (DMI), compared with the LQD treatment during pre-weaning period (P<0.01). Results showed that initial BW was similar between all experimental groups (P>0.05). During post-weaning, lambs of H-H treatment had higher DMI, metabolize energy (ME) and crude protein (CP) intake compared with other lambs treatments (P>0.05). Within the post-weaning, serum progesterone concentrations was greater for ewe lambs fed at H-H group than for other groups (P<0.05). Serum insulin concentration was affected by the diet quality at both periods (P<0.05). Leptin concentration was affected by treatment and ewe lambs of L-H group had higher leptin concentrations (P<0.05). Age at the time of puberty was affected by treatments (P<0.05). In addition, Ewe lambs in the H-H and L-H groups were younger and weighed more at puberty. Diet plan in the pre-pubertal period was affected milk yield at the first lactation (P<0.05). It was concluded that pre-pubertal plan play an important role in secretion of progesterone, insulin and leptin, which can leads to early sexual puberty. And also these strategic plans should be improve economic traits the start of lamb’s puberty in sheep husbandry.
به منظور بررسی تأثیر جیره پیش از بلوغ روی عملکرد تولیدمثلی، غلظت هورمونها و تولید شیر در بره میشهای کردی، چهل رأس بره میش کردی سالم (میانگین سن=6/8±30 روز، میانگین وزن بدن= 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. وزن بدن (BW) و میانگین افزایش وزن روزانه (ADG) هر دو هفته یک بار از سن 30 تا 210 روزگی اندازهگیری شد. غلظتهای سرمی انسولین، لپتین و پروژسترون به روش رادیو-ایمونو-اسی اندازهگیری شد. در طول دوره پیش از شیرگیری جیره HQD در مقایسه با LQD ماده خشک مصرفی (DMI) را افزایش داد (01/0>P). نتایج نشان داد که وزن اولیه بین گروههای آزمایشی مشابه بود (05/0<P). در پس از شیرگیری، برههای تیمار H-H، ماده خشک ، انرژی متابولیسمی و پروتئین خام مصرفی بیشتری نسبت به سایر تیمارها داشتند (05/0>P). غلظت سرمی پروژسترون در برههای تیمار H-H در پس از شیرگیری نسبت به سایر گروهها بیشتر بود (05/0>P). غلظت سرمی انسولین در هر دو دوره به وسیله کیفیت جیره تحت تأثیر قرار گرفت (05/0>P). غلظت لپتین به وسیله تیمارها تحت تأثیر قرار گرفت و برههای گروه L-H غلظت لپتین بیشتری داشتند (05/0>P). سن در زمان بلوغ به وسیله تیمارها تحت تأثیر قرار گرفت (05/0>P). به علاوه بره میشهای تیمارهای H-H و L-H در سن پایینتر و وزن بالاتری به بلوغ رسیدند. جیرههای پیش از بلوغ، میزان تولید شیر در نخستین دوره شیردهی را تحت تأثیر قرار دادند (05/0>P). در مجموع چنین نتیجهگیری میشود که جیرههای پیش از بلوغ نقش مهمی در ترشح پروژسترون، انسولین و لپتین دارند، که منجر به بلوغ جنسی میشوند. و همچنین این برنامههای استراتژیک با تسریع شروع بلوغ بره میشها در پرورش گوسفند، باعث بهبود بازده اقتصادی میگردد.
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