تاثیر محدودیت مصرف پروتیین در دوره آخر آبستنی بر وزن تولد، سرعت رشد و غلظت خونیهورمونرشدشبه-انسولین،انسولین، اوره و گلوکز دربره هایشیرخوار

In this study the effects of late gestational protein restriction (lgpr) on birth weight, growth rate and plasma concentrations of insulin-like growth factor-1 (igf-i), insulin, urea and glucose in subsequent sucking lambs was investigated. forty eight singe-bearing ewes from indigenous lori-bakhtiary sheep were fed iso-energetic diets either with 12.5% (control; n=24) or 8.6% (restricted; n=24) crude protein from day 105 until parturition. ewes were fed ad-libitum after parturition. lambs birth weight, morphological characteristics (head size, body length and height), and growth rate and feed conversion rate until age of one-month were recorded. blood samples were taken at birth, 4, 10 and 15 days of age and were analyzed for igf-i, insulin and urea and glucose. lgpr decreased lambs birth weight (p < 0.05) but had no significant on morphological characteristics (p > 0.05). glucose plasma concentrations were the lowest on birth day (p < 0.05) and increased with age. insulin values did not significantly differ between control and restricted lambs (0.97vs. 1.20µg/dl). igf-i values were not affected by lgpr with 204 and 213 ng/ml for restricted and control lambs respectively. urea concentrations were 45 and 43 mg/dl for control and restricted lambs respectively. urea values at age 15 were significantly lower in restricted (29mg/dl) in comparison to control lambs (41mg/dl). in conclusion lgpr born lambs showed lower birth weight and lower plasma urea concentration which might be a sign of better protein metabolism in subsequent suckling lambs.