RT - Journal Article T1 - Effects of Increasing Level of Metabolizable Energy and Protein on Feed Intake, Nutrient Digestibility, Performance and Blood Metabolites of Zell Pregnant Ewes at Late Gestation JF - rap YR - 2018 JO - rap VO - 9 IS - 22 UR - http://rap.sanru.ac.ir/article-1-926-en.html SP - 60 EP - 71 K1 - Nutitional Manipulation K1 - Energy Balance K1 - Pregnancy K1 - Zell Ewe AB - The aim of this experiment were Evaluation of Nutritional Manipulation on Digestibility, Performance and Blood Biochemical Properties in Zell Pregnant Ewes before Lambing, 32 pregnant ewe (mean body weight 42±1 kg, 2.5 years-old, multiparous, 100 days of pregnancy) were used in completely randomized design with 4 treatment and 8 replicate. Treatments were included: 1) diet adapted to the requirement of pregnant ewes in accordance with the metabolizable energy and protein recommended in (NRC, 2007) on the 100th day of pregnancy (control). 2) diet with a high level of metabolizable energy (+10NRC) with corn. 3) diet with the high level of metabolizable energy (+10NRC) with Micro-capsulated flax seed. the diet with the high level of metabolizable protein (+10NRC) with Lys and Met. The results showed Changes in nutrient levels could significantly increase the Nutrient consumption and digestibility (P <0.05). The treatments with synthetic amino acids had the highest nutrint consumption and digestibility. The effects of experimental treatments on rumen fluid pH and volatile fatty acids were not significant (P >0.05). Ammonia nitrogen content of ruminal fluid was significantly higher in control (P<0.05). The effects of nutritional manipulations prevented loss of weight and physical condition of livestock (P <0.05). the treatments with the high level of metabolizable energy were able significantly to avoid to reduce energy carriers and also reduce the level of ketone bodies and Non Esterified Fatty Acids in blood metabolites (P<0.05).in conclusions, according to results of this study increasing levels of metabolizable energy and protein in raions could be prevented to negative energy balance and metabolic disorders in pregnant ewes at late gestation. LA eng UL http://rap.sanru.ac.ir/article-1-926-en.html M3 10.29252/rap.9.22.60 ER -