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Articles by N. Ziaei
Total Records ( 2 ) for N. Ziaei
  N. Ziaei , M. Shivazad , S.A. Mirhadi and A. Gerami
  The aim of this experiment was to examine the potential for reduced environmental impact by reducing dietary calcium and phosphorus content and phytase addition of laying hen diets. A randomized complete block design with a 2x2x2 factorial arrangement of 8 dietary treatments: 2 levels of phytase (0 and 300 FTU kg-1) and 2 mineral levels (Ca: 34/18 and NPP: 3.2/2.2 g kg-1, respectively). A total of 240 White Leghorn (WL) layers, 25 weeks of age were used. Considering birds in 12 cages as a replicate, 5 such replicates were randomly allotted to each dietary treatment. Individual body weight of the bird was recorded at the beginning and end of the experiment. Egg production on an individual basis was recorded daily and percentage hen day egg production was calculated. The cleaned eggshells were dried for 24 h, weighed and expressed as percentage of whole egg. One bird from each experimental unit were selected at random and killed by cervical dislocation at the end of the experiment and the left tibia was removed. Dried bone samples were ashed at 680° C for 12 h for estimation of bone ash. The results of this experiment showed that reducing Ca and NPP (Non-Phytate Phosphorus) without phytase decreased BWG (Body Weight Gain), feed intake, FCE (Feed Conversion Efficiency), egg production, egg shell weight and tibia ash. However, phytase addition to low mineral diets completely corrected the adverse effects associated with low dietary Ca and NPP. It can therefore be concluded that reducing levels of Ca and NPP below current standards and phytase supplementation can reduce pollution potential from laying hen production without adversely affecting bird performance or welfare.
  N. Ziaei and S.M.M. Sharifi Hosseini
  The aim of this study was to evaluate the feeding value and also the effect of different supplementary energy on increasing in vitro DM digestibility of date-palms leaves obtained in pruning. A randomized complete design with different energy supplementary with 3 replicates was conducted. Harvested date-palm leaves were air-dried, ground through a 5 mm screen, then palm leaves (L) ensiled with different levels of urea (U) and other supplementary energy. Combination, mixture was packed tightly in 21 (10 L) plastic containers. The containers were opened after a fermentation of 60 days. Treatments consisting: L (Palm leaves)+5% U (urea) (T1), L+5% U+5% BP (Beet pulp) (T2), L+5% U+10% BP (T3), L+5% U+5% M (Molasses) (T4), L+5% U+10% M (T5), L+5% U+5% CP (Citrus pulp) (T6) and L+%5 U+10% CP (T7). The results of this experiment showed that supplementation of date-palm leaves with energy supplements significantly (p<0.05) increased IVDMD and T5 had higher digestibility than those of the other treatments. ADF content of silage was not affected by dietary treatments. However, NDF content was significantly (p<0.05) affected by treatments and T2 and T6 had higher NDF content compared with the other treatments. Supplementation of palm leaves with energy supplementary had no significant effect (p>0.05) on Crude Protein (CP) content of silages. However, these supplements had a significant effect (p<0.05) on calcium and phosphorus levels of silage materials and T7 had higher Ca and P content compared with the other treatments. In conclusion, supplementation of date-palm leaves with energy supplements can improve IVDMD and feeding value of this feed source.
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