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Articles by A.H. Samie
Total Records ( 5 ) for A.H. Samie
  G.R. Ghorbani , A. Jafari , A.H. Samie and A. Nikkhah
  Scarcity of data exists on potential use of exogenous enzymes for young calves. The objective of this study was to assess the effects of applying Exogenous Non-starch Polysaccharidases (ENP) to pre-weaning starter concentrate on starter intake, nutrient digestibility and calf growth. Eighteen neonatal Holstein calves (47.9±2.5 kg body weight) were monitored for 84 day. Treatments included pre-weaning calf starters with 1) no enzyme additives (C), 2) enzyme additive A (EA, 0.6 mL kg-1 starter), or 3) enzyme additive B (EB, 1.9 mL kg-1 DM of starter). The activity of endo-cellulase, exo-cellulase and xylanase was measured using carboxymethyl cellulose, filter paper test and oat spelt, as the respective substrates. The resulting activity (μ mol/mL/min) of exo-cellulase, endo-cellulase and xylanase were respectively 1437, 788 and 7476 for EA and 1446, 1350 and 5091 for EB. No enzymes were added to post-weaning diet. Weaning Criterion (WC) was defined as the calf age at a daily intake of 680 g starter and estimated with regression equations. Mixed models of repeated measures with best fitted covariance structures were used to analyze the data. The calves fed EA-supplemented starter had higher NDF apparent total tract digestibility at week-4, but not at week-8, compared to control and EB-fed calves. However, NDF digestibility was lower at week-12 in ENP-fed calves than in control calves. The ENP did not affect the average daily starter intake, growth rate and WC. Overall, applying ENP to pre-weaning calf starter did not improve calf performance in this study. Further studies preferably using a mixture of cell-content and cell-wall polysaccharidases in both pre- and post-weaning starters would be warranted.
  M.R. Ebadi , J. Pourreza , J. Jamalian , M.A. Edriss , A.H. Samie and S.A. Mirhadi
  In order to assess and determine amino acids profile and availability in different sorghum grain (SG) varieties, three SG varieties including low tannin (0.09%, LTS), medium tannin (0.19%, MTS), and high tannin (0.37%, HTS) were grown in the same location. The grains were analyzed for their proximate analyses, tannin, and amino acids. True amino acid availability (TAAA) was obtained by caecectomized single comb leghorn cockerels and Sibbald`s method. The results showed that the first and the second limiting amino acids in LTS and MTS were methionine and cystine, respectively. Whereas in HTS, lysine (0.166%) was the first and methionine (0.176%) was the second limiting amino acid. Methionine contents in LTS, MTS, and HTS were 0.114%, 0.182%, and 0.176%, respectively. Although crude protein was lower in HTS (10%) than the other SG, histidine, methionine, and isoleucine were higher for HTS as compared to LTS and MTS. TAAA decreased when tannin content increased and all amino acids had a lower availability in HTS than in LTS and MTS (p<0.05). Methionine in HTS and LTS had the highest availability as had glutamic acid in MTS. The availability of proline was most affected by tannin, which was 91.55% for LTS, 84.82% for MTS, and 22.82% for HTS (p<0.05).
  A. Pishnamazi , J. Pourreza , M. A. Edriss and A.H. Samie
  An experiment was conducted to investigate the effect of genotype (meat-type or egg-type) on the AME digestibility of selected ingredients. The practice of using only one value for apparent metabolizable energy (AME) of feed ingredients for all classes of poultry has been questioned. The ability to convert nutrients to the final products depends on a variety of factors, such as age, sex, genetic and housing system. Some studies have indicated that broiler breeders are less able to metabolize diet energy, than are Leghorn birds. In this study, the ingredients included samples of cereals (corn, wheat and barley), one sample of plant protein (soybean meal) and one cereal by-product (wheat bran). Forty adult males (20 per breed) were randomly assigned to five feedstuffs. Each feedstuff was fed to four birds per breed. The AMEn values were determined using a classical total collection method (Sibbald method). The AME of each feed ingredient was calculated from the difference between GE intake and GE losses in the droppings. The AME values were corrected to zero nitrogen balance (AMEn). The results were showed the average AMEn digestibility in wheat (egg-type : 2785, Kcals/Kg ; meat-type : 2750 Kcals/Kg) and barley (egg-type : 2715 Kcals/Kg; meat-type : 2675 Kcals/Kg) samples were similar in two breeds. The AMEn digestibility in White Leghorn birds was significantly greater for corn (egg-type : 3065 kcals/Kg ; meat-type : 2842 kcals/Kg) , soybean (egg-type : 2185 Kcals/Kg ; meat-type : 2040 Kcals/Kg) and wheat bran (egg-type : 1440 Kcals/Kg ; meat-type : 1333 Kcals/Kg) compared to the broiler strain. In this study, considerable differences were also noted between the two breeds that were tested in their ability to utilize the AME of feed ingredients. In mature broiler breeder hens excess ME intake can cause fat deposition; consequently, accurate representation of the energy content of a breeder diet is important. On the other hand, deficiencies of energy around the time of peak egg production will likely reduce egg production at this time, or production will fall after peak by definition. Since tables concerning ingredient composition usually contain ME values determined with White Leghorn, further research is needed if energy content of broiler breeder diets is accurately represented.
  J. Pourreza , A.H. Samie and E. Rowghani
  The influence of enzyme supplementation on performance and digestibility of dry matter and protein in young broiler chicks was examined for a diet based on triticale supplemented with different levels of enzyme. In a completely randomized design, two hundred d-old chicks (Ross strain) were divided into 20 groups, ten chicks per group. A basal diet containing 65% triticale was supplemented with zero, 100, 200, 400 and 800 g/kg enzyme and given to four replicates for 21 days. Added enzyme (xylanase) improved (P< 0.05) body weight, body weight gain, feed intake and feed conversion ratio. Apparent digestibilities of energy and protein were increased (P< 0.05) due to supplemental enzyme. Non-significant improvement was observed in protein and energy efficiencies by the addition of enzyme. All improvements had a similar trend and were the highest at 200 g/kg enzyme supplementation. Higher levels of enzyme had no beneficial effect on measured criteria. The results indicated that the nutritional value of cereal grains such as triticale can be improved by supplemental enzyme containing mainly xylanase to the diet of young broiler chicks.
  A. Nouri Moghadam , J. Pourreza and A.H. Samie
  The present experiment was carried out on 405 broiler chicks (Arian strain) over a period of two weeks (from 8 to 21 days of age) to investigate the effects of different levels of dietary citric acid and phosphorus on calcium and phosphorus requirements in broiler chicks and on their performance. The experiment was a 3 x 3 factorial one including three levels of zero, 1.5 and 3% citric acid as well as three levels of 0.3, 0.35 and 0.4%, respectively dietary phosphorus in a completely randomized design. Thus, 9 experimental diets were prepared, each of which was randomly administered to three groups of the chicks (three replications for each diet). The effects of different levels of citric acid and phosphorus as well as their interactive effects on body weight, daily feed consumption, feed conversion efficiency, feed/gain ratio, weight percentage of body parts, percentage of bone ash, calcium and phosphorus percentages in bone ash and plasma inorganic phosphorus and calcium were assessed and determined. The results showed that the effects of different levels of citric acid on body weight (p<0.05), feed consumption, calcium and phosphorus concentrations in bone ash and plasma (p<0.01) were significant but that they had no significant effects on bone ash percentage, feed conversion efficiency and feed/gain ratio. The effects of different levels of phosphorus on body weight, daily feed consumption, bone ash percentage, plasma calcium and phosphorus percentages (p<0.01) and bone ash phosphorus percentage (p<0.05) were significant while no significant effects were observed in the case of feed conversion efficiency, feed/gain ratio and plasma calcium. The interactive effects of citric acid and phosphorus on 21-day body weight, bone ash percentage (p<0.05), feed consumption, bone ash calcium percentage, bone ash phosphorus percentage (p<0.05), plasma phosphorus and calcium (p<0.01) were significant while they had no significant effects on other parameters measured. From the results obtained, it seems that citric acid plays a role in calcium and phosphorus utilized by poultry and may increase the absorption of these minerals.
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