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Articles by F. Kafilzadeh
Total Records ( 5 ) for F. Kafilzadeh
  M.R. Targhibi , H. Karami Shabankareh and F. Kafilzadeh
  This study was carried out to evaluate the effects of chromium supplementation as chromium-L-methionine (Cr-Met) on lactation performance and some blood components of Holstein dairy cows in late gestation and early lactation. Sixty multiparous Holstein dairy cows according to prior lactation, parity, body weight and expected calving date were divided equally (30 cows/treatment) and were randomly allocated to one of the two groups. Group 1 received no Cr supplement and served as the control. Group 2, received supplemental Cr at manufacturer’s recommended level (8 mg/head per day) from 21 days before expected calving date until 21 days of lactation. Milk productions of animals were recorded every 15 days until 60 days in milk (DIM). Blood samples were collected at -7, 0 and 21 days relative to actual calving time for determination of serum protein fraction, maternal serum IgG concentration, serum Ca and P and urea nitrogen. Adding chromium to the diet of dairy cows increased milk yield in the first month of lactation. Percentage of lactose and lactose yield increased significantly through the experiment in the supplemented group. In the first month of lactation, milk protein yield increased significantly while a tendency was observed for fat yield in the supplemented group. Cr supplementation increased albumin and albumin to globulin ratio in 21 days postpartum. Maternal serum IgG concentration tended to increase at parturition. Supplemental Cr had no effect on serum Ca, P and urea concentration in periparturient period. The results suggest that Cr supplementation improves milk yield and some blood parameters of dairy cows in late gestation and early lactation.
  N. Mirzaei , F. Kafilzadeh and M. Kargar
  Different mercury contaminated areas of the Kor River were surveyed for detection of mercury resistant bacteria. The samples were collected from four stations throughout the Kor River in four seasons. Amount of total mercury in the samples was determined using cold vapor atomic absorption spectrophotometery. The response of bacterial communities to toxic effects of Hg was monitored by enumerating the number of bacteria on agar containing 10 mg L-1 HgCl2 and with out Hg (II). Isolation of mercury resistant bacteria was performed using the primary enrichment culture method and directly plating on agar containing 10 mg L-1 HgCl2 Hg (II). Total viable counts ranged from 6.5X106 to 2.2X107 cfu g-1 in different stations. Frequencies of mercury resistant bacteria were 42.5% in Pole Khan Station and 3.14% in Droodzan Station. These stations were the most contaminated and uncontaminated areas of the Kor River, respectively. Pseudomonas sp., E. coli, Serratia marcescens, etc. was identified as mercury resistant bacteria. Using the primary enrichment culture method has permitted more effective isolation of Hg resistant bacteria. Present results showed that enhancement of mercury pollution in the environment will increase the probability of the isolation of Hg resistant bacteria.
  G. Taasoli and F. Kafilzadeh
  This experiment was conducted to study the effect of ensiled and dried Apple Pomace (AP) obtained from puree making on finishing performance of lambs. Digestibilities of both ensiled and dried AP were determined using 4 mature sheep. In finishing experiment, 18 Sanjabi male lambs were used (9 per treatment) in a 120 day finishing experiment which was divided into two periods (60 day each). In the first period the ensiled AP and in the second period the dried AP were fed in an iso caloric, iso nitrogenous total mix ration. The Dry Matter (DM), crude protein and neutral detergent fiber of ensiled and dried AP were 247.1, 63.85, 386.4 g kg-1 DM and 888.4, 51.2, 385.6 g kg-1 DM, respectively. No significant difference was observed in the apparent digestibility of ensiled and dried AP. The apparent DM digestibilities of ensiled and dried AP were 704.3 and 668.2 g kg-1 DM, respectively. Feeding ensiled AP significantly increased Dry Matter Intake (0.938 vs. 0.803 kg day-1), Average Daily Gain (ADG) (199.8 vs. 155.56 g) and Feed Conversion Ratio (FCR) (4.69 vs. 5.16). Use of dried AP had no significant effect on DMI (1.030 vs. 0.932 kg day-1) but significantly improved the ADG (192.3 vs. 123.82 g) and FCR (5.36 vs. 7.52). Apple pomace increased carcass dressing percentage but had no effect on the percentage of different cuts. Results of this study suggest that AP, in both ensiled and dried forms, can improve the performance of finishing lambs.
  S. Payandeh and F. Kafilzadeh
  This experiment was conducted to determine the effect of yeast (Saccharomyces cerevisiae, SC47) on finishing performance, digestibility, some blood metabolites and carcass characteristics of male lambs fed a diet based on dried Molasses Sugar Beet-Pulp (MSBP). Eighteen Sanjabi male lambs (20.95±2.7 kg initial body weight and 3 month of age) were used in a completely randomized design. Animals were assigned to one of the two dietary treatments (with or without yeast). Digestibility and nitrogen balance experiment was carried out using six mature rams on finishing diet with and without yeast. Serum metabolites were determined in samples taken from lambs at the end of finishing period. Dry matter digestibility of finishing diet was significantly increased by yeast addition. However, yeast did not have any significant effect on apparent digestibility of OM, NDF, CP and energy. Nitrogen retention was also not affected by yeast addition. Yeast resulted in a significant increase in the average daily gain, dry matter and organic matter intake. However, feed conversion ratio was not significantly affected by addition of yeast. The concentration of the serum metabolites including glucose, urea, cholesterol, sodium, potassium, calcium, phosphorous and cratinine were not affected significantly by yeast supplementation, but triglyceride concentrations increased significantly when yeast was fed. Addition of yeast to the diet did not have any significant effect on the carcass characteristics. Results of this study suggest that feeding saccharomyces cerevisiae with a diet based on MSBP can improve the performance of fattening lambs without any change in carcass characteristics or cuts.
  F. Kafilzadeh and N. Mirzaei
  Different bacterial species were isolated from different areas of the Kor River and growth pattern of these bacteria were evaluated. In this study the samples were collected from four stations throughout the Kor River in four seasons. Isolation of mercury resistant bacteria was performed using the primary enrichment method and directly plating on agar containing Hg(II). Growth kinetics of most mercury resistant and sensitive bacteria were studied in LB broth containing 20 mg L-1 HgCl2 per liter. Pseudomonas sp., E. coli, Serratia morcescens, etc. was identified as mercury resistant bacteria. Isolated bacteria from the most mercury polluted stations showed high levels of resistance to this toxicant. Growth curve of mercury resistant bacteria was obtained the same as the standard growth curve of bacteria. Present results showed that enhancement of mercury levels in the environment will increase the levels of resistance to mercury among the bacterial communities residing in this contaminated sites.
 
 
 
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