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Articles by R. Valizadeh
Total Records ( 7 ) for R. Valizadeh
  M.A. Norouzian , R. Valizadeh , F. Azizi , M. Hedayati , A.A. Naserian and F. Eftekhari Shahroodi
  Sixteen Holstein dairy cows with the average live body weight of 652±43 and daily milk yield of 32.9±2.4 kg allocated to 4 treatments in a complete randomized design with 4 replications to evaluate the effect of iodine supplementation on performance of dairy cow and iodine excretions especially in milk. The treatments were: basal diet (without Potassium Iodide) as the control diet, 2, 3 and 4, the basal diet plus 2.5, 5 and 7.5 mg kg-1 diet DM Potassium Iodide, respectively. There were no significant difference between treatments for dry matter intake, milk yield and compositions and the milk production efficiency. Iodine contents in blood, urine, raw and pasteurized milk were significantly (p<0.01) affected by the iodine supplementation. Blood T3 and T4 concentrations were not significantly affected by the treatments. No adverse effect of iodine supplementation on performance and health of dairy cow were detected in this study. It was concluded that iodine supplementation above of NRC recommendation (0.5 mg kg-1 diet DM) led to a desirable level of iodine in the milk ready for human consumption without adverse effects on dairy cows performance and health. This finding could be an excellent recommendation for the area with iodine deficiency mainly for children's.
  M. Vatandoost , M. Danesh Mesgaran , R. Valizadeh and H. Nasiri Moghaddam
  Whole Crop Corn (WCC), Triticale (WCT) and Barley (WCB) were harvested, chopped and ensiled with urea (15 g kg 1 DM) for 45 days. pH of WCT Silage (WCTS) and WCB Silage (WCBS) was similar, but, significantly differed from WCC Silage (WCCS) (p< 0.05). Crud Protein (CP) (WCCS = 67.2, WCTS = 112.4 and WCBS = 96.4 g kg 1. DM), Non-Protein Nitrogen (NPN), (WCCS = 6/84, WCTS = 16.85 and WCBS = 15.04 mg dL 1) and Neutral Detergent Fiber (NDF), (WCCS = 436, WCTS = 497 and WCBS = 470 g kg 1 DM) were significantly different between treatments (p< 0.05). The results of the incubation of WCCS, WCTS and WCBS using nylon bag technique showed that quickly degradable fraction (a) of Dry Matter (DM) was relatively high for WCTS (0.37±0.01) and intermediate for WCBS (0.32±0.02) and lowest for WCCS (0.24±0.01). Whereas, the slowly fraction (b) for WCTS (0.44±0.02) and WCBS (0.52±0.04) was similar and higher than WCCS (0.54±0.02). The constant fractional rate of degradation (c) of CP for the silages was similar (0.02). In this experiment, the effect of replacing WCCS with WCTS or WCBS on feeding the lactating cows was also investigated. Fifteen Holstein lactating cows (37.1±4.9 kg milk/d) were used in a completely randomized design for 6 weeks. Data were analyzed as repeated measures in time. Cows fed diet containing WCBS had higher feed intake than the cows of the other groups (p< 0.05). Milk yield and component (protein, lactose, Urea Nitrogen (MUN) and total solid milk) were not affected significantly by the treatments. Blood glucose in mid and end of the experiment in each sampling time (0.0 and 4 h) after feeding was not affected by the treatments, but, this metabolite decreased at the 4 h after feeding. Blood Urea Nitrogen (BUN) in the mid the (4 h) and end of the experiment (before feeding) was significantly affected by treatments (p< 0.05).
  M. Kazemi , A.M. Tahmasbi , R. Valizadeh , M. Danesh Mesgaran and A.A. Naserian
  An experiment was carried out to evaluate the substitution of Barley distillers' Grains (BG) ensiled by different level molassed sugar Beet Pulp (BP) with of corn silage on milk production and health of dairy cows. A total 18 Holstein dairy cows (86±10 days postpartum 600±20 kg BW), were randomly assigned to 3 treatments in a balanced completely randomized design (repeated measures). Three diets were formulated to evaluate the replacement of 30% corn silage by an ensiled mixture of BG with and without BP. Treatments were an ensiled mixture of 60% BG with 40% BP (BGBP40%), an ensiled mixture of 80% BG with 20% BP (BGBP20%) and BG ensiled without BP (BGBP0%). Experimental diets contained, 40% forage (60:40, corn silage: Alfalfa hay) and 60% concentrate. Cows were fed a total mixed ration and milked 3 times daily. Diet concentrations of NDF, ADF and CP were 33.2, 19.6 and 16.4% DM (for BGBP40%), 33.7, 20 and 16.8% DM (for BGBP 20%) and 33.8, 20.5 and 16.8% DM (BGBP 0%), respectively. The feed intakes, daily milk yield and milk composition were not significantly different between treatments. There was no significant effect of treatments on rumen pH and NH3-N. Also, there was no significant effect on blood plasma metabolites. Partial substitution BG ensiled with or without BP for corn silage did not have any negative effect on the performance of Holstein dairy cows.
  R. Valizadeh , M. Madayni , S. Sobhanirad , M. Salemi and M.A. Norouzian
  This research investigated the feeding value of Kangar (Gandelia tournefortii) hay and the effect of diets containing this hay on growth performance of Baluchi lambs. Kangar hay was collected from the Khorasan natural rangeland at the stage of late maturity and evaluated in terms of chemical composition, in sacco degradability and a growth study with lambs. Twenty-four male and 24 female lambs were allocated to 4 dietary treatments in a feedlot condition. All groups received a concentrate mixture of 60 and 40% roughage including alfalfa hay (25%), dry wheat straw (15%), soaked what straw (15%), dry Kangar hay (15%) and soaked Kangar hay (15%) as treatments 1-4, respectively. Chemical composition mainly CP of Kangar hay was much higher than wheat straw and even comparable to alfalfa hay. The average DM degradability of Kangar hay was 67.2% after 120 h incubation, but >76% of the incubated DM degraded during the 1st 24 h. These values for CP and NDF were 73.5 and 54.5%, respectively. These parameters ranked Kangar hay as medium-quality forage. Male lambs fed by TMR containing the soaked Kangar hay gained better than other groups. Average daily gains of male and female lambs on dietary treatments of 1-4 were 218, 237, 241, 276 and 197, 215, 229 and 259 g, respectively. The best feed conversion ratio was also recorded for the male lambs on diet containing 15% soaked Kangar hay (6.5 kg feed consumed kg-1 of weight gain). The mean dressing percentage for the lambs allocated to treatments 1-4 were 54.7, 54, 9, 53.4 and 53.5 for males and 53.1, 52.7, 54.0 and 55.7 for females, respectively. It was concluded that inclusion of Kangar hay can be beneficial mainly for smallholder farmers during periods of low rainfall and forage scarcity.
  R. Valizadeh , S. Sobhanirad and M. Mojtahedi
  Chopped and pressure-pasteurized wheat straw in the form of compost was seeded with mushroom mycelium. Chemical composition, ruminal disappearance and in vitro gas production were carried-out on the samples taken on day 0, 21, 42, 63 and 84 after seeding. NDF, ADF and Lignin content of the treated wheat straw reduced significantly with a rate of 0.20, 0.10 and 0.04% per day. Crude protein content increased significantly from 46.6 g kg-1 on day 0-50.90 g kg-1 on day 84. The a fraction for dry matter was highest (p<0.05) for the straw under the mushroom growing conditions (e.g., 0.188 g g 1 for the day 0 and 0.342 for the day 84). In contrast, the b value significantly (p<0.05) reduced from day 0-84 (0.487 and 0.336 g g 1). The value for crude protein and NDF parameters increased linearly with increasing the growing period. Generally, the ruminal disappearance of different nutrients increased by growing the Pleurotus ostreatus, although, the c rate was independent. In case of gas production, mushroom growing led to a significant more gas production during the early hours (less than 24 h) of incubation. The b fraction of in vitro gas production as well as in situ results reduced significantly from day 0-84. It was concluded that straw seeding with P. ostreatus can be more effective for the longer period of growth.
  A. Hosseinkhani , R. Valizadeh , A. Naserian , M.D. Mesgharan and F.E. Shahroodi
  A study was conducted to evaluate the effect of two levels of hay particle size and diet DM on dairy cows performance in barley base diets. Eight cows in early lactation stage were allocated to four dietary treatments in a change over design with factorial arrangement of 22 including two levels of alfalfa particle size (5 and 20 mm) and two levels of TMR dry matter (without and with adding water up to 50% DM). Diets were similar in net energy content and chemical composition. Water addition resulted in reduction in percentage of diet particles in the pan and increasing physical effective factor (pef) in both levels of alfalfa particle size (p<0.01). Experimental treatments had no effect on milk production although a trend of milk fat reduction was observed with reduction of the hay particle size (p = 0.06). Milk protein, Lactose and SNF content of the produced milk were not influenced by the treatments. Milk production efficiency was showed a trend to change with diet DM changes (p = 0.06). Blood pH and bicarbonate content, NH3-N concentrations and fecal pH were not affected by the treatments but water addition resulted in significant reduction in ruminal pH (p = 0.02). TMR particle size had no effect on eating time, but in the wet diets a significant reduction in eating time of peNDF (min kg-1) (p = 0.02) and eating time of NDF (min kg-1) (p = 0.05) was found. Conversely hay particle size reduction significantly decreased rumination time when expressed as min day-1 (p = 0.02) and min kg-1 of diet NDF (p<0.01). Treatments had no effect on feces particle size, body weight, DMI and NDF intake by the cows.
  M.A. Norouzian , R. Valizadeh and F. Aziz
  In study that was conducted for investigation of relationships between iodine intake by lactating Holstein cows and iodine concentrations in milk, 16 Holstein dairy cows with the average live body weight of 652?43 and daily milk yield of 32.9?2.4 kg allocated to 4 treatments in a complete randomized design with 4 replications to evaluate the effect of heating in pasteurization process on milk iodine content. The treatments were basal diet (without Potassium Iodide) as the control diet, 2, 3 and 4, the basal diet plus 2.5, 5 and 7.5 mg kg-1 diet DM Potassium Iodide, respectively. Iodine contents in raw and pasteurized milk were significantly (p<0.01) affected by the iodine supplementation. Pasteurization of milk by HTST method result in average decrease of iodine 27.15?7.13%. The amounts of iodine were 142.61, 430.86, 545.43, 593.32 and 67.43, 306.94, 367.56, 466.88 ?g L-1 for raw and pasteurized milk and different treatments, respectivley. High amount of iodine in free form in milk cause to decrease of iodine content after heating in pasteurization process.
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