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Articles by M.A. Norouzian
Total Records ( 4 ) for M.A. Norouzian
  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.A. Norouzian and M. Nosrati
  This study was conducted to determine laminitis prevalence and evaluation of production and economic loss resulting to this disorder with use 100 Holstein cows in summery season. Cows distribute in 3 groups, High (H), Mild (M) and Low (L) producing with milk yield of 35 (SD 4.2), 26 (SD 3.6) and 18 (SD 3.4) kg and total number of cows in each group 26, 52 and 22 cows, respectively. Locomotion scores determined within each group with use back line and gait characteristics according to Sprecher’s method. In this method, cows divided to 5 score where a score 1 show a cow that walks normally and a score of 5, a cow that is 3-legged lame. Scores 2 and 3 settled in subclinical and scores 4 and 5 considered to represent clinical group. Decrease of milk production and economic loss resulting to laminitis determined by Loss Calculator Software. Results indicated that the most number of normal; subclinical and clinical dairy cows were in L, M and H groups, respectively. Laminitis frequency, production and economic loss in H and M groups were greater than the L group. Milk production loss for H, M and L groups, were 0.98, 0.68 and 0.26 kg/cow/day. Also, economic loss was 791.4 US$ monthly, in dairy. This study showed that laminitis is important factor that affect production and incoming in Iranian dairy farms.
  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.
  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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