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Articles by K. Rezayazdi
Total Records ( 4 ) for K. Rezayazdi
  S.R. Heidari Khormizi , M. Dehghan Banadaky , K. Rezayazdi and A. Zali
  Twenty four Holstein cows in early lactation (days in milk: 24±4) were allocated equally to one of four treatments. Treatments were as follows: control basal diet without supplement; LY basal diet supplemented with 10 g of live yeast; ANX basal diet supplemented with 30 g of Aspergillus niger extracted meal and LY+ANX basal diet supplemented with 10 g LY and 30 g ANX. Daily individual milk production and feed intake recorded and weekly milk samples were taken for milk composition analyse. Fecal grab samples were collected during 3 consecutive days at the end of experiment period from each cow. The experimental period lasted 75 days. Milk production was improved by 6.8% for group fed the LY compared control diet (p<0.05). Fat-corrected milk, feed efficiency, body weight and body condition score changes and DM intake were similar between groups. Greater protein yield and percentage were observed in the LY and LY+ANX groups compared to the control group (p<0.05). No differences were observed in other milk composition between groups. The apparent digestibility of DM and OM were higher (p<0.05) in the LY+ANX supplemented diet compared to the control. Similar to DM and organic matter digestibility, greater NDF apparent digestibility was observed in the LY+ANX supplemented diet versus the control that might be due to synergistic effects of feeding LY and ANX together. We concluded that LY might have potential as an effective direct-fed microbial to increase milk production in early lactating cows.
  M.R. Dehghani , K. Rezayazdi , M. Dehghan-Banadaky and H. Mansoori
  The aim of this experiment was to study the effect of fibrolytic enzyme on milk yield and composition, rumen microbial count and pH and blood metabolites of fifteen multiparous lactating cows (DIM 30±10 days). The experimental diets include: Control (based diet with no enzyme), basal diet with 2.5 g enzyme/kg of DM and basal diet with 5 g enzyme/kg of DM. Change-over design were used with three period, three treatments and five cows allocated to each diet. Individual dry matter intake and milk yield daily recorded and milk samples were taken for milk constituents analyze in each period. Rumen fluid collected for determining of pH and microbial count from each cow in every period at 0 and 4 h after feeding. Results indicated that low level of enzyme (2.5 g kg-1 of DM) increased milk production and 3.5% FCM compared to the other groups (p≤0.05). However, milk compositions were not affected by enzyme. Cows consuming high level of enzyme (5 g kg-1 of DM) had higher dry matter intake compared to the other groups (p≤0.01). Cows consuming high level enzyme had significantly lower milk efficiency compared to the other groups (p≤0.05). Enzyme had no effect on rumen pH and microbial (bacteria and protozoa) growth at 0 and 4 h after morning feeding. Furthermore, diet with low level enzyme increased plasma glucose concentration of dairy cows (p≤0.05). Results showed that low level of enzyme (2.5 g kg-1 of DM) can be recommended in the diet of early lactation Holstein cows.
  M. Ardalan , K. Rezayazdi and M. Dehghan-Banadaky
  Twenty Holstein dairy cows in their first and second lactation were used from 4-week prepartum through 20-week postpartum. The aim was to investigate the effect of feeding different levels of ruminally protected methionine and choline on health situation and reproductive indices of Holstein dairy cows. Cows were randomly assigned to receive one of the following treatments: 18 g day-1 of rumen protected methionine (RPM), 60 g day-1 of rumen protected choline (RPC), 18 g day-1 of RPM +60 g day-1 of RPC and neither supplement (control). The treatments significantly affected services per conception and open days of lactating dairy cows, but did not significantly affect on days to first estrus and number of pregnant cows. RPM+RPC-fed cows had the lowest open days, days to first estrus and services per conception compared with other groups. Although no statistical differences were noted for any given health category, the overall incidence of health-related disorders was numerically lowest for cows fed RPM+RPC. Results indicate that the supplementation of RPM and RPC have been improved reproductive performance and health situation of dairy cows.
  A. Zali , A. Nik-Khah , A. Zare Shahneh , K. Rezayazdi and M. Ganjkhanlou
  This experiment was conducted to investigate the effect of feeding supplemental zinc (zinc sulfate) in different levels (0, 15 and 30 mg/kg) on ewes weight, milk production, Zn concentrations in serum and serum alkaline phosphates activity. Thirty lactating Varaminni ewes were assigned to three experimental groups according to their live body weights, milk production and lambs sex in a completely randomized design. Ewes were fed a basal diet containing alfalfa, wheat straw, cottonseed meal, barley grain, wheat bran, cracked corn and vitamin-mineral supplements at 3.2% of BW to meet NRC requirements for protein, energy, macro minerals and micro minerals. The basal diet contained 15 mg/kg Zn and Zinc sulfate was added to the basal diet to supply 30 or 45 mg/kg of dietary zinc. Milk yielded, milk composition and ewes` weight was recorded at 7 and 21 days intervals respectively. Samples of the blood were taken three times (0, 35 and 64) for determination of Concentration of Zn, Cu and Fe, Na, K, Ca in serum. Also serum alkaline phosphates concentration of ewes was measured. Milk yield, milk composition and ewes` weight of ewes were not affected by supplemental zinc (p>0.05). Alkaline phosphatase concentration was increased with supplemental zinc linearly and this increase was significant (p<0.05). Blood mineral concentration was not affected by treatment (p>0.05).
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