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Articles by A. Ahmadzadeh
Total Records ( 2 ) for A. Ahmadzadeh
  H. Aghdam Shahriar , A. Rezaei , A. Lak and A. Ahmadzadeh
  An experiment was conducted to study the effect of different levels of dietary fat source (canola oil and poultry fat) on blood and tissue biochemical factors of broiler chickens. A total of 180 day-old broilers chicks (Ross 308) were randomly assigned in to 5 dietary treatments (3 replicates of 12 birds per treatment) fed experimental diets. The experiment was performed in a Completely Randomize Design (CRD) and birds were fed with experimental diet for the period of 3 weeks (21-42 d-old). The experimental treatment included) basal diet without fat supplementation ) basal diet with 3% canola oil ) basal diet with 6% canola oil ) basal diet with 3% poultry fat ) basal diet with 6% poultry fat. The criteria measured were the levels of cholesterol, triglyceride, HDL and LDL in blood, also levels of cholesterol and triglyceride in tissue (breast and thigh). Blood biochemical factors were not significantly influenced by dietary fat. Adding 3% poultry fat to the diet, significantly decrease levels of cholesterol and triglyceride in thigh tissue (p< 0.01) and at the level of 6% decrease level of cholesterol in breast tissue (p< 0.01). The highest triglyceride was found in breast tissue of control group compared with other groups (p< 0.05). These results suggest that poultry fat supplementation induced a significant decrease in triglyceride and cholesterol concentrations in tissue (breast and thigh) in comparison with that receiving canola oil.
  A. Ahmadzadeh , R. Manzo , C.B. Sellars and J.C. Dalton
  The objectives were to determine the effect of a reduced dose of GnRH (50 µg) on the incidence and time of ovulation following an ovulation synchronization protocol (Ovsynch) in lactating Holstein cows. Fifty-five days postpartum (14 day) cows received (i.m.) 25 mg PGF2 . Fourteen days later (0 day) cows were assigned to1 of 2 treatment groups. Cows in Group 1 received half of the recommended dose of GnRH (HD; n = 17) and received 50 µg of GnRH on d 0, PGF2 (25 mg) on day 7 and GnRH (50 µg) on day 9. Cows in Group 2 were assigned to a full dose of GnRH (100 µg; FD; n = 17) and were synchronized using the same protocol. Ovarian activities were monitored by ultrasonography on day 0, 7 and 9 and also at 12 h, 20 h and then every 3 h until 39 h after the second GnRH injection. Blood samples were collected on day 7 and analyzed for serum Progesterone (P4). Mean BW was not different between groups. On day 7, mean serum P4 was above 1 ng mL 1 and did not differ between the groups. On day 9, concentrations of P4 decreased to below 1 ng mL 1 and did not differ between groups. Mean diameter of the ovulatory follicles in HD and FD were similar. Incidence of ovulation and mean ovulation time relative to the second GnRH did not differ between the groups. None of the cows exhibited estrus during the study period. Cows that ovulated developed a Corpus Luteum (CL) which was visualized using ultrasonography 7 d after ovulation. These results indicated that a reduced dose of GnRH did not affect ovulation time relative to the second GnRH injection and did not compromise the incidence of ovulation and luteal development when used in an Ovsynch breeding protocol.
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