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Articles by Afshin Davasaztabrizi
Total Records ( 4 ) for Afshin Davasaztabrizi
  Afshin Davasaztabrizi
  To evaluate of the factors for culling of the Holstein dairy cows in an industrial herd in Tabriz, data of the reasons for deleting is divided in seven groups such as financial factors, infertility and reproduction problems, low milking cows, mastitis and udder problems, lameness, digestive system diseases, etc. At all, 2458 Holstein cows in 9 herds have evaluated. Selling the cow for the milk, infertility and low milking cows were the important reasons for culling that were 127 and 78 from 326 cows in order. The fourth reason for deleting was mastitis and udder problems that include 21 cows. The fifth factor was the digestive system diseases with 16 cows. The voluntary reason for culling was the selling cows plus low milking cows that was 56% of the culled cows. The most involuntary culling reason was for infertility and reproduction problems that were 24% of total and 41% of involuntary culling.
  Afshin Davasaztabrizi
  Retained placenta is defined as the failure to pass all or part of the placenta from the uterus within 24 h of calving. There are several potential causes for placental retention but the effects on the general health of the cow and her subsequent reproductive performance are costly events to the dairyman. In this study which carried out in Tabriz suburb, we used of 30 Holstein cows allocated in the 3 groups and treated as group 1; handling, group 2; oxytetracycline and group 3; concomitant use of method 1 and 2. Based on data revealed that there is a significant difference among group 2 with two other groups. Thus can be state that Method No. 2 is a good way to treatment of retained placenta. The negative effect of retained placentas on subsequent fertility is commonly due to delayed involution of the uterus and chronic endometritis, one of the more common causes of infertility. Some cows with retention are affected with permanent sterility due to pyometra, perimetritis, salpingitis (inflammation of oviducts), ovaritis or severe damage to the endometrium. In most animals, the major economic loss is due to slight to moderate loss of milk and impaired involution of the uterus, thus a delay in conception. Thus, retained placenta must be treated as soon as possible and based on the data oxytetracycline is appropriate method for treatment of this disorder.
  Afshin Davasaztabrizi
  Historically, estrus synchronization has been promoted as a labor saving tool for those producers who want to capitalize on the superior genetics available through use of AI. However, the labor saving aspect is peanuts compared to the economic returns available when estrus synchronization is used as a reproductive management tool. The aim of this study was to comparison of the two different methods: select synch and estrous synchronization by PGF. In this study, about 68 newly parturited cows were examined about 25 days after their parturition for clean test. About 45 days after parturition cows were divided into 2 groups and prepared for artificial insemination. Animals of group 1 (36 cows) were inseminated by select Synch Method. Animals of group 2 were treated as estrus synchronization. Based on data obtained from Chi-square test, it has been revealed that there is no significant difference between two groups (p>0.05).
  Afshin Davasaztabrizi
  Retained Placenta (RP) may result from a number of factors, such as abortion, forced labor, delayed gestation, early parturition, uterine atony, infections and seasonal and hormonal disorders. In addition, it is well known that deficiencies of some vitamins and minerals induce or predispose animals to RP. The objective of the present study was to investigate the between serum concentrations vitamin A, β-carotene, calcium and phosphorus and the development of RP in cows. The 25 cows were retained placenta; to wit they have not excreted their placenta after parturition. The 20 others have excreted their placenta normally after parturition. Blood samples were obtained from all understudying animals from tail vein by venoject. Samples were centrifuged and sera were prepared and amounts of vitamin A, β-carotene, calcium and phosphorus were measured. Data showed that there is no significant difference among vitamin A and β-carotene between two groups (p>0.05). While revealed that there is a significant difference in mean value of Ca and P among two groups.
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