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Effects of teat dipping disinfectant containing biodegradable iodophor microspheres on preventing dry period intramammary infection in dairy cows
Hwang, C.Y.;Kim, J.M.;Youn, H.Y.;Han, H.R.(Seoul National University, Seoul, Republic of Korea)E-mail:hrhan@snu.ac.kr | (Han, B.)E-mail:China Agricultural University, Beiijing, China
1% iodophor loaded microspheres of PLGA (Poly[DL-Lactide-co-Glycolide]) were prepared by solvent evaporation method and were applied to the cows on dry period for evaluating it's preventive effects on intramammary infections. The morphology of the microspheres were evaluated using scanning electron microscopy and their releasing patterns were investigated. On investigating idophor releasing patterns of the microsphere, burst releasing pattern was detected until 2 days after in vitro incubation and sustained releasing was observed until 4 weeks.
Показать больше [+] Меньше [-]A case of malignant dysgerminoma in a slaughtered dairy cow
2015
Jung, J.Y., Division of Animal Disease Diagnosis, Animal and Plant Quarantine Agency, Anyang, Republic of Korea | Her, J.W., Division of Animal Disease Diagnosis, Animal and Plant Quarantine Agency, Anyang, Republic of Korea | Jeong, Y.J., Division of Animal Disease Diagnosis, Animal and Plant Quarantine Agency, Anyang, Republic of Korea | Ku, K.N., Gyeonggi-do Veterinary Service, Suwon, Republic of Korea | Choi, K.R., Gyeonggi-do Veterinary Service, Suwon, Republic of Korea | So, B.J., Division of Animal Disease Diagnosis, Animal and Plant Quarantine Agency, Anyang, Republic of Korea | Yoon, S.S., Division of Animal Disease Diagnosis, Animal and Plant Quarantine Agency, Anyang, Republic of Korea
An abnormally enlarged right ovary and a mass in fat surrounding the right kidney were discovered in a dairy cow during routine postmortem examination at slaughter. The ovary was dark reddish and multinodular in shape. Numerous cystic structures were identified in the mass. Histopathologically, the ovary was completely replaced with large, uniform, polyhedral neoplastic cells containing vesicular nuclei and prominent nucleoli. The mitotic index was high. In the lymphatic vessels, tumor emboli were observed. Another mass in the fat surranding the right kidney had the same histological features as the ovarian mass. This animal was diagnosed with malignant dysgerminoma and metastasis to other peritoneal organs.
Показать больше [+] Меньше [-]Incidence of hypocalcemia and its changes of biochemical parameters in periparturient cows
2012
Shu, Shi, Heilongjiang Bayi Agricultural University, Daqing, China | Xia, Cheng, Heilongjiang Bayi Agricultural University, Daqing, China | Xu, Chuang, Heilongjiang Bayi Agricultural University, Daqing, China | Zhang, Hongyyou, Heilongjiang Bayi Agricultural University, Daqing, China | Wu, Ling, Heilongjiang Bayi Agricultural University, Daqing, China
In this study, we investigate the status of calcium (Ca) homeostasis at parturition in three dairy farms (Ⅰ, Ⅱ, and Ⅲ), Heilongjiang, China. Twenty multiparous Holstein cows from each farm were randomly assigned to this experiment. The dietary cation-anion difference (DCAD) was 91 mEq/kg of DM for farm Ⅰ, 152 mEq/kg of DM for farm Ⅱ, and 85 mEq/kg of DM for farm Ⅲ. Incidence of hypocalcemia was above 75% and urine pH was above 7.25 at calving in each farm. Compared to other farms, cows in farm Ⅱ that fed the greatest positive DCAD had the lowest concentration of serum Ca, the highest concentration of serum PTH, and the greatest urine pH at calving (p less than 0.05). However, there was not significant difference in serum 1,25-dihydroxy-vitamin D and hydroxyproline concentration of the cows among three farms. This is the first study to confirm that hypocalcemia is very prevalent at calving in Chinese dairy farms, and the high positive DCAD is a major risk factor that results in hypocalcemia at calving, which may reduce ability of the cow to maintain Ca homeostasis.
Показать больше [+] Меньше [-]The impact of the duration of retained placenta on postpartum diseases and culling rates in dairy cows
2011
Hur, T.Y., National Institute of Animal Science, RDA, Cheonan, Republic of Korea | Jung, Y.H., National Institute of Animal Science, RDA, Cheonan, Republic of Korea | Kang, S.J., National Institute of Animal Science, RDA, Cheonan, Republic of Korea | Choe, C.Y., National Institute of Animal Science, RDA, Cheonan, Republic of Korea | Kim, U.H., National Institute of Animal Science, RDA, Cheonan, Republic of Korea | Ryu, I.S., National Institute of Animal Science, RDA, Cheonan, Republic of Korea | Son, D.S., National Institute of Animal Science, RDA, Cheonan, Republic of Korea | Park, S.J., National Institute of Animal Science, RDA, Cheonan, Republic of Korea | Kim, I.H., Chungbuk National University, Cheongju, Republic of Korea
The objective of this study was to evaluate the duration of retained placenta (RP) on postpartum diseases and culling in dairy cows. Data were collected from 456 Holstein cows between 2008 and 2010. RP (greater-than or equal to 24 h after parturition) and postpartum diseases were diagnosed by farm managers and a veterinarian according to standardized definitions. The overall incidence rate of RP was 14.0%, and the incidence rate of RP with fourth and higher parity was two times that of cows having offspring for the first time. The duration of RP was 2 to 15 days with a mean of 6.8 days, except for cases of fourth and higher parity which had a mean of 10.5 days. A total of 63% of cows with RP had postpartum diseases. Among the cows diagnosed with RP, 23.4% developed metritis, and of those, 35.3% developed endometritis or pyometra. A total of 25% (n = 16) cows with RP were culled within 60 days in milk (DIM) and of those culled, 75% (n = 12) had postpartum diseases. These results suggest that RP increases the risk of postpartum diseases such as metritis and mastitis and is a culling hazard up to 60 DIM.
Показать больше [+] Меньше [-]Improvement of reproductive performance by the application of reproductive herd health program in high yielding dairy herds
Rho, K.S.;Kim, U.H.;Nam, H.W.;Kang, H.G.;Kim, I.H.(Chungbuk National University, Cheongju, Republic of Korea)E-mail:illhwa@cbu.ac.kr | Suh, G.H.(National Livestock Research Institute, RDA, Cheonan, Republic of Korea)
We investigated the effect of reproductive herd health program (RHHP) on the reproductive performance in high yielding dairy herds. Data collected from 205 lactations at Boeun County, Chungbuk from April 2001 to Dec. 2003 included postpartum reproductive and metabolic diseases, body condition score (BCS), reproductive performance and milking records. First we compared the reproductive performance of cows without RHHP (pre-RHHP group) and cows with RHHP (RHHP group).
Показать больше [+] Меньше [-]Classification of acute clinical mastitis on the base of vital signs and complete blood count test in dairy cows
2013
Hur, T.Y., Rural Development Administration (RDA), Cheonan, Republic of Korea | Kang, S.J., Rural Development Administration (RDA), Cheonan, Republic of Korea | Jung, Y.H., Rural Development Administration (RDA), Cheonan, Republic of Korea | Lee, H.J., Rural Development Administration (RDA), Cheonan, Republic of Korea | Ki, K.S., Rural Development Administration (RDA), Cheonan, Republic of Korea | Choe, C.Y., Rural Development Administration (RDA), Cheonan, Republic of Korea | Suh, G.H., Chonnam National University, Gwangju, Republic of Korea
This study was carried out to evaluate the diagnosis of acute clinical mastitis (ACM) which was based on the vital signs and complete blood count (CBC) tests in dairy cows. Twenty eight dairy cows diagnosed with ACM, were selected for the study between Jan 2003 and July 2006 in the National Institute of Animal Science. Based on their vital signs (rectal temperature, depression, rumen contraction and, dehydration status), ACM was divided into three different classes; mild, moderate and severe forms. In addition, ACM cows were subjected to CBC tests for further diagnosis of ACM. Of the 27 dairy cows diagnosed with ACM, 3 cows were determined to have a mild form, while moderate and sever forms were each observed in twelve cows. Among of them, 4 cows died, 5 cows were culled and 18 cows were recovered. In the mild form, all haematological parameters were comparable with normal values. However, leukopenia, due to neutropenia and lymphocytopenia, appeared characteristically in the moderate and severe forms. Using the observation of vital signs in conjunction with CBC tests, the diagnosis of ACM is more accurate, and is helpful in making decisions of whether treatment or culling of dairy cows infected with ACM is most appropriate.
Показать больше [+] Меньше [-]Clinico-pathological findings in peripartum dairy cows fed anion salts lowering the dietary cation-anion difference: Involvement of serum inorganic phosphorus, chloride and plasma estrogen concentrations in milk fever
2007
Kurosaki, N.(Hokkaido Univ., Sapporo (Japan)) | Yamato, O. | Sasamoto, Y. | Mori, F. | Imoto, S. | Kojima, T. | Yamasaki, M. | Maede, Y.
In our previous study, it was demonstrated that the administration of anion salts, which slightly lower the dietary cation-anion difference (DCAD), in the prepartum period is safe and effective for preventing milk fever in multiparous cows. In the present study, several clinico-pathological constituents in serum and urine, which might be related to milk fever, were analyzed using stored samples from the previous study to identify clinico-pathological parameters for easily evaluating the efficacy of lowering DCAD and to further investigate the mechanism by which lowering DCAD prevents milk fever. Among the parameters analyzed in the present study, inorganic phosphorus (iP) was involved in milk fever because the serum concentration and urinary excretion of iP were significantly higher in the group of primiparous cows (heifer group), which did not develop hypocalcemia, than those in other groups of multiparous cows. Serum chloride concentrations in the heifer group and the group of multiparous cows fed anion salts (anion group) tended to remain higher than those in other control groups of multiparous cows suggesting that serum chloride concentration may be utilized for evaluating the status of metabolic acidosis and the efficacy of lowerng DCAD in dairy cows fed anion salts. In addition, plasma estradiol-17beta concentration in the heifer group tended to be lower at parturition compared with that in other multiparous groups suggesting that estrogen known as a potent inhibitor of bone resorption may be involved in developing milk fever.
Показать больше [+] Меньше [-]Progesterone assays as an aid for improving reproductive efficiency in dairy cattle-(3)-Milk progesterone profiles in repeat-breeder dairy cows
1994
Kang, B.K. | Choi, H.S. | Son, C.H. | Chon, H.S. (Chonnam National University, Kwangju (Korea Republic). College of Veterinary Medicine) | Choi, S.G. (Suhkwang Livestock Company Ltd., Kwangju (Korea Republic))
Osmotic fragility of erythrocyte in cattle, sheep and goats
1990
Min, B.M. | Lee, B.W. (Chonnam National University, Kwangju (Korea Republic). College of Agriculture)
Relationship between the N-acetyl-Beta-D-glucosarminidase levels and the presence of mastitis pathogens in bovine mastitis milk samples
1993
Kang, B.K. | Nam, H.M. | Shon, C.H. (Chonnam National University, Kwangju (Korea Republic). College of Veterinary Medicine)