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Low versus high antral follicle count on the fertility of timed AI Nelore heifers
2022
Jair Sábio de Oliveira Junior | George Moreira da Silva | Elizângela Mirian Moreira | Vanessa Rachele Ribeiro Nunes | Fábio Morotti | Evelyn Rabelo Andrade | Marcelo Marcondes Seneda | Luiz Francisco Machado Pfeifer
This study aimed to determine the effect of antral follicle count (AFC), and pubertal status on the fertility of beef heifers. In this study, 230 Nelore heifers, 20±2 months of age, were subjected to an estradiol progesterone-based timed artificial insemination (TAI) program. On Day 0 of the TAI protocol, the heifers were examined by transrectal ultrasound to record videos of the ovaries. Later, in the darkroom of the laboratory of images, the videos were analyzed for AFC (≥ 3 mm) of each ovary. Females who failed the first TAI were resynchronized with the same hormonal protocol. The pregnancy status was evaluated by ultrasonography 30 days after each FTAI. The general mean of the AFC was 22.0 follicles. Thus, the heifers were divided into 2 groups according to AFC: Low AFC (˂ 22 follicles, n = 114), and High AFC (≥ 22 follicles, n = 116). No differences (P > 0.05) in the pregnancy per AI (P/AI) were observed between the Low and High AFC groups, and between pubertal and prepubertal categories. The P/AI was not different between heifers that displayed or did not estrus (P = 0.2). However, considering the estrus response of each AFC group, High AFC heifers that displayed estrus had greater P/AI (P = 0.01) than High AFC heifers that did not display estrus. In summary, AFC and pubertalstatus did not affect the fertility of Nelore heifers. In contrast, the P/AI of heifers that did not display estrus was lower than heifers observed in estrus only in the High AFC group.
Показать больше [+] Меньше [-]Survey of bovine brucellosis on the island of Fernando de Noronha, Pernambuco, Brazil
2022
Erivânia Camelo de Almeida | Marcília Maria Alves de Souza | Carlos Diógenes Ferreira Lima Filho | Fernando Jorge Rodrigues Magalhães | Késia Alcântara Queiroz Pontual | Filipe Sobral Fonsêca | Maria Fernanda Vianna Marvulo | Ricardo Augusto Dias | Fernando Ferreira | José Soares Ferreira Neto | Jean Carlos Ramos da Silva
Considering the lack of information about livestock diseases on Brazilian oceanic islands, the occurrence of bovine brucellosis was investigated on the island of Fernando de Noronha, state of Pernambuco, Brazil. Serum samples were collected in October 2009, from all the 105 cows raised on the island at that time. These were examined concurrently using the Rose Bengal test and the Complement Fixation Test. All the samples were negative in both tests, indicating that the cows on the island were likely free from infection by smooth forms of Brucella. These results can partly be explained by the prohibition of introduction and importation of both small and large-sized animals that had been implemented through District Decree 19 of February 28, 2004.
Показать больше [+] Меньше [-]Preliminary study on gene regulation and its pathways in Chinese Holstein cows with clinical mastitis caused by Staphylococcus aureus
2022
Wang Wenjia | Li Rongling | Ye Tingzhu | Zhang Xinxin | Chen Chao | Liang Ai-xin | Yang Li-guo
Clinical mastitis (CM) is one of the most common diseases of dairy cows globally, has a complex aetiology and recurs easily. Staphylococcus aureus is a frequently isolated pathogen responsible for bovine mastitis and remains difficult to eradicate.
Показать больше [+] Меньше [-]Screening for Coxiella burnetii in dairy cattle herds in Poland
2022
Szymańska-Czerwińska Monika | Jodełko Agnieszka | Osiński Zbigniew | Niemczuk Krzysztof
The intracellular bacterium Coxiella burnetii is the aetiological agent of Q fever, a zoonosis affecting many animal species worldwide. Cattle and small ruminants are considered the major reservoirs of the bacteria and they shed it through multiple routes.
Показать больше [+] Меньше [-]Antimicrobial resistance and virulence genes of Streptococcus agalactiae isolated from mastitis milk samples in China
2022
Zhao Yankun | Shao Wei | Wang Fulan | Ma Jiaoxiao | Chen He | Wang Shuai | Wu Yating | Wang Cheng | Zheng Nan | Wang Jiaqi | Liu Huimin
Streptococcus agalactiae is an important zoonotic pathogen that affects milk production and quality and poses a threat to public health. Treatment of infections with this bacterium exploits antimicrobials, to which the resistance of S. agalactiae is a growing problem. Addressing the possibility of a correlation between this pathogen’s genetic factors for antimicrobial resistance and virulence, this study attempted to identify the relevant genes.
Показать больше [+] Меньше [-]Ultrasonography as a Differential Diagnostic Tool of Bovine Respiratory Tract Disorders with Reference to Serum Haptoglobin and Lipid Profiles Changes
2022
Arafat Khalphallah | Hanan K. Elsayed | Abdelraheim A. Mottelib | Mohammed G. Mohammed
Respiratory diseases of cattle represented the most important health and economic problems of cattle rearing. It was possible to diagnose ultrasonographically bronchopneumonia, consolidation, pulmonary emphysema, pleural effusion and pleuritis. The study aimed to correlate between the changes in clinical findings and laboratory assays mainly haematological pictures and serum acute phase proteins (APPs) i.e. haptoglobin, and the characteristic ultrasonographic findings in bovine respiratory diseases and their importance in differentiation between upper respiratory diseases and lower respiratory diseases in cattle. A total number of 84 cattle were included in the study and divided into 3 groups: healthy control group (n=15), upper respiratory diseased group [URG] (n=29) and lower respiratory diseased group [LRG] (n=40). The animals were admitted to the Veterinary Teaching Hospital at Assiut University-Egypt with a history of anorexia, respiratory distress, nasal discharge, cough and/or abnormal lung sounds. These animals were undergoing clinical and ultrasonographic examinations as well as laboratory analyses. Regarding to the ultrasonographic findings, the diseased cases were classified into URG and LRG. Ultrasonography differentiated many of the affections such as bronchopneumonia (n=16), Lung consolidation (n=12), pulmonary emphysema (n=8), and pleuritis and pleural effusion (n=4). Neutrophilic leukocytosis was reported in URG and LRG. The biochemical assays revealed significant elevation in serum levels of haptoglobin, fibrinogen, total cholesterol, triglyceride, high density lipoprotein cholesterol and very low-density lipoprotein in URG and LRG. Serum albumins were remarkably (P<0.05) decreased in URG. The study concluded that thoracic ultrasonography considered a diagnostic tool in cows with respiratory diseases because it determined the location and extent of the lung lesions as well as the severity of the affection. APPs and lipid profile used as biomarkers for the diagnosis of bovine respiratory diseases.
Показать больше [+] Меньше [-]A Case of Giant Myxoid Liposarcoma in a Cow
2022
Ünal Yavuz | Nihat Yumuşak | Kerem Yener | Ali Hayat
In this case, it was aimed to evaluate the immunohistochemical and histopathological examinations along with surgical intervention results of a myxoid liposarcoma in a ten-year-old, female hybrid cattle. During clinical examination, an elastic mass, approximately 35x30x30 cm in size, was detected in the right fossa paralumbal region. As a treatment, total extirpation of the mass under sedation and local infiltration anesthesia was performed. The sections were prepared from the extirpated mass tissues and stained with hematoxylin-eosin for histopathological examination. In addition they were labeled with S-100 antibody for immunohistochemical examination. Histopathologically, atypical stellate spindle-shaped tumour cells were seen in the stroma of hypocellular region and inlarge lipoid cells locally and also, around the numerous vessels with thin Wall character. In addition, it was determined that these cells reacted positively with S-100 antibody immunohistochemically. After the removal of the mass surgically, no recurrence was observed during 2 year follow up and it was learned that the general condition of the cattle was good. As a result, due to the rarity of the disease, it was concluded that reporting myxoid liposarcoma cases may contribute to future studies.
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