• Parasites, Hosts and Diseases
• /
• 제55권5호
• /
• pp.481-489
• /
• 2017

Tick-borne pathogens can cause serious problems in grazing cattle. However, little information is available on tick-mediated diseases in cattle grazing on mountains. Thus, this study aimed to understand the potential problems related to tick-borne diseases in grazing cattle through the investigation of prevalent tick-transmitted infections, and their associated hematological changes, in terms of season and grazing type in Korean indigenous cattle (=Hanwoo). Hanwoo cattle from 3 regions of the Republic of Korea (=Korea) were either maintained indoors or placed on grassy mountains from spring to fall of 2014 and 2015. Cattle that grazed in mountainous areas showed a greater prevalence of tick-borne infections with an increased Theileria orientalis infection rate (54.7%) compared to that in non-grazing cattle (16.3%) (P<0.001). Accordingly, the red blood cell (RBC) count and hematocrit (HCT) values of grazing cattle were significantly lower than those of non-grazing cattle throughout the season (P<0.05). Moreover, RBC, hemoglobin (Hb), and HCT of T. orientalis-positive group were significantly lower than those of T. orientalis-negative group (P<0.05). T. orientalis is a widespread tick-borne pathogen in Korea. Grazing of cattle in mountainous areas is closely associated with an increase in T. orientalis infection (RR=3.4, P<0.001), and with consequent decreases in RBC count and HCT. Thus, these findings suggest that the Hanwoo cattle in mountainous areas of Korea are at a high risk of infection by T. orientalis, which can lead to hematological alterations. This study highlights the necessity of preventive strategies that target T. orientalis infection.

• 대한수의학회지
• /
• 제51권2호
• /
• pp.93-99
• /
• 2011

This study surveyed the prevalence of traumatic reticular diseases (TRD) of slaughter cattle in Korea, the typology of the causative foreign bodies and the effects on beef quality and carcass weight. The overall prevalence of TRD in 3,121 slaughter cattle was 5.5%. However, the prevalence was significantly higher in Korea indigenous cattle Hanwoo (5.8%, p < 0.05) and female cattle (20.75%, p < 0.001). The prevalence significantly increased in aged cattle (p < 0.001). Major lesions related to foreign bodies were reticulitis (96%) and peritonitis (86%). Most causative foreign bodies were made of iron including nails, wires, steel rods, screw nails, and syringe needles. Cattle affected with TRD produced significantly lower grade quality of beef compared to normal cattle (p < 0.0001), but TRD did not affect carcass weight. The data will be useful in the management of TRD, with the aim of increasing beef productivity in Korea.

• 한국동물위생학회지
• /
• 제34권2호
• /
• pp.179-185
• /
• 2011

Neospora caninum is now recognized as one of the important causes of abortion in cattle worldwide, but there was no report on seroprevalence of antibodies to N. caninum in cattle at Seoul slaughtering center. Serum samples from 610 Korean indigenous cattle (Hanwoo) and 246 Holstein cattle from 452 farms located all over the country, Korea, were tested for N. caninum antibodies using a commercial enzyme-linked immunosorbent assay (ELISA) kit. Seven of 610 (1.1%) Hanwoo and 54 of 246 (22.0%) Holstein cattle were seropositive.

• 한국임상수의학회지
• /
• 제26권6호
• /
• pp.582-585
• /
• 2009

소 바이러스성 설사병 바이러스는 전세계 축산업에서 경제적 파급력이 큰 질병이다. 콧물을 이용한 역전사 중합효소연쇄반응을 이용하여 한우송아지에서 소 바이러스성 설사병 바이러스의 발생이 진단 되었다. 가검물을 채취한 21 마리 소 가운데 12마리가 소 바이러스성 설사병 바이러스에 양성반응을 보여 지속감염우로 분류되었다. 이 동물들은 설사와 폐렴 같은 증상을 나타내었다. 지속감염우는 일발적으로 지속감염 송아지에서 발견된다. 5'-UTR을 이용한 염기서열 및 계통발생 분석에서 본 증례는 BDVD-2a에 속했다. 이들 결과는 콧물을 이용하여 지속감염우를 진단할 수 있다는 것과, 한우 송아지에서 BVDV 근절 대책이 필요하다는 것을 말해 주고 있다.

• 한국임상수의학회지
• /
• 제27권3호
• /
• pp.220-224
• /
• 2010

소 바이러스성 설사 바이러스는 전세계 축산업에서 중요한 질병이다. 대한민국의 최대 소 사육지역인 경북지방에서 유행하고 있는 소 바이러스 설사 바이러스를 조사하기 위해, 소 바이러스성 설사 바이러스의 임상증상을 보이는 한우 송아지로부터 365개의 분변을 채취하였다. 가검물을 채취한 365 마리 송아지 가운데 50 마리가 소 바이러스성 설사 바이러스에 양성반응을 보였다. 5'-UTR을 이용한 계통발생 분석에서 48두 송아지가 BDVD-2a에 속했고, 2두에서만 각각 BVDV-1a와 BVDV-1b로 분류되었다. 이들 결과는 BVDV-2a가 경북지역의 한우 송아지에서 유행하고 있음을 제시하고 있다.

• Parasites, Hosts and Diseases
• /
• 제62권1호
• /
• pp.151-156
• /
• 2024

Bovine borreliosis, caused by Borrelia theileri which is transmitted via hard tick bites, is associated with mild clinical symptoms, such as fever, lethargy, hemoglobinuria, anorexia, and anemia. Borrelia theileri infects various animals, such as cattle, deer, horses, goats, sheep, and wild ruminants, in Africa, Australia, and South America. Notably, no case of B. theileri infection has been reported in Korean cattle to date. In this study, 101 blood samples were collected from a Korean indigenous cattle breed, among which 1.98% tested positive for B. theileri via nested PCR. The obtained sequences exhibited high homology with B. theileri strains identified in other regions. Phylogenetic analysis of 16S rRNA confirmed the B. theileri group affiliation; however, flagellin B sequences exhibited divergence, potentially due to regional evolutionary differences. This study provides the first molecular confirmation of B. theileri infection in Korean livestock. Further isolation and nucleotide sequence analyses are necessary to better understand the presence of B. theileri strains in cows in Korea.

• Journal of Veterinary Science
• /
• 제24권5호
• /
• pp.62.1-62.7
• /
• 2023

This case report describes the hematological and radiological examination of urinary bladder rupture and complete urethral obstruction. associated with urolithiasis in Hanwoo. Hyponatremia, hypochloremia, azotemia, and hyperglycemia were observed in both urethral obstruction and urinary bladder rupture. However, cattle with urethral obstruction showed hyperkalemia and mild hyperglycemia, whereas cattle with bladder rupture showed marked hyperglycemia and normal potassium levels. In ultrasonography, the urethral obstruction showed a dilated bladder with a thick bladder wall. In contrast to previous literature, in this study, severe electrolyte changes such as severe hyponatremia, hypochloremia, and hyperkalemia occurred in a case of complete urethral obstruction.

• Asian-Australasian Journal of Animal Sciences
• /
• 제25권9호
• /
• pp.1223-1228
• /
• 2012

The population sizes of three Korean indigenous cattle populations have been drastically reduced over the past decades. In this study, we examined the extent to which reduction in populations influenced genetic diversity, population structure and demographic history using complete mitochondrial DNA (mtDNA) control region sequences. The complete mtDNA control region was sequenced in 56 individuals from Korean Black (KB), Jeju Black (JEB) and Korean Brindle (BRI) cattle populations. We included 27 mtDNA sequences of Korean Brown (BRO) from the GenBank database. Haplotype diversity estimate for the total population was high (0.870) while nucleotide diversity was low (0.004). The KB showed considerably low nucleotide (${\pi}$ = 0.001) and haplotype (h = 0.368) diversities. Analysis of molecular variance revealed a low level of genetic differentiation but this was highly significant (p<0.001) among the cattle populations. Of the total genetic diversity, 7.6% was attributable to among cattle populations diversity and the rest (92.4%) to differences within populations. The mismatch distribution analysis and neutrality tests revealed that KB population was in genetic equilibrium or decline. Indeed, unless an appropriate breeding management practice is developed, inbreeding and genetic drift will further impoverish genetic diversity of these cattle populations. Rational breed development and conservation strategy is needed to safeguard these cattle population.

• 한국수정란이식학회지
• /
• 제30권3호
• /
• pp.175-181
• /
• 2015

본 연구에 사용된 공시축은 2013년 1월부터 2014년 12월까지 국립축산과학원 가축유전자원센터에서 사육 중인 모색을 기준으로 동일연령인 일반한우(황우), 백한우 및 복제소 18두(황우 10두, 백우 7두 그리고 복제소 1두)를 대상으로 혈액학적 수치를 확인하였다. 동일연령의 복제소와 백한우의 성장 단계별 혈액학적 검사 결과에서 1년 이하에서 1~2년으로 연령이 증가됨에 따라 RBC 관련 6개의 인자의 측정수치가 정상치 범위내 임을 확인했다. 또한 일반한우와의 비교에서도 차이점이 인정되지 않았다. 하지만, 복제소를 포함하는 백한우군와 일반 한우군 간의 RBC($11.2{\sim}10.1{\times}10^6/{\mu}l$, $12.0{\sim}10.3{\times}10^6/{\mu}l$로)와 PL치($592{\sim}448{\times}10^3/{\mu}l$, $589{\sim}450{\times}10^3/{\mu}l$로)에서 각각 유의성 있는 감소(P<0.05)가 인정되었다. 또한, 복제소와 백한우의 백혈구계 검사 결과에서도 1년 이하에서1~2 년으로 연령이 증가함에 따라 WBC 수치($12.0{\sim}11.1{\times}10^3/{\mu}l$, $12.5{\sim}10.0{\times}10^3/{\mu}l$)가 감소했지만, 정상치 범위 내의 결과를 확인했다. 백혈구 분포의 백분율에서는 전반적으로 복제소 및 백한우의 림프구가 41.0~39.0%, 43.1~41.6%이며, 분엽형 호중구 수치는 32.0~29.0%, 33.9~30.9%로 나타났다. 일반 한우군과 복제소를 포함하는 백한우군 간의 백혈구계의 림프구 수치의 비교에서는 백한우군(41.6%)로, 일반한우(45.1%)에 비하여 유의적으로 낮음(P<0.05)을 확인하였다. 본 연구결과를 통하여 백한우의 귀체세포 유래의 복제소의 혈액학적 분석 결과로 건강상에 문제점이 없음을 확인하였다.

• 한국축산식품학회지
• /
• 제33권6호
• /
• pp.715-722
• /
• 2013

Heugu (Korea Black Cattle) is one of the indigenous cattle breeds in Korea; however there has been severe lack of genomic studies on the breed. In this study, we report the first whole genome resequencing of Heugu at higher sequence coverage using Illumina HiSeq 2000 platform. More than 153.6 Giga base pairs sequence was obtained, of which 97% of the reads were mapped to the bovine reference sequence assembly (UMD 3.1). The number of non-redundantly mapped sequence reads corresponds to approximately 28.9-fold coverage across the genome. From these data, we identified a total of over six million single nucleotide polymorphisms (SNPs), of which 29.4% were found to be novel using the single nucleotide polymorphism database build 137. Extensive annotation was performed on all the detected SNPs, showing that most of SNPs were located in intergenic regions (70.7%), which is well corresponded with previous studies. Of the total SNPs, we identified substantial numbers of non-synonymous SNPs (13,979) in 5,999 genes, which could potentially affect meat quality traits in cattle. These results provide genome-wide SNPs that can serve as useful genetic tools and as candidates in searches for phenotype-altering DNA difference implicated with meat quality traits in cattle. The importance of this study can be further pronounced with the first whole genome sequencing of the valuable local genetic resource to be used in further genomic comparison studies with diverse cattle breeds.