• Korean Journal of Veterinary Research
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• v.14 no.2
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• pp.221-225
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• 1974

1. The length of Trypanossoma was $20{\sim}40{\mu}m$ (including flagellum) in dairy cattle in Korea, 2. Crithidia of Trypanosoma was found out in the head of depressed Tabanid fly and 77% in the flies. 3. The Trypanosoma in the tryptose blood agar was changed its form from 6 weeks after cultivation. 4. Infectious rate of Trypanosoma in dairy cattle was the same as in Korean cattle. 5. Infectious rate of Trypanosoma in dairy cattle was higher in summer than in winter. 6. No Trypanosoma was found in the blood from the jugular vein of calves born in winter. 7. Erythrocyte increased while leukocyte decreased in nummber in the blood of the cattle infected with Trypanosoma.

• Asian-Australasian Journal of Animal Sciences
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• v.31 no.9
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• pp.1415-1419
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• 2018

Objective: To estimate effect of single nucleotide polymorphisms on the intramuscular fat content (IMF) of Hungarian Simmental bulls. Methods: Genotypes were determined on high-density Illumina Bovine DNA Chip. After slaughtering of animals, chemical percentage of intramuscular fat was determined from longissimus dorsi muscle. A multi-locus mixed-model was applied for statistical analyses. Results: Analyses revealed four loci (rs43284251, rs109210955, rs41630030, and rs41642251) to be highly associated ($-{\log}_{10}P$>12) with IMF located on chromosome 1, 6, 13, and 17, respectively. The frequency of their minor alleles was 0.426, 0.221, 0.162, and 0.106. Conclusion: The loci above can be useful in selection programs and gives the possibility to assist selection by molecular tools.

• Food Science of Animal Resources
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• v.30 no.2
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• pp.190-197
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• 2010

The present study was conducted to determine the effect of tannery waste protein concentrate (TWPC) on fattening of cattle and the carcass and meat quality, with the aim of replacing the costly commercial protein concentrate (Jasoprot) with a more economical and effective alternative. Twelve young cattle (six male and six female) were fed during the study period on a control diet (T1) with 10% Jasoprot and on two test diets: 5% TWPC + 5% Jasoprot (T2) and 10% TWPC (T3). The test diets significantly affected (p<0.05) live weight gain and profitability compared to the control diet, perhaps due to the increased protein and essential amino acid content, relative to Jasoprot. TWPC was free of aflatoxin. Sensory-evaluated organoleptic scores did not differ among the groups. Chemical composition was normal as other beef and was non toxic especially within recommended chromium level ($1.90{\pm}0.6{\mu}g$) Total lipid contents were higher (p<0.05) in T3, and moisture, ash and crude protein contents were almost similar (p>0.05) among the three groups. It is concluded that TWPC or an equal mixture of TWPC and Jasoprot may be an economic and efficient alternative protein source to Jasoprot in the cattle industry, which minimizes adverse effects on carcass and sensory meat quality.

• Asian-Australasian Journal of Animal Sciences
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• v.12 no.6
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• pp.843-845
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• 1999

To evaluate direct and maternal effects on calf market weight (CMW) and carcass weight (CW) in Japanese Black cattle under an animal model, genetic parameters were estimated using 51,320 records of CMW and 11,944 records of CW, respectively. Direct and maternal heritabilities, and direct-maternal genetic correlation were estimated to be 0.22, 0.06 and 0.27 for CMW, and 0.23, 0.12 and -0.40 for CW, respectively. Correlation coefficient between maternal breeding values for CMW and CW was 0.521 for 157 sires appeared in both CMW and CW data sets. These results suggest that the maternal genetic effect on pre-weaning growth carries over to carcass weight. Maternal breeding values for both calf market weight and carcass weight could be used as the indicator traits of maternal ability in Japanese Black cattle.

• Korean Journal of Veterinary Research
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• v.9 no.2
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• pp.37-42
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• 1969

A survey on the Eperythrozoon infection of cattle was conducted by means of examinations of Giemsa staining blood films obtained from 2,263 cattle which had been fed in the middle and south parts of Korea. On the other hand, continuous hematological examinations to five splenectomized calves were performed. The results obtained were summarized as follows: 1. Eperythrozoon wenyoni were detected in the blood films of five cattle from Kyungpook and Cheju areas. 2. The infections of Eperythrozoon wenyoni were observed in four of five splenectomized calves from Taegu and Sungwhan areas. 3. From these results it is considered that the infections of Eperythrozoon wenyoni in cattle are quite common in the middle and south parts of Korea.

• Journal of the korean veterinary medical association
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• v.15 no.9_10
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• pp.497-504
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• 1979

1. Incidence rate of bovine tuberculin reaction dairy cattle in 1971 was $0.20\%$ and then reduced somewhat in 1972 to $0.04\%$, but increased up to $0.16\%$ in 1977 and to $0.15\%$ in 1978. Average incidence fo

• Korean Journal of Veterinary Research
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• v.35 no.1
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• pp.159-167
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• 1995

The relationship between palpable ovarian structure and milk progesterone levels were determined in 144 dairy cows. Depending on the ovarian structure and diseases were divided into two groups, Group I (absence of functional luteal tissue in ovary and <2ng/ml in milk progesterone levels) and Group II(presence of functional luteal tissue in ovary and ${\geq}2ng/ml$ in milk progesterone levels) 1. Among 69 cows of group I, dysfunction of ovary, atropy of ovary, follicle is ovary, follicular cyst and corpus luteum albicans were 17(11.8%), 19(13.2%), 14(9.7%), 3(2.1%) and 16 cows(11.1%), and among 75 cows of group II, corpus luteum A, B and C were 16(11.1%), 17(11.8%) and 42 cows(29.2%), respectively. 2. In Group I, milk progesterone concentrations were <1ng/ml in 55 cows(79.9%). Conversely in Ggroup II, milk progesterone concentrations were ${\geq}4ng/ml$ in 55 cows(73.3%). 3. The mean(${\pm}SE$) concentrations of milk progestsrone in the Group I and II were $1.62{\pm}0.45$ and $7.64{\pm}0.68ng/ml$, respectively, and CR test showed the difference in milk progesterone concentrations between the two groups to be statistically significant(p<0.01). 4. The mean(${\pm}SE$) concentration of milk progesterone in cows with corpus luteum A, B and C were $8.11{\pm}1.83$, $8.48{\pm}1.30$ and $7.12{\pm}0.82ng/ml$, respectively, there was no significant relationship between palpable corpora luteum structure and milk progesterone concentration. 5. The accuracy of ovarian diagnosis was 82.6 and 20.2% in the Group I and II, respectively, and Chi-square test showed the difference in accuracy between the two groups to be statistically significant (p<0.001). 6. The agreement between the rectal palpation and milk progesterone concentrations in ovarian disease was 50%.

• Journal of the korean veterinary medical association
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• v.16 no.2
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• pp.67-71
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• 1980

In order to find out the anthelmintic efficacy upon intestinal parasites of domestic animals, a single dose of Rintal (generic name; Febantel) was administered orally against 10 heads of helminthes-infested dairy cattle and 21 heads of helmintesinfested s

• Asian-Australasian Journal of Animal Sciences
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• v.16 no.5
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• pp.635-638
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• 2003

Japanese Black cattle (Wagyu) are fed for a long period to produce high quality beef, however, extended feeding often causes inefficiency and greater environmental load mainly derived from their manure. The objectives of this study were to analyze changes in feeding length by listing breeding values (BVs) at calf markets and the relationships between BVs and carcass characteristics of 4,052 Japanese Black cattle, and to examine the feasibility of optimizing feeding length by referring to listed BVs. BV classes A, B, and C were defined based on BVs of cows in Shimane Prefecture as follows: an upper quarter of BVs was classified as A, a second quarter as B, and under the average as C. For cattle sold at calf markets in the first term of 1996, just before the start of BV listing, the feeding length of cattle with class B BVs for the beef marbling standard (BMS) was longer (p>0.05) than that of class A cattle. However, in the second term of 1996, just after the start of BV listing, the feeding length of class B cattle became shorter (p<0.001) than that of class A cattle. Then, the feeding lengths of both classes showed no significant differences. Feeding lengths of both class A and B BVs for carcass weight (CW) changed similarly to the corresponding BV classes for BMS. The analysis of the relationships among the listed BV classes and the actual carcass characteristics showed that class A cattle had a higher (p<0.001) BMS than class B cattle, and that the higher-class cattle had a heavier CW (p<0.05). On the basis of previous reports, the cattle, particularly those with lower genetic marbling ability, seem to only increase marbling at markedly low efficiency for a few months before slaughter. Therefore, the finding that carcass characteristics corresponded to their class of BVs suggests that an optimum feeding length based on listed BVs not only increases the efficiency of beef production, but also reduces the environmental load.

• Asian-Australasian Journal of Animal Sciences
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• v.33 no.1
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• pp.4-11
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• 2020

Objective: Puerarin has the potential of regulating the differentiation of preadipocytes, but its mechanism of action has not yet been elucidated. Adipocytes found in adipose tissue, the main endocrine organ, are the main sites of lipid deposition, and are widely used as a cell model in the study of in vitro fat deposition. This study aimed to investigate the effects of puerarin on adipogenesis in vitro. Methods: Puerarin was added to the culture medium during the process of adipogenesis. The proliferation and differentiation of bovine preadipocytes was measured through cell viability and staining with oil red O. The content of triacylglycerol was measured using a triglyceride assay kit. The mRNA and protein expression levels of adipogenic genes, peroxisome proliferator-activated receptor-γ (PPARγ) and CCAAT/enhancer-binding protein-α, were measured using quantitative real-time polymerase chain reaction and western blotting, respectively. Results: The addition of puerarin significantly increased adipogenesis of bovine preadipocytes and enhanced the mRNA and protein level expression of PPARγ (p<0.01). The expression of P-Akt increased after adipogenic hormonal induction, whereas puerarin significantly increased PPARγ expression by promoting the Akt signaling component, P-Akt. The mechanism of adipogenesis was found to be related to the phosphorylation level of Ser473, which may activate the downstream signaling of the Akt pathway. Conclusion: Puerarin was able to promote the differentiation of preadipocytes and improve fat deposition in cattle. The mechanism of adipogenesis was found to be related to the phosphorylation level of Ser473.