• 한국축산시설환경학회지
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• 제20권4호
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• pp.173-176
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• 2014

This study was conducted to investigate the effect of weaning period on the vocalization frequency of Hanwoo calf. Twelve Hanwoo calves were allocated into 4 groups, control (forced weaning on 90days) and treatment (weaning on 70, 90 and 120days with 5 adaptation days). After weaning, behavior and vocalization of Hanwoo calves were recorded on 3 consecutive days with closed circuit television (DTC-R5254, Digite Co., Ltd., Korea) and digital audio tape recorder (SR-900, Idamtech Co., Ltd., Korea). Vocalization frequency of Hanwoo calf were not significance difference with control and treatment group. Thus, additional studies of feed intake and body weight gain were needed to determine the weaning period of Hanwoo calves.

• 한국수정란이식학회지
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• 제30권3호
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• pp.189-193
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• 2015

Calculating break-even price of calf production is closely associated with reproductive efficiency. To determine the price, we need data from reproduction records including number of claves weaned, number of cows exposed for breeding, and annual cash coast per cow, and average weaning or market weight of claves sold and retained. Unfortunately, the data were not available in Korea native cow (Hanwoo). To evaluate the performance and the price, we collected calving interval from about 60,000 cows for last 10 years and estimated reproductive performance. Calving interval was increased 4.3% and pregnancy rate was decreased about 1.4~2.8% year-on-year. Increases in growth rates of number of cow and semen per calf supported the low reproductive performance. Finally, break-even price was calculated using estimated percent calf crop and demonstrated that growth rate of break-even price is larger than that of annual cash per cow, suggesting cow-calf profitability and financial efficiency in Korea native cow (Hanwoo) is getting worse.

• Journal of Animal Science and Technology
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• 제63권5호
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• pp.1114-1125
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• 2021

Supplying a sufficient amount of high-quality colostrum is a prevailing challenge in Hanwoo calf production systems. This study aimed to describe the efficiency of a lacteal-derived colostrum replacer versus natural bovine colostrum (from Holstein) fed to Hanwoo calves. Forty newborn Hanwoo calves (25 males and 15 females; 30.7 ± 3.15 kg body weight [mean ± standard deviation]) were blocked by sex and birth weight and fed either natural colostrum or a commercial colostrum replacer. Calves displayed a narrow difference in the evolution of body weight and structural body dimensions when they received a commercial versus natural colostrum. Minor differences existed in the starter and total dry matter consumption between calves fed natural or commercial colostrum. Although the colostrum source had no significant effects on days to first diarrhea (average of 7.6 days; p = 0.17), the duration of diarrhea was longer in natural colostrum-fed calves (3.2 vs. 4.5 days; p = 0.04). Consumption of natural colostrum resulted in greater mean serum immunoglobulin G (IgG) on day 2 (14.7 vs. 10.8 ± 0.92 mg/mL) and day 7 (8.21 vs. 5.12 ± 0.82 mg/mL) of calf life, resulting in a greater proportion of commercial colostrum-fed calves (50% vs. 15%; day 2) to experience failure of passive transfer of immunity (serum IgG < cutoff point of 10 mg/mL). Overall, growth rate, body frame development, and incidence of diarrheal disease were not different in both groups. These results suggested that the colostrum replacer product tested in this study could be an alternative to natural colostrum derived from Holstein cow in securing calf growth and health in Hanwoo calf-rearing operations.

• 현장농수산연구지
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• 제13권1호
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• pp.103-114
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• 2011

본 연구는 설문조사를 통하여 한우 송아지의 이유월령이 거세한우의 출하체중 및 송아지 폐사에 미치는 영향을 조사하고자 수행되었다. 설문은 방문을 통하여 진행되었고, 조사된 총 농가수는 862농가로서, 가임암소사육규모별 조사 농가수는 10~19두 188호, 20~49 364호, 50~99두 227호, 100두 이상 83호로 나타났다. 이유시기는 3개월령 농가의 비율이 40.4%로 가장 높게 나타났으며, 각 사육규모별로도 3개월령이 가장 높은 비율을 차지하였다. 이유월령 3개월을 초과하는 각 사육규모별 농가의 비율은 10~19두 규모가 53.5%로서 가장 높게 나타났으며, 20~49두 규모 37.5%, 50~59두 규모 43.7%, 100두 이상 규모는 39.0%로 조사되었다. 조사 농가의 사육규모는 거세한우 출하개월령, 출하시 생체중 및 도체중에 영향을 미치지 않았다. 그러나 이유월령의 증가와 도체중은 유의적으로 음(-)의 상관관계를 가지고 있는 것으로 조사되었다. 따라서 도체중은 이유월령이 짧을수록 증가하는 것으로 나타났다. 조사 농가의 평균 한우 송아지 폐사율은 5.6%로 나타났으며, 사육규모는 한우 송아지의 폐사율에 영향을 미치지 않았다. 반면에 이유월령과 한우 송아지 폐사율 및 폐사 원인인 설사 비율은 유의적으로 양(+)의 상관관계를 가지고 있는 것으로 조사되었다. 따라서 한우 송아지 폐사율은 이유월령이 짧을수록 감소하는 것으로 나타났다. 본 설문조사의 결과, 이유시기의 단축은 거세한우의 도체중 증가와 송아지 폐사율 감소의 효과로 한우 번식우 농가의 수익성을 향상시킬 수 있음을 보여주고 있다.

• 한국동물생명공학회지
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• 제39권2호
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• pp.121-130
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• 2024

Background: This study focused on reproductive traits in Hanwoo cattle, specifically the environmental factors affecting gestation length and birth weight. Methods: The records of 1,540 cows calved at the Hanwoo Research Institute from 2015 to 2023 were examined. This study analyzed two populations, line-breeding Hanwoo (LBH) and general Hanwoo (GH), with all cows undergoing estrus synchronization and artificial insemination. The R software was used to compare the differences between the two populations and analyze the environmental factors affecting each trait. Results: The results showed that the average gestation length for LBH was 283.28 ± 5.93 days, which was significantly shorter than that of the GH, which had an average of 285.63 ± 6.21 days (p < 0.001). The average birth weight of LBH calves was 25.10 ± 3.69 kg, significantly lighter than GH calves, which weighed 27.26 ± 4.11 kg on average (p < 0.001). Analysis of environmental factors revealed significant differences in the gestation length of LBH based on dam parity, year, and season of calving. However, no significant differences were observed based on calf sex. For LBH, birth weight showed significant differences based on dam parity, year of calving, and sex of the calf, but not the season of calving. In GH, gestation length varied with dam parity and calving season, but not with calving year or calf sex. The GH birth weight showed differences based on dam parity, year of calving, and calf sex, but not the season of calving. Conclusions: Reproductive traits in the Hanwoo cattle industry are economically vital but are heavily influenced by environmental factors due to their low heritability. An accurate evaluation of the genetic potential of these traits requires an analysis of the environmental factors affecting them. The results of this study serve as foundational data for predicting the potential for genetic improvement in the gestation length and birth weight of Hanwoo cattle.

• 한국수정란이식학회지
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• 제32권3호
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• pp.171-176
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• 2017

본 연구는 한우 송아지 생산효율 향상을 위한 농가 번식 실태를 조사하였다. 한우 사육 규모별, 지역별로 나누어 45개 농가의 가임암소를 대상으로 조사를 실시하여 다음과 같은 결과를 얻었다. 한우의 최초 분만월령은 평균 28.7개월령이었다. 수태당 인공수정 횟수는 $1.45{\pm}0.32$회였으며, 분만 후 인공수정 일수는 119.8일이었다. 수태율은 소규모 농가가 $75.2{\pm}16.93%$로 중규모($70.6{\pm}17.46%$) 및 대규모 농가($71.4{\pm}11.03%$)보다 높은 것으로 나타났다. 번식률 상위 농가의 사육 방식을 보면, '발정관찰 보조기구를 사용하는 농가'가 '그렇지 않은 농가'보다 송아지 생산율이 10.42% 높았다. 번식소에 대해 IBR과 BVDV 예방접종을 실시한 농가는 유사산 폐사율이 4.41% 감소한 것으로 나타났다. 또한 농가여건에 따라 방목과 운동을 한 경우, 수태율과 분만율이 각각 3.47%, 18.29% 향상되는 것으로 나타났다. 본 조사 결과를 통해 발정관찰, 예방접종, 방목이 한우농가에서 송아지 생산 효율을 높이는데 중요한 지표로 나타났다. 한우 사육 농가의 번식실태 조사를 통해 농가 현장의 번식률 향상을 위한 연구 자료로 활용이 가능할 것이다.

• 현장농수산연구지
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• 제10권1호
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• pp.201-205
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• 2008

For the prevention of Hanwoo calf diarrhea, the floor in a cattle shed was flamed using liquefied petroleum gas (LPG) in an attempt to substitute for the chemical disinfection method. Before flaming, litter on the floor was removed and cleaned. Outbreak rate of diarrhea in calves vaccinated with ScourGuard 3K^® was decreased from 70% to 30% and the effect of the flame disinfection lasted for three to four months.

• 한국동물위생학회지
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• 제45권4호
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• pp.337-342
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• 2022

Calf diarrhea is a major health concern in the livestock industry that requires accurate analysis for appropriate treatment. Dehydration and electrolyte imbalance are the most significant consequences of diarrhea in calves. Until now, the reference values of blood analysis of Hanwoo neonatal calves have not been well known. Recently, portable blood analyzers have made it possible to immediately analyze blood in the farm and provide suitable treatment for the patients. We analyzed electrolytes, blood urea nitrogen (BUN) and glucose in the blood of 179 Hanwoo neonatal calves, including 79 with diarrhea. These 179 calves were divided into 3 groups based on their age. Values of sodium (Na⁺ ) and glucose were significantly lower in diarrheic calves (1~30 days), while potassium (K⁺ ) and chloride (Cl^- ) values were higher in diarrheic calves (1~30 days). BUN values, which are closely related to dehydration due to diarrhea, increased in diarrheic calves of all ages. Therefore, these data can be used as reference values for blood analysis and treatment of healthy or diarrheic Hanwoo neonatal calves within 30 days of age.

• 대한수의학회지
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• 제62권4호
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• pp.32.1-32.4
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• 2022

A Hanwoo cow with a delayed gestation and abdominal distension was delivered following PGF_2α injection. There was excessive amniotic fluid, and a male calf was delivered but died immediately. The calf had no eyes and nose, and a cleft palate on the upper jaw. Gross appearance and computed tomography image showed that upper teeth were spread out on both sides due to cleft palate in the upper jaw, and lower jaw and teeth were positioned upward. There were no other brain parts except cerebellum. These findings show a rare case of hydramnios related to fetal congenital deformity in a Hanwoo cow.

• 한국작물학회:학술대회논문집
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• 한국작물학회 1998년도 21세기 한반도 농업전망과 대책(한국작물학회.한국육종학회 공동주관 심포지움 회보)
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• pp.68-111
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• 1998

The structure of the Hanwoo (Korean Native Cattle) Industry remains very weak and vulnerable to the WTO/IMF system. Considering that the majority of cattle farmers are small sized, and that marketing systems are outdated and inefficient, rapid expansion of lower priced beef imports by WTO system and rapid increasing of production costs by IMF system would lead to the deprivation of a regular source of farm income and threaten the stability of rural life. Accordingly, the Hanwoo industry should be expanded in accordance with progress in the implementation of (1) programs for the structural adjustment and (2) measures to compensate for the loss. Efforts for lowering major production factor costs needs to continue, In order to increase the supply of calves at low cost, the programs of collective cow-calf farms should be expanded, thereby reducing the cost of calf purchase, which constitutes the largest share of Hanwoo production cost. Also, feedlot operations should be encouraged for small herd farms in order to achieve a substantial saving in beef production costs by integrated operations from calf production to cattle fattening. A substantial saving would also be made by collective purchase and distribution of various inputs through the cooperatives' channels. Extension services should be strengthened for cattle farm management, cattle care and feeding, prevention of cattle disease, etc. In order to minimize cash outlays for commercial mixed feeds, utilization of far by-products as feeds should be enhanced and production of forage crops productive of resources, such as land and rural labor, during the farm o(f-season, needs to be encouraged. Also, technological development for enhancing the nutritional value of farm by-products should be encouraged. Measures for successful segregation of the Hanwoo beef market should be implemented, thereby enhancing incentive for quality beef producers and protecting consumers willing to pay higher price for quality beef. For development of the Hanwoo industry, a considerable time frame would be required in order for (1) small livestock farmers to make a successful adjustment by staying in the enterprise and achieving increased price efficiency (2) livestock farmers to acquire know-how for producing quality Hanwoo beef, (3) the ongoing Government policy of enhancing price-quality competitiveness, and for improving the quality Hanwoo beef marketing to take root. (4) consumers to increase their ability to distinguish meat quality, and others.