• Journal of the Korean Institute of Educational Facilities
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• v.8 no.5
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• pp.30-39
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• 2001

• Journal of Embryo Transfer
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• v.25 no.1
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• pp.21-27
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• 2010

The increase in the total number of cows on farms, which breed Korean Native Cattle (KNC), is associated with many problems. In particular, the services per conception and calving interval have increased. In this study, we examined the effect of dietary supplementation with vitamin and mineral complex on the estrus rate, pregnancy rate, gestation length, and birth weight of KNC calves. Multiparous or primiparous KNC were divided into 3 groups with 40 heads per group. Experimental group 1 was administered a consisting of 35,000 IU vitamin A, 100 IU vitamin E, 200 mg $\beta$-carotene, 200 mg Zn methionine, and 1.5 mg Se. Experimental group 2 was administered a vitamin complex (100 g/day) consisting of 100 IU vitamin E and 200 mg $\beta$-carotene. In the case of multiparous KNC, the estrus detection rate in the control group was 90.0% and those in the experimental groups were 75.0% to 95.0%. However, the first-service pregnancy rate after parturition in the control group was 41.2%, which was significantly lower than that in the experimental groups (71.0% to 76.7%; p<0.05). The average duration of pregnancy in the group supplemented with the vitamin complex was days, which was similar to that in the case of the control group. The birth weight of calves from cows fed with vitamin complex was 25.3 to 27.0 kg, which was similar to that in the case of the control group (25.2 to 26.0 kg). In the case of primiparous KNC, no differences in the estrus rate, pregnancy rate, gestation length, or the birth weight of calves were noted between the groups. Thus, dietary supplementation vitamin and mineral complex have no effect on the reproductive efficiency in primiparous cows, but the pregnancy rate was observed to have increased in multiparous KNC with these supplements.

• Reproductive and Developmental Biology
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• v.33 no.3
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• pp.179-182
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• 2009

This study was carried out between November 2007 and October 2008 in the experimental farm of Chunnam National University to investigate the effect of feeding of whole crop barley silage on the reproductive performance of Hanwoo heifers and cows. Two diets, rice straw or whole crop barley silage separately from concentrate were fed 11 Hanwoo heifers and 26 Hanwoo cows. In control group (=CON), heifers (n=6) and cows (n=13) were fed 7 kg (/head) rice straw and 4 kg (/head) commercial diet. In whole crop barley silage group (=WBG), heifers (n=5) and cows (n=13) were fed 8 kg (/head) whole crop barley silage and 1 kg (/head) commercial diet. 1. Conception rates for first service in CON or WBG heifers were 66.7% (4/6) and 60.0% (3/5), respectively, and the services per conception cows were $1.5{\pm}0.2$ for CON and $1.4{\pm}0.2$ for WBG group. 2. Days to post-partum insemination were $106.6{\pm}26.3$ days for CON and $85.6{\pm}12.6$ days for WBG group, and days to post-partum conception in CON or WBG were $128.4{\pm}27.1$ and $96.8{\pm}16.8$ days, respectively. 3. Post-partum conception rates for first service in CON or WBG were 76.9% (10/13) and 84.6% (11/13), respectively, and caving interval was $418{\pm}50.7$ days for CON and $392.8{\pm}20.7$ days for WBG group.

• Journal of Embryo Transfer
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• v.21 no.3
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• pp.177-182
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• 2006

This study was conducted to investigate the effects of melengesterol acetate (MGA) and $PGF_{2{\alpha}}$ administrations on serum progesterone level, synchrony of estrus and conception rates in Han-woo. Firstly, ten heifers and one freematin were fed 0.5 mg MGA/day for 14 days in a grain carrier, and after 19 days of MGA feeding, a single injection of 25 mg $PGF_{2{\alpha}}$ were treated. Blood samples were collected to evaluate serum progesterone concentrations from the start of feeding of MGA until the end of feeding and subsequent estrous detection and artificial insemination (AI) at 3 days intervals, and on days of $PGF_{2{\alpha}}$ injection, estrous detection, AI, and 15th and 60th days after AI. The level of progesterone in the blood began to increase from 7 days after MGA feeding, and 9 days after feeding it became 5.4 ng/ml and maintained that level thereafter. On the 33th day when the $PGF_{2{\alpha}}$ was injected, it reached the peak level of 7.6 ng/ml. However, 2-3 days after $PGF_{2{\alpha}}$ injection, it dropped to 1.4 ng/ml drastically (p<0.05). Secondly, one hundred and ninety four Hanwoo heifers or cows were divided into two groups to compare estrous induction and conception rates: the one treated with MGA and $PGF_{2{\alpha}}$, (n=104) and the other with $PGF_{2{\alpha}}$ treatment (two injections at 11 days interval, n=90). The heifers or cows treated with MGA and $PGF_{2{\alpha}}$ were identical to those used as above. The percentages of heifers or cows showed estrus were higher in the $MGA+PGF_{2{\alpha}}$ treatment (91.3%) than in the $PGF_{2{\alpha}}$ treatment (72.2%, p<0.05). Conception rates were also higher in the $MGA+PGF_{2{\alpha}}$ treatment (94.2%) than in the $PGF_{2{\alpha}}$ treatment (88.9%, p<0.05). The results of this experiment indicate that estrus synchronization using $MGA+PGF_{2{\alpha}}$ is more effective than that using $PGF_{2{\alpha}}$ (two injections) in Hanwoo.

• Proceedings of the KSAR Conference
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• 2003.06a
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• pp.91-91
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• 2003

소의 생산성 향상을 위해서는 번식효율의 증진과 개체의 유전능력을 충분히 발휘할 수 있도록 적절한 사양관리를 실시하여야 한다. 특히 번식관리는 발정관찰로부터 출발하며 발정관찰의 원활한 수행이 없이는 좋은 번식성적을 기대할 수 없다. 그러나 발정관찰은 많은 시간과 노동력이 요구되며 이로 인하여 발정관찰방법과 보조기구가 개발되어 시판되고 있다. 본 연구는 발정관찰의 편리성과 정확성을 개선하고자 (주)한경게놈텍에서 개발한 무인발정관리시스템(HMS)을 활용하여 발정발현양상을 분석하였다. 실험에 공시된 시험축은 안성인근 지역에서 사육되는 35두의 홀스타인 경산우를 선발하였으며, 발정주기에 관계없이 무작위로 선발하여 미근부에 감지센서를 부착하고 감지시간을 0.1초 이상으로 설정하여 매직닥터를 설치하였다. 발정감지횟수와 감지시간의 분석은 승가허용 감지시간이 0.5초 이상인 것만을 승가허용으로 간주하고 분석하였다.

• Journal of the korean veterinary medical association
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• v.47 no.5
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• pp.456-461
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• 2011

최근 홀스타인 경산우는 체격이 대형화함과 동시에 유전적 개량에 의해 비유량이 증가하고 있으나, 비유량이 증가하는 한편, 번식성적의 저하가 전 세계적인 문제로 되고 있다. 미국의 경우, 젖소의 첫 인공수정 수태율은 1951년의 약 65%에서 1996년 약 40%까지 저하하였다는 보고도 있다(Butler 등). 또한 영국에서도 과거 25년간에 수태율이 약 50%에서 35%까지 저하하여 40%를 밑돌고 있으며(Cook 등), 일본의 경우도 마찬가지로 북해도 젖소의 첫 수정 수태율은 40%를 밑돌고 있다는 것으로 미루어 우리나라의 경우도 이와 유사한 성적이나 좋지 않을 것으로 사료된다. 더구나 수태율의 저하와 아울러 분만간격(평균공태일수)는 매년 연장되고, 현재 고능력 젖소에서 번식 성적의 향상은 해결과제로, 세계각국에서는 번식성적저하의 요인 및 대책에 대한 많은 연구가 이뤄지고 있다. 따라서 고능력 젖소에서 유량, 부(負, -)에너지 균형 및 BCS 등이 번식성적에 미치는 영향 등에 대해 국내 외의 수집 논문, 자료 등을 정리하여 대동물임상수의사들에게 도움을 주고자 소개하고 저 한다.

• Journal of The Korean Society of Grassland and Forage Science
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• v.34 no.4
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• pp.283-287
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• 2014

This experiment was conducted to determine methane production and emission factors for a range of roughage diets fed to Hanwoo cows at a level of maintenance energy requirement. Seven cows were fed mixed hay only, 12 cows were fed mixed hay containing 30~50% rice straw and 6 cows were fed a mixed hay diet supplemented with 1.0 kg of wheat bran. Each cow was placed in a metabolic crate for 10 consecutive days, including last 7 days for sampling of feces and urine. At the end of the sampling period, the cows were transferred to an open-circuit respiration chamber for 24 consecutive hours. Methane conversion rate (5.5~6.2%, mean value = 5.8%) and emission factor (33.6~38.6 kg/head/year, mean value = 35.2) were not significantly affected by the diets although the mixed hay only diet resulted in 11 and 15% higher respective rates than the other two. However, in light of the many assumptions that forage with good quality might reduce methane production, additional experiments should be required for participation in the greenhouse gas emission trading system.

• Food Science of Animal Resources
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• v.20 no.2
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• pp.87-92
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• 2000

This study was performed to provide scientific information for consumers and to increase the quality and consumption of Sullungtang prepared with bone from Hanwoo. The physico-chemical, sensory, nutritional properties of Sullungtang by different parity were investigated. The extracting extents of blood were significantly higher for heifer among Hanwoo cows with different parity(none, the second or the fourth) and for back bones among different bone portions (round, hind shank, arm, fore shank or back bone) (p〈0.05). For Sullungtang extracted from bones of heifer was higher in collagen contents than those extracted from cows with the second or the fourth parity. Sullungtang extracted from bones of heifer and cows with the second parity had significantly higher contents of condroitin and viscosity than those of cows with the fourth parity, however there was no significant difference between heifer and cows with the second parity. In color, L values were significantly high, and a and b values were significantly low for Sullungtang extracted from bones of heifer when compared to those extracted from the other cows with the second parity. The contents of total nitrogen, sodium, or calcium were higher for Sullungtang extracted from heifer than those from the cows with the second or the fourth parity. In amino acid compositions, the percentages of glycine were highest and proline and glutamic acid were followed fro all Sullungtang samples from Hanwoo. The results showed that the overall quality of Sullungtang significantly decreased as the parity increased for Hanwoo cows. The Sullungtang extracted from bones of heifer had the best sensory scores as well as nutritional quality when compared to those extracted from the cows with parity. Therefore, the labeling and price for cow bones should be differently evaluated by their parity and age in marketing system.

• Journal of Veterinary Clinics
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• v.29 no.5
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• pp.427-430
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• 2012

An infertile, three-year-old primiparous cow was diagnosed preliminarily with pyometra by rectal palpation at 180 days postpartum. Ultrasonography showed that the cranial portion of the right uterine horn was distended with fluid, while the base portion of the horn was missing. A dense band of tissue connected the cranial portion of the uterine horn to the uterine body. However, the left uterine horn was normal. Gross postmortem analysis of the reproductive organs confirmed the ultrasonographic observations. Histopathological observations also showed that dark red-brown mucus filled the thin-walled right uterine horn, where neither caruncles nor uterine glands were observed. Finally, this primiparous Holstein cow was diagnosed with segmental aplasia of the right uterine horn.

• Korean Journal of Animal Reproduction
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• v.22 no.4
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• pp.359-366
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• 1998

A survey was carried out to investigate the effect of the parity on reproductive traits of Hanwoo(Korean native cows). Data on the reproductive traits of 670 Korean native cows were collected from January, 1996 to December, 1997 and analyzed by the parity. The results obtained were summarized as follows; 1. The average ages at first breeding, first conception and first calving were 443.0, 457.0 and 746.6 days, respectively. 2. The average days to first estrus after calving was 70.1 days and it was shortest in the cows with more than 5 parities (60.4 days) and longest in the cows at 4th parity (79.7 days). 3. The average number of services per conception was 1.53 and it was fewer in the cows at 2nd paity (1.43), but more in the cows with more than 5 parities (1.73). 4. The average days to first conception after calving was 91.2 days and there was a trend that it was longer as the parity of cows increased(p＞0.05). 5. The average length of calving interval was 375.3 days and it was shortest in the cows at 2nd cows (370.8 days) and longest in the cows at 4th parity (395.2 days).