• Asian-Australasian Journal of Animal Sciences
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• 제9권4호
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• pp.461-464
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• 1996

The data on milk yield of 1837 healthy dairy cows of different genetic groups raised in Central Cattle Breeding and Dairy farms, Savar, Dhaka for the period from 1978 to 1992 were analyzed from first to 6th lactation. The mean (SE) milk yields of 100 days, 305 days, total lactation and total life time ($928{\pm}48.6kg$, $2,188{\pm}201.81kg$, $2,661{\pm}385.46kg$ and $11,134{\pm}2,916kg$) respectively, were in pure bred Friesian found to be highest among all genetic groups. The corresponding means in indigenous cows, $334{\pm}12.92kg$, $946{\pm}64.44kg$, $635{\pm}16.31kg$ and $3,934{\pm}402.21kg$ were the lowest. Among the $F_1$, $F_2$ and $F_3$ cross-breds, the $F_1$ half bred Friesian showed the highest performance in milk yield. The half bred Friesian in successive generations yielded low milk. Similar trend was obtained incase of cross-bred with other breeds such as Jersey, Sindhi and Sahiwal. From the over all results, it can be concluded that the performance in respect to milk yield of pure bred Friesian and their $F_1$ half bred with indigenous and Sahiwal were superior over the $F_2$ or $F_3$ cross-breds between Fresian and any other breed irrespective of proportion of blood. The performance in respect to production of indigenous local cow was found to be almost similar with that of Sahiwal breed.

• 생명과학회지
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• 제22권6호
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• pp.794-798
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• 2012

요네병은 Mycobacterium avium subspecies paratuberculosis에 의해 발생하며 반추동물에서 만성 쇠약을 일으켜 전세계적으로 양축산업에 커다란 경제적 손실을 일으키는 질병이다. 본 연구에서는 2008년부터 2009년까지 2년동안 의뢰된 총 3,927건의 국가 종축우의 혈청에 대한 요네병의 항체 양성률에 대해 조사한 결과 21두(0.5%)에서 항체 양성을 나타내었으며 이는 국내 일반 농가의 양성률(1.2-16.4%) 보다 현저히 낮은 수준이었다. 또한 연령별 양성률은 2세 미만에서 0.2% (3두), 2-3세에서 0.4% (2두), 3-4세에서 0.7% (3두), 4세 초과에서 0.9% (13두)로 전 연령에서 양성이 나타났으나 연령이 높아짐에 따라 양성률이 증가하는 경향을 보였다. 품종 별로는 젖소는 모두 음성이었으며 한우에서만 양성률 0.6%를 나타내었다.

• 한국동물위생학회지
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• 제13권1호
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• pp.75-79
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• 1990

Samples of blood were taken from 293 cows and heifers in Koheung, Chonnam, which was dsignated as a place for breeding pure-bred Korean native cattle. Each animal was examined clinically and parasitologically and with the history available considered to be normal at the time of blood collection. The hematology and biochemistry values were determinded, and comparisons were made between three age groups, using the results obtained. All the values obtained were within physiological range : except the alanine aminotransferase values which were higher(P<0.05) in young than in mature or old group of cattle, no significant differences were notred between age groups.

• 대한수의학회지
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• 제27권1호
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• pp.137-140
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• 1987

Information on certain reproductive traits were obtained from field material. The data for this study were taken from 1,111 breeding records of 273 cows and 193 heifers at Koheung, Chonnam, during the period 1979 to 1984. The cattle were bred by artificial insemination; only one or two cattle were reared by one farmer. The heifers were first bred at 551.75 days after they were born; they were pregnant at 569.06 days after birth. The average estrous cycle length was 21 days; the average number of inseminations per conception was 1.56. The non-return rate for first inseminations for cows and heifers was 62.5% and 59.6%, respectively. The gestation length was 285.79 days. Of 1,111 viable calved born 582 were male, giving a sex ratio of 100:110. The average length between calving and first insemination was 88.9 days; average calving interval was 397.69 days.