• Title/Summary/Keyword: 분만젖소

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Estimation of environmental effects and genetic parameters for somatic cell score, stress and immunological traits in Holstein cattle (젖소에 있어서 원유 중 체세포수, 스트레스 및 면역물질에 대한 환경효과와 유전모수 추정)

  • An, Byeong-Seok;Seo, Guk-Hyeon;Gwon, Eung-Gi
    • Journal of Animal Science and Technology
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    • v.48 no.1
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    • pp.9-14
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    • 2006
  • Milk yield and its quality traits determine the dairy enterprise profitability and sustainability. Milk quality traits including somatic cell counts (SCC) is an upcoming economic challenge for dairy farming community in Korea. This study estimated the effect of parity, stage of lactation (early, mid and late lactation) on SCC, stress (blood cortisol) and immunity (blood IgG, lymphocyte and neutrophil) traits, their heritabilities and genetic correlations between them. SCS and blood neutrophil count were significantly affected by both parity and stage of lactation, however; IgG was affected by only stage of lactation, and blood cortisol and lymphocyte were not affected by both factors. The SCS has shown increasing trend with the parity, however; the difference between first and second parity, second and third parity were not significant. The SCS in early (≤90 days) and late lactation (181≤days) were higher than that of mid lactation (91~180 days). Cortisol concentration in blood was lowest in fourth parity, however; the differences among the first three parties were not significant. The IgG was higher in fourth parity compare with first parity however; all other comparisons were noted non-significant. The IgG concentration was significantly higher in early lactation than those of mid and late lactation. The blood lymphocytes were decreased with increasing parity however the differences beyond second parity were not significant. The neutrophils were increased with the increasing lactation stage however; the difference between early and mid lactation was not significant. Although heritability of SCS was still lower, but it was meaningful value (0.09) and may be considered to improve milk quality. The genetic correlations between SCS and cortisol (-0.96), and lymphocyte (-0.76) were highly negative. Heritability of cortisol was low, however genetic correlations between cortisol and lymphocyte (0.79) was highly positive. IgG with medium heritability was correlated negatively with lymphocyte (-0.88) and neutrophil (-0.98). Lymphocyte was lowly heritable and highly correlated with neutrophil concentration (0.87).This study suggested that cortisol, IgG, lymphocyte and neutrophil being positively genetically correlation with somatic cell score could be used as alternative traits to enhance milk quality in Holstein cattle. Further studies are warranted to estimate genetic relationships between immunological and production traits to increase the genetic merit of Holstein cows for milk yield, to improve animal health and economic viability under intensive management system.

Effect of Claw Trimming on Milk Yield and Its Composition in Lactating Dairy Cows (젖소에 있어서 삭제(削蹄)가 유량 및 유성분에 미치는 영향)

  • Baek K.S.;Park S.B.;Park S.J.;Kim H.S.;Kim J.G.;Lee W.S.;Lee H.J.;Ki K.S.;Hur T.Y.;Kang S.J.;Suh G.H.;Jeon B.S.;Ahn B.S.
    • Journal of Embryo Transfer
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    • v.21 no.1
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    • pp.45-51
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    • 2006
  • This study was carried out to investigate effect of claw trimming on milk yield and its composition in Holstein at different lactation stages. 1 . There was no difference in daily milk yield between control and claw trimming in early, mid and late lactating Holsteins. 2. Somatic cell count (SCC) was lower in early lactation and it was higher in late lactation when claws were trimmed in Holstein. However, claw trimming did not affect SCC during mid lactation in Holstein. 3. Milk fat, protein and total solids were decreased during late lactation in Holstein after claw trimming. However, milk composition was not affected by claw trimming in early and mid lactating Holsteins.

A Suvey on Satisfaction Measurement of Automatic Milking System in Domestic Dairy Farm (자동착유시스템 설치농가의 설치 후 만족도에 관한 실태조사)

  • Ki, Kwang-Seok;Kim, Jong-Hyeong;Jeong, Young-Hun;Kim, Yun-Ho;Park, Sung-Jai;Kim, Sang-Bum;Lee, Wang-Shik;Lee, Hyun-June;Cho, Won-Mo;Baek, Kwang-Soo;Kim, Hyeon-Shup;Kwon, Eung-Gi;Kim, Wan-Young;Jeo, Joon-Mo
    • Journal of Animal Environmental Science
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    • v.17 no.1
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    • pp.39-48
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    • 2011
  • The present survey was conducted to provide basic information on automatic milking system (AMS) in relation to purchase motive, milk yield and quality, customer satisfaction, difficulties of operation and customer suggestions, etc. Purchase motives of AMS were insufficient labor (44%), planning of dairy experience farm (25%), better performance of high yield cows (19%) and others (6%), respectively. Average cow performance after using AMS was 30.9l/d for milk yield, 3.9% for milk fat, 9,100/ml for bacterial counts. Sixty-eight percentage of respondents were very positive in response to AMS use for their successors but 18% were negative. The AMS operators were owner (44%), successor (44%), wife (6%) and company worker (6%), respectively. The most difficulty (31%) in using AMS was operating the system and complicated program manual. The rate of response to system error and breakdown was 25%. The reasons for culling cow after using AMS were mastitis (28%), reproduction failure (19%), incorrect teat placement (12%), metabolic disease (7%) and others (14%), respectively. Fifty-six percentages of the respondents made AMS maintenance contract and 44% did not. Average annual cost of the maintenance contract was 6,580,000 won. Average score for AMS satisfaction measurement (1 to 5 range) was 3.2 with decrease of labor cost 3.7, company A/S 3.6, increase of milk yield 3.2 and decrease of somatic cell count 2.8, respectively. Suggestions for the higher efficiency in using AMS were selecting cows with correct udder shape and teat placement, proper environment, capital and land, and attitude for continuous observation. Systematic consulting was highly required for AMS companies followed by low cost for AMS setup and systematization of A/S.

Immunological Activity of Bovine Colostral Whey Protein Containing TGF-β from Imsil Province (임실지역 젖소 초유로부터 분리한 TGF-β 함유 유청 단백질의 면역활성)

  • Yang, Hee-Sun;Oh, Hyun-Hee;Choi, Hee-Young;Park, Jong-Hyuk;Kim, Kyoung-Hee;Oh, Jeon-Hui;Jung, Hoo-Kil
    • Food Science of Animal Resources
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    • v.32 no.3
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    • pp.339-345
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    • 2012
  • This experiment was carried out in order to separate bovine colostral whey protein from Imsil province and to test the effect of immunological activity on RAW 264.7 cells. The colostral whey protein contained TGF-${\beta}$ 7, 475 pg/g in total. We first tested the effect of the colostral whey protein on the proliferation of RAW 264.7 cells and it demonstrated cytotoxicity at concentrations greater than 20 mg/mL. Therefore, the immunological activities of colostral whey protein were investigated in maximum concentration of 10 mg/mL on LPS-induced RAW 264.7 cells. Results indicated that colostral whey protein inhibited the LPS-induced nitric oxide (NO) production in a dose-dependent manner. The colostral whey protein also suppressed the productions of proinflammatory cytokines (TNF-${\alpha}$, IL-$1{\beta}$, IL-6) in a dose-dependent manner. In addition to the immunological activity, colostral whey protein led to the expression of heme oxygenase-1 (HO-1) in RAW 264.7 cells. In conclusion, colostral whey protein containing TGF-${\beta}$ inhibited the production of NO, TNF-${\alpha}$, IL-$1{\beta}$, and IL-6 via expression of HO-1.

Environmental and Physiological Factors on Milk Yields and Compositions of Holstein Cows in Korea (Holstein 젖소에 있어서 유량 및 유성분에 미치는 환경 및 생리적 요인)

  • Han, K.J.;Ahn, J.H.;Lee, D.H.
    • Journal of Animal Science and Technology
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    • v.46 no.3
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    • pp.335-346
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    • 2004
  • Factors associated with milk urea nitrogen on milk yield and milk composition were investigated in this study regarding feeding management and Physiological status of lactating cows. The data for 3 years between 1999 and 2002 for this study were collected from 129,645 cows by Korean Agricultural Cooperatives Federation. The objectives of this study were to describe the relationships between milk urea concentrations and seasonal factors, cow factors and production of milk, milk fat, protein and somatic cell score(SCS). Milk urea was highest in summer and it also showed a nonlinear association with milk yield. Milk yield was higher at milk urea concentrations of 21 ${\sim}$ 24mg/dl, however it decreased at higher level of milk urea concentrations than 24mg/dl. Milk urea was higher with increased parities of cows and in particular, at 3 to 4 parities. There was a negative association between milk urea and SCS in milk. SCS in milk was lowest at milk urea concentrations of 2l${\sim}$24mg/dl. Milk fat and milk protein were greatly affected by days in milk(DIM), year of birth, season and milk urea concentrations, respectively. While milk urea increased in summer, milk fat and protein were decreased. Milk protein decreased according to longer days in milk. With regard to the influences of parity, milk protein in overall was negatively correlated to milk urea in all lactations, however the extent of decrease of milk protein at high concentrations of milk urea was bigger at third lactation. The balanced supply of energy and protein to the animals might have greatly affected the urea concentrations and protein content of milk.

Development of International Genetic Evaluation Models for Dairy Cattle (홀스타인의 국제유전평가를 위한 모형개발에 관한 연구)

  • Cho, Kwang Hyun;Park, Byoungho;Choi, Jaekwan;Choi, Taejeong;Choy, Yunho;Lee, Seungsu;Cho, Chungil
    • Journal of Animal Science and Technology
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    • v.55 no.1
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    • pp.1-6
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    • 2013
  • This study was aimed to solve the problems of current national genetic evaluation systems in Korea and its development to pass the verification processes as required by International Bull Evaluation Service (Interbull). This will enable Korea to participate in international genetic evaluation program. A total of 1,416,589 test-day milk records with calving dates used in this study were collected by National Agricultural Cooperative Federation from 2001 to 2009. Parity was limited up to fifth calving and milk production records were adjusted to cumulative 305 day lactation. The pedigree consisted of 2,279,741 animals where 2,467 bulls had 535,409 parents. A newly developed multiple trait model was used in calculation of breeding values for milk yield, milk fat, and protein yield. Data were edited with SAS (version 9.2) and R programs, and genetic parameters were estimated using VCE 6.0. Results showed a continuous increase in genetic potentials, in general, and no remarkable differences were found between performances by parity. Except fat yield, potentials in milk yield and protein yield were well calculated. We found an increased number of daughters per each top ranked 1,000 bulls in recent years of calf births compared to the cases of previous evaluations. Of the bulls ranked top 100 by our new models (multiple-trait models) we found that increased numbers of bulls were included. Of twenty eight bulls born in 2006, twenty bulls born in 2007 and eight bulls born in 2008 that were listed by new models, only 23, 12, and 2 bulls born in respective years were represented on top 100 by old single-trait models. Re-ranking of the daughters or sires by multiple-trait models suggest that this new multiple trait approach should be used for dairy cattle genetic evaluation and seed-stock selection in the future to increase the accuracy of multiple trait selection. Breeding values for these traits should also be calculated by new method for international genetic evaluation.

Study on Production of In Vitro Embryos and Twin Calves by Embryo Transfer in Korean Native Cattle (한우 체외수정란의 생산과 이식후 쌍자 생산에 관한 연구)

  • 김용권;김진성
    • Korean Journal of Animal Reproduction
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    • v.24 no.1
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    • pp.97-108
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    • 2000
  • The objectives of this study were performed to increase the efficiency of the culture conditions of embryos produced in vitro, and to assess the developmental potential after transfer of those embryos into recipients. The mean number of folliclular oocytes recovered from an ovary was 10.7. The rates of maturation and fertilization in Grade I oocytes were significantly (P<0.05) higher than Graden and III. Developmental rate into blastocyst in the culture group of TCM-199 with BOEC were significantly higher (P<0.05) than the groups of TCM-199 and conditioned medium (24.7% vs. 12.4% and 18.2%). The survivability of post-thawed blastocysts equilibrated for 3 min in EFS solution was significantly (P<0.05) lower than l0 for 1 and 2 min (32.1% vs. 82.9% and 73.3%). Significantly higher (P<0.05) survival rate in blastocysts was seen after freezing than in morulae stage embryos. Out of all 105 recipients, 49 (46.7%) were confirmed in pregnant. On pregnancy of cattle, 48 calves were born from 40 recipients. The ratio of twin and single calves was 30.5% (32/40 and 7.6% (8/40), respectively. However, the others composed of abnormal, as judging as 6 (12.2%) for abortion and 3 (6.1%) for stillbirth during the pregnant period.

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Studies on Dairy Farming Status, Reproductive Efficiencies and Disorders in New Zealand (I) A Survey on Dairy Farming Status and Milk Yield in Palmerston North Area (뉴질랜드 (Palmerston North) 의 낙농 현황과 번식 및 번식장해에 관한 연구(I) Palmerston North 지역의 낙농 현황과 우유 생산량에 관한 조사 연구)

  • 김중계;맥도날드
    • Korean Journal of Animal Reproduction
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    • v.24 no.1
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    • pp.1-18
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    • 2000
  • Eighty dairy farms in Palmers ton North area in New Zealand were surveyed on 1) general characteristics (10 Questions), 2) milk yield and feed supplementary (7 questions), 3) reproductive efficiencies (12 questions) and 4) reproductive disorders (12 questions) by mail questions from February to July, 1998. Among those 4 items from 38 dairy farms (47.5%), especially in items 1) and 2), overall dairy farming situation, supplementary feeding and milk yields were surveyed and analyzed for Korean dairy farmers (especially in Cheju island) to have better understanding or higher economical gains. The results were as follows. 1. In dairy experience, 21 (45%) among 38 dairy farms surveyed were answered that farming less than 15 years, 15~19 year, 20~25 years and over 26 years experience were 3 (7.9%), 7 (18.4%), 6 (15.8%) and 5 (13.2%) which generally showed longer experience compare to Korean dairy farming situation. In survey of labour input and business goal of dairy farming, self-managing farms, sharemilkers, unpaid family manpowering farms, manager running farms, farms with hired worker, farms with part time helper and other type was 21 (55.3%), 10 (26.3%), 2 (3.5%), 3 (5.3%), 18 (31.6%), 2 (3.5%), and 1 (1.8%), respectively. 2. Analyzing pasture and tillable land, pasture according to feeding scale (200, 300 and 400 heads) were 56, 90 and 165.3 ha, and tillable lands were 51, 78 and 165 ha which showed some differences among feeding scale. In recording methods in 38 farms replied, 36 (95%) dairy handbook and 23 (70%) dual methods taking farms were higher than that of 10 (26.3%) computer and 15(39.5%) well-recorder methods. 3. Dairy waste processing facilities in environmental field were almost perfect except of metropolitan area, and so no problem was developed in its control so far. Hence, 26 farm (68.4%) of pond system was higher rather than those in 8 (21.2%) of using as organic manure after storing feces of dairy cattle, 1(2.6%) bunker system and 3 (7.9%) other type farms. 4. In milking facilities, 33 farms (86.9%) of Harringbone types were higher than those in 3 (7.9%) of Walkthrough types, 1 (2.6%) of Rotary system and other types. Although the construction facilities was not enough, this system show the world-leveled dairy country to attempted to elevate economic gains using the advantage of climatic condition. 5. In milking day and yearly yield per head, average 275 milking days and 87 drying days were longer than that of 228 average milking days in New Zealand. Annual total milk yield per head and milk solid (ms) was 3,990 kg and approximately 319 kg. Dairy milk solid (ms) per head, milk yield, fat percentage was 1.2 kg, 15.5 kg and average 4.83% which was much higher than in other country, and milk protein was average 3.75%. 6. In coclusion, Palmerstone North has been a center of dairy farming in New Zealand for the last 21 years. Their dairy farming history is 6~9 year longer than ours and the average number of milking cows per farm is 355, which is much greater than that (35) of Korea. They do not have dairy barn, but only milking parlors. Cows are taken care of by family 0.5 persons), are on a planned calving schedule in spring (93%) and milked for 240~280 days a year, avoiding winter. Cows are dried according to milk yield and body condition score. This management system is quite different from that of Korean dairy farms. Cows are not fed concentrates, relying entirely on pasture forages and the average milk yield per cow is 3,500 kg, which is about 1/2 milk yield of Korean dairy farms. They were bred to produce high fat milk with an average of 4.5%. Their milk production cost is the lowest in the world and the country's economy relies heavily on milk production. We Korean farmers may try to increase farming size, decreasing labor and management costs.

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