| Studies on health management and nutritional evaluation by milk components analysis in dairy cows III. Relationship between conception rates, and milk urea nitrogen and milk protein concentration in a large dairy herd of high yielding cows |
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Jin-san Moon1, Yi-seok Joo1, Gum-chan Jang1, Yong-dhuk Yoon1, Bo-kyeun Lee2, Young-ho Park3, Chang-ho Son4 |
1National Veterinary Research and Qurantine Service, MAF
2Agribrands Purina Korea Inc.
3College of Veterinary Medicine, Seoul National University
4College of Veterinary Medicine, Chonnam National University |
| 젖소에서 유성분 분석을 통한 영양상태 평가 및 건강관리에 관한 연구 III. 고능력우 위주의 대규모 목장에서 우유중 단백질과 요소태질소 수준이 수태율에 미치는 영향 |
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문진산1, 주이석1, 장금찬1, 윤용덕1, 이보균2, 박용호3, 손창호4 |
1국립수의과학검역원
2(주)퓨리나코리아
3서울대학교 수의과대학
4전남대학교 수의과대학 |
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| Abstract |
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Milk urea nitrogen (MUN) determination is being used an indicator of the protein-energy balance in dairy herds. A faulty balance can be corrected to optimize milk production and animal health. This parameter is regarded as a potential tool to evaluate suboptimal feeding practices and reproductive disorders. Therefore, the purpose of this study was to investigate the response of milk composition by regular feeding analysis and to compared the relationship between MUN and milk protein(MP) and fertility at the insemination period in Holstein dairy cows. Total of 355 artificial insemination (AI) for 150 Holstein cows in the herd were used to examine the relationship between MUN and MP content and conception rate. The AI occured for the cows 50 to 150 day in milk, and MUN and MP concentration were determined using automated infrared procedures. The mean${pm}$standard deviation of MUN and MP concentration in the herd were $15.6{pm}2.1mg/dl$ and $3.23{pm}0.38%$, respectively. MUN contents of bulk milk were increase by elevated crude protein intake. The conception rate was lower in the cows in which the level of MUN was lower than > 8.0mg/dl (10.0%) or > higher than 25mg/dl (15.4%) relative to the cows in MUN content of 12.0~17.9 mg/dl (36.7%) at the time of insemination. Also, lower MP than 3.0% or higher MP than 3.25% were associated with a lower conception rates. Consequently, MUN and MP analyses may be used serve as a monitoring tool of protein and energy nutritional balance to improve reproduction efficiency in Holstein dairy cows. |
| Key Words:
cow, milk urea nitrogen, milk protein, fertility, crude protein |
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