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KMID : 0359320000400020383
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Korean Journal of Veterinary Research
2000 Volume.40 No. 2 p.383 ~ p.391
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Studies on health management and nutritional evaluation by milk components analysis in dairy cows
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Abstract
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Milk urea nitrogen (MUN) determination is being used an indicator of the proteinenergy 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±standard deviation of MUN and MP concentration in the herd were 15.6±2.1㎎/㎗ and 3.23±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 〉 8.0㎎/㎗ (10.0%) or 〉 higher than 25㎎/㎗ (15.4%) relative to the cows in MUN content of 12.0∼17.9 ㎎/㎗ (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.
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