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service object, the possibility to object, the frequency of fertilization in the interval of the young to fertilization, are regarded as each other.
2 materials and methods
In Norway, from 1996 in September to 1997 in October, 61 to choose from the farm choose 732 cows as the research object, the cows in the dairy cow if breeding Norway, the farm should have seen dramatically higher incidences of ketone disease can select the object history as a farm, all farm must be taken of bolt barn, and in Norway RuChu group of association of registered, 16 researchers monthly to visit and inspect the farm and write down every cow health score. A cow for HeiBaiHua design of visual score technology are adopted, the score is the "5 to 0.25 units increased.
Cows are research group, only young cows in research in process of the object as analysis, reproduction reproduce and ketone disease incidence of related data again by Norway RuChu group of association allow access, from young in 14 days before the young to produce ten days after this period of physical condition rating and cow disease rate of testosterone relationship, in this lab all the cows will be estimates, likewise, including from the first 190 of the gain of DIM health score and cows ketone disease rate of the relationship analysis. Only after the young and fertilization in the cow, would go to estimate production during the young health score and first pregnancy possibility, physical condition rating down and first pregnancy possibility, the relationships between similarly, produced during the young health score and a reproduction of the cow body condition rating down the relationship between are also being investigated, and every time the pregnancy of The Times of cow treatment situation estimate analysis, and will be calculated respectively for 443 cows, these cows in earlier young in 60 days.
Artificial insemination was completely in all farm, ketone disease incidence and first pregnancy as two parameters are research and analysis, and clinical results together, acetone testing experiment (Sollentuna, Sweden) as ketones's diagnosis experiment. Veterinarians do diagnosis and know all the test, only the first ketone disease incidence analysis as a record, ketone disease incidence has many for a cow is concerned, it can repeat again. First litters and prolific treated the same way as the two categories, the https://www.51lunwen.org/norweignthesis/2012/0229/1035235828.html young season in general in chun xia qiu dong season choose different time of different: fall on September 22, to December 21,

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