How can we increase the milk production of dairy cows and the nutritional content of dairy cows? We must provide high quality roughage for dairy cows. The so-called high-quality roughage refers to roughage with high digestion and utilization rate. Feeding such roughage can ensure the energy requirement of the cow during life-keeping and milk production, and there is a sufficient amount of acetic acid for the synthesis of milk fat, such as alfalfa hay and sheep. Grass and so on. In view of the fact that the roughage of dairy cows in China is based on corn stalks, and the crude protein content of corn stalks is low, measures should be taken to increase the crude protein content of corn stalks or corn silage. It has been proved that the quality of high-quality roughage in dairy cows is too low, and the content of acetate in the rumen will be reduced, which will lead to a reduction in milk fat synthesis.
Therefore, in order to ensure a higher milk fat percentage and milk production of dairy cows, a high proportion of quality roughage must be supplied. The amount of roughage should not be less than 50% of dry matter in general.
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Nucleic Acid (DNA/RNA) Extraction Kit
1. Introduction
The total viral nucleic acid extraction kit is suitable for extracting total viral nucleic acid from serum, plasma, tissue homogenate and other samples. The kit is based on silica column purification technology, which eliminates the need for toxic phenol-chloroform extraction and time-consuming alcohol precipitation. This product has successfully extracted nucleic acids from hepatitis B A/C, hepatitis C, and norovirus standard. The obtained DNA/RNA can be directly used in a series of downstream experiments such as PCR, RT-PCR, and LAMP.
Notice:
1. The carrier RNA solid must be dissolved in Nuclease Free Water to 1µg/µl before use, and vortex to dissolve. Store in aliquots at -70°C. If you need to store it at -20℃ for a long time, please repackage it according to the number of times of use.
2. Dissolve Proteinase K (20mg/ml): Add Proteinase Dissolve Buffer to dissolve Proteinase K to a final concentration of 20mg/ml. Proteinase K dry powder can be stored at 2-8°C for one year, but dissolved Proteinase K must be stored in aliquots at -20°C. Repeated freezing and thawing of Proteinase K can affect its activity.
3. Buffer VHB must be diluted with 14 ml absolute ethanol before use and stored at room temperature.
4. Buffer RW2 must be diluted with 80 ml of absolute ethanol before use and stored at room temperature.
3. Shelf life
Except for Proteinase K and Carrier RNA, other components of this product can be stored at room temperature (15-25°C) for 12 months, and should be stored at 2-8°C for long-term storage. Proteinase K and Carrier RNA dry powder are transported at room temperature. Please store at -20°C after receiving the test product, and store at -20°C after dissolving.
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