Why don't you try we chloroform method is very simple,  the only problem is the 

Hello Bradi

Concerning the DNA extraction, using cow's blood, i suggest you use the Buffy coat, avoiding excessive red cells. Just like 300 microlitres is ok for the extraction.

Dear Dr Badri

I would recommend that you use with very good results :TRIzol® Reagent allows  perform sequential precipitation of RNA, DNA, and proteins from a single sample

Protein is precipitated from the phenol-ethanol supernatant by isopropanol precipitation. Then  the precipitated RNA, DNA, or protein is washed to remove impurities, and  so resuspended for use in downstream applications.

                                                                                              Best regards.

                                                                                               Dr Otaso

I suggested that you can sum many low DNA sample and precipitate  them using Alcohol 100% (2.5 volume) after overnight incubation at -20C. Use centrifugation  at 140000 rpm for 25-30 min.