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  1. 1
    Studies on the peak yield and persistency of lactation in crossbred dairy cows
    由 B.R Dr.Krishnan Nair, C.R Girija
    出版 1980
    Ph.D Thesis
  2. 2
    Evaluation of lactation performance of zebu x taurus cattle in kerala
    由 G Dr.Mukundan, Mathew Stephen
    出版 1983
    Ph.D Thesis
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