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Thesis (M.S.)—University of Nebraska—Lincoln, 1970. Department of Animal Science.


Copyright 1970, the author. Used by permission.


The purpose of the study was to evaluate the influence of sex, year, season of birth, interaction of year x season of birth, age of dam and sires on calving interval, birth weight, weaning weight and 18 month weight of Romosinuano cattle. The study was conducted in a hot and humid climate in northwestern Colombia during the periods 1959-1963 and 1964-1967. In the first period the breeding period extended all the year around and in the second only for 4 months. Cows were mated for the first time at about 24 months of age and calves were weaned at approximately 9 months of age. The only source of food was from grazing native pasture.

Advisor: Robert M. Koch