A study on the inheritance and phenotypic and genetic interrelationships among some physiological and productive variables in Jersey cows : a thesis presented in partial fulfilment of the requirements for the degree of Master of Agricultural Science, Massey University of Manawatu, New Zealand

Abstract

Field studies were made on mixed age, lactating Jersey cows (130 dams and 143 daughters) from 18 herds in the district of Manawatu (New Zealand) during the summer of 1963-64 with the following objectives : (i) to measure the variation present in the physiological variables ; (ii) to estimate the heritability of the physiological variables ; (iii) to estimate phenotypic correlations between the physiological variables ; (iv) to estimate genetic correlations between the physiological variables ; (v) to estimate phenotypic correlations between the physiological variables and the productive variables ; and (vi) to estimate genetic correlations between the physiological variables and the productive variables.