Vaishnav, M. R.Kalawadia, R. L.2018-05-152018-05-151994http://krishikosh.egranth.ac.in/handle/1/5810046183The present investigation was aimed to compare some methods of estimation of heritability and genetic gain in Gir cattle. The data on various characters of Gir cattle were collected for first three consecutive lactations of 475 cows (daughters) of 54 sires, covering the period 1965-1991. Data were subjected to statistical analysis. Heritability for various characters related to first lactation was estimated by paternal half sib correlation and intra-sire regression of daughter on dam methods and that for three lactations by paternal half sib method. The Smith's method was employed to estimate phenotypic gain (trend) for various characters. The genetic gain was estimated by three methods viz., Smith's method I, Smith's method III and Narain and Garg's method. In both the cases the ratio of SE to estimate was used to judge the efficiency of the method.enAGRICULTURAL STATISTICS, AGRICULTURECOMPARISIONThesis