Estimation and Comparison of Economic Values for Productive Characters in Hybrid and Native Cattles of Guilan Province

At this experiment was studied information of income and costs of 20 crossbred herds at Guilan province included Lahijan (7 herds), Amlesh (1 herd), Rezvanshahr (3 herds) and Masal (9 herds) cities. The equations were estimated for economic cofficients of milk production, fat percentage, protein percentage and herd life in maximum profit interest and and minimum cost price interest. For crossbred cow equations for economic cofficients of milk production (Rial/kg/cow/year), fat percentage (Rial/cow/year), protein percentage (Rial/cow/year) and herd life (Rial/day/cow/year) in maximum profit interest were (739, -60261, -30672 and 28), and minimum cost price interest (-0.24, 19.89, 10.12 and -0.01), Respectively. In native cows, the economic weights of these traits in maximum profit interest were 232, -6242, -3177 and 454 and minimum cost price interest -0.11, 3.2, 1.6 and -0.23. Economic weights of fat percentage and protein percentage were negative in minimum cost price interest and positive in maximum profit one. In both interest, economic weights of milk production and herd life had more importance than others. The relative economic weights of the traits were equal in both interests. The relative economic weight of herd life (to milk production) was positive in most cities so that increase in economic efficiency of production system for this trait was higher than others in the same direction to milk production.