CHANGE IN ECONOMIC WEIGHTS OF THE TRAITS CHARACTERIZING MILK YIELD AND PARAMETERS OF INDIVIDUAL COAGULATION ABILITY OF MILK IN HOLSTEIN CATTLE BREED AT DROPPING ON MILK QUOTAS

D. Yordanova, T. Angelova, V. Karabashev, G. Kalaydhziev, Y. Popova, S. Laleva, J. Krastanov, N. Oblakov, M. Cassandro

Abstract: The purpose of this study is to establish change in economic weights of the traits characterizing milk
yield and parameters of individual coagulation ability of milk in Holstein cattle breed in Bulgaria at
dropping on milk quotas.
Evaluation of economic weights. Evaluation of economic weights done by: Programs for Calculating Economic Weights in Livestock), Version 5.1.1. Part 1: Programs EWBC (Version 2.2.1) and EWDC (Version 2.1.2) for Cattle by Jochen Wolf, Marie Wolfová and Emil Krupa (2011).
It is significantly increasing economic importance in the level of milk yield, while other traits are expected to reduce their values drop of milk quotas.
The hardness of curd is very close to their economic weights with those of the components of milk (% fat and proteins). They have a similar amendment to their values in dropping out of the milk quota system.

Keywords: economic weights; individual coagulation ability of milk; milk production

Date published: 2017-02-08