V. Ujică


CONTRIBUTIONS TO THE STUDY OF CURRENT GENETIC VALUE OF CHAROLAISE SIRES FROM FRANCE

V. Ujică, V. Maciuc, I. Nistor, E.C. Popescu, C. Nistor

Abstract
In France the beef cattle are well represented by specialized race, and in first place as number, genetic value distribution area is Charolaise race. Using data from official control and race herdbook from 2009 we conducted a study to see the current genetic value of bulls for the some selection index. After we processing statistic data result that calving ease index have an average of 96.39 0.241 with a standard deviation of 8.65, and the synthetic weaning index has an average of 110.82 0.156 with a standard deviation of s = 5.614, values with a precision of CD = 0.86. The analyzed indices had a medium to height genetic determinism like: IFNAIS h2 0.29; ISEVR - h2 0.25; CRsev - h2 0.32; DMsev h2 0.27; DSsev - h2 0.34; AVel - h2 0.23; ALait - h2 0.42; IVMAT - h2 0.21. The genetic, phenotypic and environmental correlation between selection indices was different as intensity and sense. The correlations between calving ease index and CRsev, DMsev, DSsev were negative with moderate intensity; between IFNAIS and ISEVR positive correlation with moderate intensity; between IFAIS and AVel, ALait, IVMAT are positive and very strong correlation. In the end was made the classification of sires in which 916 bulls (70.7%) were in RVS class (recognized for quality of calves at weaning day), 34 bulls in RQM class (recognized and confirmed for maternal quality), 86 bulls (6.6%) in RR3P class (recognized for the third time), 16 bulls (1.2%) in RRB class (recognized for their quality for meat production), 11 bulls (0.9%) was in RRE class (recognized like elite sires) and 233 (18,0%) young bulls qualified or recommended for reproduction. From all analyzed sires the most valuable bull was SAPRISTI code 8504242227 for calving ease index (value 145) qualified in RR3P class; the most valuable for muscle development was LANZAC cod 1295106604 (DMsev= 135); for the ISEVR index was the same SAPRISTI (137). This exceptional value may contribute to improvement of morphologic and productive traits and meat attributes of cows.

Key words: Charolaise race, selection indices, genetic amelioration