T. IVANOVA, E. RAICHEVA and N. METODIEV
Institute of Animal Science, EG - 2232 Kostinbrod, Bulgaria
IVANOVA, T., E. RAICHEVA and N. METODIEV, 2006. Score estimation of gain of male lambs from Ile De France breed. Bulg. J. Agric. Sci., 12: 607-611
The aim of study was to work up method for score estimation of gain of male lambs from Ile de France breed with different type of birth. The study was carried out on 48 male lambs with different type of birth from the flock of Institute of Animal Science - Kostinbrod, born in years -2004 and 2005. On the basis of live weight 10,30 and 70 days age were calculated average daily gain between 10-30 and 30-70 days of lambs and average gain, which was used as a base for determination of score 0. The age for determination of average daily gain and class interval between the scores was conformable to requirements of selection of Ile de France breed. It was established significant higher average daily gain between 10-30 and 30-70 days of twins born in 2004 (P < 0.05) however the percentage of their score estimation was higher in negative part of chart. The score estimation that was worked up is an easy for doing method to class according to individual productivity and will use for calculation of breeding indexes of ewes and rams.