Altındere Tarım İşletmesi`nde yetiştirilen esmer sığırlarda döl ve süt verimi ile ilgili özelliklerin fenotipik parametre tahminleri

Abstract

VIII ABSTRACT The purpose of this study is to determine the reproductive and milk yield performance and adaptability of Brown Swiss cattle at Altindere farms. The least-squares means of the number of service per pregnancy, age of the heifers at first breeding, age at first calving, the service period, the pregnancy period, the calving interval were 1.47 ± 0.08, 812.5 ± 21.7 days, 1097.5 ± 21.6 days, 141.3 ± 18.1 days, 285.7 ± 0.9 days and 427.5 ±18.1 days, respectively. The means of lactation milk yield, the daily milk yield, lactation period, dry period were 2040.3 ± 91.2 kg, 2200 ± 98.6 kg, 8836.2 ± 0319.4 g, 230.3 ± 4.9 days and 205.1 ± 24.7 days, respectively. The enviromental factors had no effect on reproductive performances. ( P > 0.05 ) Years were highly significant ( P < 0.01 ) in the milk yield characteristics, except the dry period. Calving season had highly significant ( P < 0.01 ) effect on lactation milk yield and lactation period. Key words : Brown Swiss, reproductive performance, milk yield, phenotypic parameter