ATATÜRK ÜNiVERSiTESi MORKARAMAN SÜRÜSÜNDE YAPAĞI VE SÜT VERiMi ÖZELLiKLERiNiN FENOTipiK VE GENETiK PARAMETRE TAHMiNLERİ

Abstract

OZET Bu arastirmada Ataturk Universitesi Ziraat Fakultesi Isletmesinde yetistirilen ergin Morkaraman koyunlarinm dort yillik yapagi verimi ve. ozellikleri ile uc yillik sut verimi ve ozelliklerine tesir eden yil. yas ve yil X yas interaksiyonu gibi cevre faktorleri en Kucukkareler Metoduna (Least-Squares Procedure) gore anaHz edilmis, variyasyon kaynaklarinin kareler ortammalarina ait beklenen degerlerindeki variyans unsurlan ise yine Tam En Kucuk-Kareler teknigine dayanan metodlarla tahmin edilmistir. GENETic AND PHENOTYPIC PARAMETERS FOR FLEECE AND MilK CHARACTERisTicS iN ATATURK UNiVERSiTY MORKARAMAN FLOCK 1. ESTiMATES OF PHENOTYPIC PARAMETERS. SUMMARY The effect of same' important enviromental factors on fl·eece characteristics, body weight at shearing and the traits characterizing lactation mil k yield of mature Morkararnan ewes raised in Ataturk University far,m in Erzurum t;ave been estimatedl. There have heen used 670 {for 4 years), 591 (for 3 years) and 583 (for 3 years) production records respective Jy. The main purpose of this study was to determine the possibility of Morkararnan sheep improvement th~ough selectian The effects of year, age and year x age interaction on production traits'were analysed by the met had of least-squares presented by Harvey (1960). In addition, covariance analyses were used to eli minate the effects of individual pe riod alfferences on total milk yi~ Id. maximum daily milk yield, ar. verage daily mlik yielo, butter fat yield and to test the significance ofthese environmental factorso The variance components due to enviromental factors were ,estimated by the complate least-squares analyses. The least-squares means of greasy fleece weight, clean fleece weight, staple lenght, body 'Neight at shearing. total milk yield, maximum daily milk yield, averaga daily milk yield. butter fat yield and milking period of mature (2-6 years old) Markaraman. ewes were 1428:::22 g; 984± 16 g 117=1.3 g; 53.6 ±3.1 Kg; 79354 ,± 1698 ml; 1072 ± 18 'ml; 560 ±9 ml; 4067 ± 112 g and 140 ± 1.4 days respectively Mqrkaraman ewes generally yielded less than the other native sheep breeds for aLi the studied production traits, except body weight at shearing A noticeable phetlOtypic variation. esp~cially in the milk yield traits was ,observed. Non-signffjcant environmental factors were found on greasy fleece weight and clean 'fleece weight, The effects of years on total milk Yield, average daily milk yield were sigr:ificant (p:! < .05) but not on stapile length. butter fat yield and milking period were highly significant (p < .01). Age had significant effect (p< .05) on staple lenght and highly significant (p<.01) effect on butter fat yield. While the effect of age x year interaction on total mill... yield was significant (p <·05), but not on body weight at shearing average dally mlik yield and maximum dailY milk yield was highly sigJlificant (p < .01). The part due to the effects of environmefltal factors was 9 per cent in staple length, 17 per cent in body weight at shearing, 17 per cent in total milk yield, 14 per cent in maximum daily milk yield, 24 per cent in average daily milk yield, 16 per cent in butter fa.t yield and 45 per cent in milk· ing period. It was detei mined by the covariance analyses that the effect due to environmental fac· tors on total milk yield, maximum daily milk yield, averag~ daily milk yield and butter fat yield Wer'e 37, 28, 52 and 27 per cent respectively. In the analyses o~ covariance, the environmental factors, i. e, years, ages and regression had highly significant (p < .01) effect on all the studied mi'!k characteristics. The least-squeres means by the covariance analyses for total milk yield, maximum daily miik 'yield, average .daily milk yield and butter fat yield were 79996 ± 5393; 1078±69; 560:±46 and 4110 ± 327 respectively