Phenotypic variability and relationship between early growth traits of lambs Pirot breed

摘要

The growth of farm animal is an economically important trait which can be interpreted mathematically. The study aims to figure variability and correlation characteristics of lambs Pirot sheep population at early life stage. The records of lambs' bodyweight at birth (BWB), at 30 days (BW30), at 60 days (BW60), at 90 days (BW90) were the subject of analysis.The male lambs were heavier than females at early growth stages from birth to 90 days of age with percentage differences of 1.72% (.06 kg) at BWB, 10.10% (0.89 kg) at BW30, 3.58% (0.52 kg) at BW60, 5.60% (1.14 kg) at BW90. Sex of lambs has a significanteffect (P<0,01; P<0.05) on BW30 and BW90. Year significantly affect body weights of lambs (P<0,01) at BW60, (P<0.05) atBW30 and BW90. The interaction of sex*year significantly affected BW30 of lambs (PO.05). A positive correlation obtained between body weights ranges from r=. 131 tor=.413.