Some udder traits and growth of lambs and phenotypic correlations between those of traits with milking traits and milk production measured by various milk estimation methods in Bafra sheep


ÜNAL N., Akcapinar H., ATASOY F., YAKAN A. , UĞURLU M.

ANKARA UNIVERSITESI VETERINER FAKULTESI DERGISI, cilt.55, ss.117-124, 2008 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 55 Konu: 2
  • Basım Tarihi: 2008
  • Dergi Adı: ANKARA UNIVERSITESI VETERINER FAKULTESI DERGISI
  • Sayfa Sayıları: ss.117-124

Özet

The aims of the study were to evaluate udder morphology and lamb growth and correlations between those of traits with milk production and milking traits in Bafra sheep. The study was conducted at Amasya - Gokhoyuk State Farm in 2006. A total of 70 Bafra ewes were randomly assigned to three groups: 20 ewes and their 40 lambs in Weight-Suckle-Weight (WSW) group; 25 ewes in Oxytocin plus Machine Milking (OMM) group; 25 ewes in Machine Milking (MM) group. All ewes had twin lambs. Milk production was measured by using three techniques (WSW and OMM and MM). Udder traits and milking characteristics were determined on the days of 42 and 70 and 98 of lactation. The data were analyzed using the Least Squares Means Procedures. All udder traits except teat-floor distance were increased as lactation progressed. The positive and significant (p<0.05, p<0.01, p<0.001) correlations were observed between udder depth and width and circumference with daily milk yield and lactation milk yield in OMM and MM groups. Conversely, negative and significant (p<0.05, p<0.01, p<0.001) correlations were obtained between teat-floor distance and daily milk yield and lactation milk yield in both groups. Phenotypic correlation coefficients between daily milk yield and milk flow rate with lactation milk yield on the different days of lactation were high and significant (p<0.001) in positive direction. The correlations between milking duration and lactation milk yield were negatively obtained for OMM group, but positively in MM group. Lamb live weight and daily milk yield was highly correlated in WSW group. There was a high and significant (p<0.001) correlation coefficient (0.570) between daily milk yield during whole lactation period and live weight gains of lambs during pre-weaning period. All lambs were survived during the study. No ewe milked by machine showed clinical mastitis.