Tapki and Guzey
Greener Journal of Agricultural Sciences Vol. 3 (11), pp. 755-761, November 2013.
Manuscript Number: 072913763
Genetic and Phenotypic Correlations between Linear Type Traits and Milk Production Yields of Turkish Holstein Dairy Cows
*Ibrahim Tapki and Yusuf Ziya Guzey
Agriculture Faculty, Department of Animal Science, University of Mustafa Kemal, 31034
*Correspondance Author’s Email: itapki @ mku.edu.tr or ibtapki @ gmail.com,
Tel:+90 326 245 58 45, Fax: Tel:+90 326 245 58 32
The main objective of this study was to estimate the
phenotypic and genetic correlations between 18 linear type
traits and three production yields in the first lactation of
Turkish Holstein dairy cows. In this study, 78 sires having
at least 5 daughters and their 2721 daughters were used.
Heritabilities ranged between 0.12 to 0.44. The phenotypic
correlations between type traits and milk yield ranged from
-0.31 to 0.29; -0.23 to 0.26 for fat yield and -0.29 to 0.25
for protein yield. Genetic correlations between linear type
traits and milk yield ranged from -0.46 to 0.42; -0.41 to
0.42 for fat yield and -0.45 to 0.45 for protein yield. The
high genetic correlations between angularity, udder depth,
rear teat position and milk, fat and protein yields were
0.42, 0.40, 0.45; -0.46, -0.41, -0.45 and -0.46, -0.41,
-0.45, respectively. In addition to high genetic
correlations between these type of traits and low
heritabilities recorded for rear udder height, body
condition score, central ligament and locomotion traits were
-0.77, 0.61, 0.65 and 0.59, respectively. The genetic
correlations showed that higher yielding cows were more
angular, have deeper udders, good rear teat position, high
rear height, moderate body condition score, strong central
ligament and long stride locomotion type traits. These
results indicated that the opportunity of direct and
indirect selection schemes for milk, fat and protein yields
could be achievable within a national progeny-testing
programme using these type traits within a selection index.
Keywords: phenotypic, genetic, correlations, type traits, production, Turkish Holstein cows
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