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OJVRTM
Online Journal of Veterinary Research©
Genetic
parameters for udder traits in Holstein cattle.
Salahadin Khodamoradi, Nasser E.J Kashan,
Mehdi Amin Afshar.
Department of Animal Science, College
of Agriculture, Science and Research Branch, Islamic Azad University, Tehran,
Iran.
ABSTRACT
Khodamoradi S, Kashan NEJ, Afshar
MA., Genetic parameters for udder traits in Holstein cattle, 20(7):480-485,
2016. Descriptive
statistics of udder type traits of
35522 Holstein cows from 310 herds are reported. Fore
udder attachment, udder depth, suspensor ligament, front and rear teat
placement, rear udder width and height, and teat length were scored. Genetic
parameters were estimated by multivariate analysis. Models included effect of
herd, year, season of calving, evaluation code and lactation period. Heritability
for teat length was 0.09 and udder depth 0.23.
Genetic correlations between rear udder width and height was 0.41, fore
udder attachment and depth 0.67, front teat placement and rear teat position
0.60, rear teat placement and suspensor ligament 0.56, and udder depth and
suspensor ligament 0.42. The general means of
all traits were lower than the ideal scores but results were within the scope
of previous reports. Results suggest that little response to selection could be expected from
these traits.
Keywords: udder type traits; genetic parameters; dairy cattle.
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