The aim of this study was to investigate the culling reasons in cows milked once-a-day (OAD), evaluating the differences of production, fertility and traits other than production (TOP) between retained and culled cows. Cows in different lactations from Massey University Dairy 1 were scored for 18 TOP for three consecutive seasons from 2013 to 2015. Herd-test records were used to estimate milk yield (MY), fat yield (FY), protein yield (PY) and somatic cell score (SCS). Low fertility, poor udder conforma-tion and low production were the main reasons for culling in all seasons. Overall, culled cows had a lower MY (3534±56 kg), FY (173.5±2.8 kg), PY (138.5±2.1 kg) and higher SCS (6.41±0.09) than retained cows (MY = 4006±41 kg; FY = 204.7±1.9 kg; PY = 160.6±1.5; SCS = 6.19±0.06). Culled cows had a poorer adaptability to milking (7.02 ± 0.04) and poorer farmer’s overall opin-ion (7.62±0.06) than retained cows (7.23±0.03 and 7.89±0.04, respectively). Moreover, culled cows had a weaker udder support (5.56), weaker front udder (5.48) and lower rear udder (6.01) than retained cows (6.19, 5.85 and 6.25, respectively). These traits might have a higher influence on the culling decisions of OAD dairy farms than the age and production worth of cows.
Proceedings of the New Zealand Society of Animal Production, Volume 77, Rotorua, 200-204, 2017
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