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To determine the relationship of test-day (TD) somatic cell score (SCS) to TD and lactation milk yields, 1,320,590 records from Holstein first and second calvings from 1995 through 2002 were examined. All lactations had recorded yield and SCS for at least the first 4 TD. Least square analyses were conducted for yields on TD 2 through 10 within herd and cow. The model included regressions on current...
Three sets of data, standardized 120-day milk yield, corresponding test-day yields and the first two test-day yields of Churra ewes were considered to estimate genetic and environmental parameters of milk yield. A total of 22 599 lactation milk yields and their corresponding 84 488 test-day yields for 12 785 ewes, collected between 1992 and 1994, were used to estimate environmental parameters employing...
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