First lactation yields of milk, fat, and protein from Holstein cows in New York and California were used to obtain REML estimates of (c0)variances for yield traits using a multitrait animal model. Data from each state were split randomly into 10 samples, averaging 5504 cows per sample from California and 5078 from New York. Mean heritability estimates for milk, fat, and protein yields were .30 f .02,
An animal model with a REML algorithm was used to estimate variances of additive genetic effects and interaction effects of sire and herd. Milk and fat yields were analyzed for fmt, second, and thrd lactations of Holsteins from California, New York, and Pennsylvania. Twenty samples of data were used in the study: 10 from California, 4 from New York, and 6 from Pennsylvania. Abbreviation key: c2 = fraction of variance that was due to sire and herd interaction effects, CA = California records, NYP = New York and Pennsylvania records.
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