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- W2024790014 abstract "First lactations from a total of 5802 cows in the North Carolina Institutional Breeding project from 1950 to 1980 were used. Heritabilities from paternal half-sisters were .05 for days open, .05 for age at first calving, .27 for lactation milk yield, and .29 for fat yield. Corresponding estimates from regressions of cow on dam were .13 for days open, .06 for age at first calving, .35 for milk yield, and .33 for fat yield. Genetic correlations between yields and days open from various methods of estimation and editings of the data were all antagonistic and ranged from .35 to .60. Genetic correlations of yield and age at first calving were favorable, ranging from -.10 to -.36. Heritabilities for days open and genetic antagonism between days open and yield were greater for cows calving prior to the hot summer months than for cows calving in the fall. Heritabilities and variance of sires increased for days open and yield traits from the 1950's to 1980. For records from 1970 to 1980, heritability from paternal half-sisters of days open was .12. Genetic increase of 1000 kg milk would result in 5 to 10 additional days open." @default.
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- W2024790014 date "1983-07-01" @default.
- W2024790014 modified "2023-10-13" @default.
- W2024790014 title "Heritabilities and Correlations of Lactation Yields and Fertility for Holsteins" @default.
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- W2024790014 doi "https://doi.org/10.3168/jds.s0022-0302(83)81963-8" @default.
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