Predicting Daughter Milk Production from Dam Index
نویسندگان
چکیده
منابع مشابه
Heritability Estimates of Milk Production from Daughter on Dam Regression by Year and Management Level
Heritability estimated by year of freshening for firstqactation milk records of artificially sired Holstein cows in the northeastern United States from daughter on dam regression averaged about .34 on the linear scale and .31 on the logarithmic scale. Little change could be detected from 1965 to 1982. Number of daughterdam pairs was 197,338. Heritability estimates on the .5 and .4 power scales ...
متن کاملComparison of heritability estimates from daughter on dam regression with three models to account for production level of dam.
Three models were used to estimate heritabilities for milk yields at different production levels and for different years as twice the regression of daughter residual effects on dam residual effects. The denominator is the residual mean square for dams. The numerator is the difference between the residual term for sum of dam's and daughter's records and sum of residual terms for records of dams ...
متن کاملEffectiveness of national and regional sire evaluations in predicting future-daughter milk yield.
National and regional bull evaluations were compared for ability to predict standardized milk yield of future daughters. Correlations between evaluations and first-, second-, and third-parity yields of future daughters were calculated within herd-year-month group. Mean correlations with predicted yield of future daughters across the United States were higher for national (0.109, 0.111, and 0.08...
متن کاملAge of cow and age of dam effects on milk production of Hereford cows.
Milk production in Hereford cows was studied utilizing 2,487 lactation records on 926 cows. Data were collected over 17 yr (1968 to 1984) from two related herds. Estimates of daily milk yield were obtained at bimonthly intervals by the calf suckling technique. The sum of three monthly measures (TMY), a predicted sum of seven monthly observations (PMY) and 205-d weight of the calf were studied. ...
متن کاملPrenatal Maternal and Possible Transgenerational Epigenetic Effects on Milk Production
This study investigated whether the prenatal maternal environment in dairy cattle influences the postnatal milking performance of the resulting daughters and grand-daughters. Linear mixed models were used to analyse whole season milk production from ∼ 46,000 Jersey and ∼ 123,000 Holstein Friesian cows in their 1st and 2nd lactations. Variation in the prenatal environment was associated with a s...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 1976
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(76)84334-2