Recursive relationships between milk yield and somatic cell score of Canadian Holsteins from finite mixture random regression models
نویسندگان
چکیده
منابع مشابه
Relationships between milk yield and somatic cell score in Canadian Holsteins from simultaneous and recursive random regression models.
Multiple-trait random regression animal models with simultaneous and recursive links between phenotypes for milk yield and somatic cell score (SCS) on the same test day were fitted to Canadian Holstein data. All models included fixed herd test-day effects and fixed regressions within region-age at calving-season of calving classes, and animal additive genetic and permanent environmental regress...
متن کاملApplication of multiple-trait finite mixture model to test-day records of milk yield and somatic cell score of Canadian Holsteins.
Multiple-trait (MT) finite mixture random regression (MIX) model was applied using Bayesian methods to first lactation test-day (TD) milk yield and somatic cell score (SCS) of Canadian Holsteins, allowing for heterogeneity of distributions with respect to days in milk (DIM) in lactation. The assumption was that the associations between patterns of variation in these traits and mastitis would al...
متن کاملGenetic and environmental relationships between body condition score and milk production traits in Canadian Holsteins.
The objective of this research was to estimate genetic parameters of first-lactation body condition score (BCS), milk yield, fat percentage (Fat%), protein percentage (Prot%), somatic cell score (SCS), milk urea nitrogen (MUN), lactose percentage (Lact%), and fat to protein ratio (F:P) using multiple-trait random regression animal models. Changes in covariances between BCS and milk production t...
متن کاملEstimation of Genetic Parameters for Daily Milk Yield, Somatic Cell Score, Milk Urea Nitrogen, Blood Glucose and Immunoglobulin in Holsteins
This study estimated the effects of parity (1-3) and stage of lactation (early, mid and late) on daily milk yield (DMY), somatic cell score (SCS), milk urea nitrogen (MUN), blood glucose, and immunoglobulin G (IgG), their heritabilities and genetic correlations between them in Holsteins (n = 200). Means and standard deviations of DMY, SCS, MUN, blood glucose, and IgG in the experimental herd we...
متن کاملAdjustment factors and genetic evaluation for somatic cell score and relationships with other traits of Canadian Holsteins.
Test day SCC records were obtained from the Ontario DHI and converted to somatic cell score using a logarithmic transformation. Adjustment factors for stage of lactation and calendar month were obtained for first and later lactations. Effects of stage of lactation were significant and followed a systematic pattern. Seasonal effects were small. Sire estimated breeding values for lactation mean a...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 2010
ISSN: 0022-0302
DOI: 10.3168/jds.2010-3470