Threshold Models Applied to Holstein Conformation Traits
نویسندگان
چکیده
منابع مشابه
Genetic Analysis of Postnatal Mortality and Calving Traits in Iranian Holstein Herds Using Threshold-Linear Models
This study was conducted to estimate the additive genetic components of calf mortality in the first month of age, calving difficulty, and birth weight in Holstein dairy cows in the central regions of Iran. The records comprised 61,200 calves born between 1990 and 2011 from 60 dairy herds. Different threshold-linear models in three groups of univariate, bivariate, and multivariate models were us...
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Charolais sires can be mated to Montbéliard or Holstein dairy cows to produce crossbred calves sold for meat production. Heritabilities and correlations between traits can differ when they are calculated within Charolais × Montbéliard or within Charolais × Holstein population. Moreover, the genetic correlation between the same trait measured on Charolais × Montbéliard and on Charolais × Holstei...
متن کاملDetection of Quantitative Trait Loci Affecting Leg Conformation Traits in Danish Holstein Cattle
Strong legs and feet give longer herd life of dairy cows. Therefore, many countries include measures of leg and feet conformation traits in their breeding programs, often as early predictors of longevity. Five leg conformation traits were measured on grand-daughters of 19 Danish Holstein sire families with 33 to 105 sons. The traits measured were: rear legs side view, rear legs rear view, hock ...
متن کاملGenetic correlations between longevity and conformation traits in the Czech Holstein population
Genetic correlations between longevity and conformation traits were estimated using data on Czech Holstein cows first calved in the years 1993–2008. Longevity traits considered were length of productive life and number of lactations initiated and their functional equivalents (i.e. the longevity traits corrected for milk production). Conformation traits were twenty one linear descriptive type tr...
متن کاملDetection of quantitative trait loci affecting lameness and leg conformation traits in Danish Holstein cattle.
Lameness is an important factor for culling animals. Strong legs and feet improve herd life of dairy cows. Therefore, many countries include leg and feet conformation traits in their breeding programs, often as early predictors of longevity. However, few countries directly measure lameness related traits to include these in a breeding program. Lameness indices in 3 different lactations and 5 le...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 1991
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(91)78505-6