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Indirect prediction of herd life in Guernsey dairy cattle
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ABSTRACT
Production and type data were used to investigate the relationships of these traits with herd life data in US Guernsey cows that calved from 1985 through 1990. Two definitions of herd life were used: actual days from birth to disposal (true herd life) and herd life adjusted for milk production (functional herd life). Genetic parameters were calculated with data from cows that had an opportunity to reach 84 mo of age (n 18,725). Linear type traits were preadjusted for stage of...
Related newspaper, magazine, and journal articles from HighBeam Research
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Using conformation traits to improve reliability of genetic evealuation for herd life based on survival analysis
Journal of Dairy Science
; ABSTRACT Genetic evaluation for herd life based on survival analysis utilizes information available on all animals, dead (uncensored) and alive (censored), but the reliability of bulls' breeding values depends only on the number of uncensored daughters. Therefore, information on correlated
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Short Communication: Modification of Genetic Evaluation of Herd Life from a Three-Trait to a Five-Trait Model in Canadian Dairy Cattle
Journal of Dairy Science
; ABSTRACT The national genetic evaluation of herd life for Canadian dairy breeds was modified from a 3-trait to a 5-trait animal model. The genetic evaluation incorporates information from daughter survival (direct herd life) and information from conformation, fertility, and udder health traits that
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Impact of Type Traits on Functional Herd Life of Quebec Holsteins Assessed by Survival Analysis
Journal of Dairy Science
; ABSTRACT Survival analysis was used to study the effects of composite and descriptive linear type traits on functional herd life of Quebec Holsteins. Functional herd life was defined as the length of life from first calving to death, culling, or censoring, and was adjusted for 305-d milk
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Survival Rates and Productive Herd Life of Dairy Cattle in the United States
Journal of Dairy Science
; ABSTRACT Survival rates and productive herd life were examined for 13.8 million US dairy cows that calved from January 1, 1980, through March 2, 2005. Cows that left the herd for dairy purposes or were from herds that discontinued Dairy Herd Improvement testing were excluded from any calculations
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Lifetime Profit as an Individual Trait and Prediction of its Breeding Values in Spanish Holstein Cows
Journal of Dairy Science
; ABSTRACT Genetic parameters for lifetime profit and some productive traits were estimated from records of 42,401 Holstein cows with first calving before May 1996 from Navarra and Basque Autonomous Regions of Spain. Profit from the first, first two, and first three lactations were tested as early
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Genetic Analysis of Herd Life in Canadian Dairy Cattle on a Lactation Basis Using a Weibull Proportional Hazards Model
Journal of Dairy Science
; ABSTRACT The objectives of this study were to identify the most important factors that influence functional survival and to estimate the genetic parameters of functional survival for Canadian dairy cattle. Data were obtained from lactation records extracted for the May 2002 genetic evaluation of
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 "The News Letter (Belfast, Northern Ireland)")
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Longevity pays dividends.(Farming Life)
The News Letter (Belfast, Northern Ireland)
; Byline: Alan Armstrong DAIRY industry buzzwords have come and gone over the past 20 years, but one keeps returning to everyday cattle breeding vocabulary. Semex Northern Ireland's general manager, ALAN ARMSTRONG, investigates the meaning of 'longevity' THE past two decades have seen dramatic
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Breeding for productive cows.(Winter Fair)
The News Letter (Belfast, Northern Ireland)
; BREEDING decisions taken today will affect herd profitability for many years. Correct decisions based on facts and not hype will lead to increased herd efficiency and more profit. Profitable cows are the goal of all dairy farmers. Cows that last in the herd are the profitable kind. Farmers know,
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Optimal Replacement Policy and Economic Value of Dairy Cows with Diverse Health Status and Production Capacity
Journal of Dairy Science
; ABSTRACT Understanding optimal replacement practices is essential in milk production management. In this study, we produced a stochastic dynamic optimization model that included the risk of diseases. Moreover, the study took into consideration the genetic production capacity of a cow and the
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Merlin joins Cogent stud.(Farming Life)
The News Letter (Belfast, Northern Ireland)
; NOTABLE lifespan improver, Merlin, has joined the Cogent stud this autumn to provide United Kingdom producers with an excellent combination of production improvement and strength of type for daughters with a long and profitable herd life. Cogent Merlin's lifespan score of +0.3 puts him in the top
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