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Impact of Type Traits on Functional Herd Life of Quebec Holsteins Assessed by Survival Analysis
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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 production. The dataset contained information from 331,105 cows from Quebec province calving for the first time between 1981 and 1995; 58% of the records had type information. Weibull models were fitted to analyze the data. The hazard function was described as the product of a baseline hazard function and the ...
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Indirect prediction of herd life in Guernsey dairy cattle
; ...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...
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Using conformation traits to improve reliability of genetic evealuation for herd life based on survival analysis
; ABSTRACT Genetic evaluation for herd life based on survival analysis utilizes information...conformation traits with direct information on herd life, nor can they estimate genetic covariances between herd life and conformation traits. In this study...
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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
; ABSTRACT The national genetic evaluation of herd life for Canadian dairy breeds was modified...information from daughter survival (direct herd life) and information from conformation, fertility...that are related to longevity (indirect herd life). Genetic evaluations for direct ...
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Survival Rates and Productive Herd Life of Dairy Cattle in the United States
; ABSTRACT Survival rates and productive herd life were examined for 13.8 million US dairy...for Jerseys. Breed means for productive herd life (through parity 8) ranged from 28 to...number of parities or mean productive herd life on year were negative. The trend for...
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Conference reveals the battle of breeds
; ...farmers whose herds were suffering from poor fertility, short herd life and valueless black and white calves. "Our calves provide a...processing scheme, coupled with anxiety over fertility and herd life, has led to a considerable increase in sales of Friesian semen...
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Genetic Analysis of Herd Life in Canadian Dairy Cattle on a Lactation Basis Using a Weibull Proportional Hazards Model
; ...national genetic evaluation of direct herd life and the survival kit used in this study...breed, survival analysis, functional herd life) INTRODUCTION Longevity is a highly desirable...Further, the economic importance of herd life compared with milk production is considered...
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 "The News Letter (Belfast, Northern Ireland)")
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Longevity pays dividends.(Farming Life)
; ...subject is 'Profitability of Dairy Cow Herd Life' by Congelton and Hill of the University...This demonstrated that extending average herd life from 2.8 lactations to 3.3 lactations...predicted to be slightly increasing at a herd life of 2,658 days or 7.3 years of age; effectively...
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Breeding for productive cows.(Winter Fair)
; ...most important traits that affect a cows herd life are: Feet & legs, udders, type merit...legs, udders and type merit to long herd life. Culling rates for cows with good feet...combination will result in a shorter herd life. Research carried out by SAC, Edinburgh...
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Optimal Replacement Policy and Economic Value of Dairy Cows with Diverse Health Status and Production Capacity
; ...The present culling age means that the herd life lasts only 2.7 yr and the mean parity...Finland; personal communication). The short herd life leads to high replacement costs and limited...related to it. Because the shortened herd life and its long-term economic consequences...
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Merlin joins Cogent stud.(Farming Life)
; ...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 10 per cent of bulls available in the UK. Coupled with a proof...
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