| Analysis of the relationship between workability traits and functional longevity in Canadian dairy breeds. | |
| | |
MedLine Citation:
|
PMID: 20723709 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
The aim of this study was to assess the effect of workability traits like milking speed and temperament on functional longevity of Canadian dairy cattle using a Weibull proportional hazards model. First-lactation data consisted of the following: 1,728,289 and 2,426,123 Holstein cows for milking temperament and milking speed, respectively, from 18,401 herds and sired by 8,248 sires; 39,618 and 60,121 Jersey cows for milking temperament and milking speed, respectively, from 1,845 herds and sired by 2,413 sires; and 54,391 and 94,847 Ayrshire cows for milking temperament and milking speed, respectively, from 1,316 herds and sired by 2,779 sires. Functional longevity was defined as the number of days from the first calving to culling, death, or censoring adjusted for production. Milking temperament and milking speed were recorded on a 1- to 5-point scale from very nervous to very calm and from very slow to very fast, respectively. The statistical model included the effects of stage of lactation; season of production; the annual change in herd size; type of milk recording supervision; age at first calving; effects of milk, fat, and protein yields calculated as within herd-year-parity deviations; herd-year-season of calving; sire; and milking temperament or milking speed class. The relative culling rate was calculated for animals in each milking temperament or milking speed class after accounting for the above-mentioned effects. The study showed that there was a statistically significant association between workability traits and functional longevity. Very nervous cows were 26, 23, and 46% more likely to be culled than very calm cows in Holstein, Ayrshire, and Jersey breeds, respectively. Similarly, very slow milkers were 36, 33, and 28% more likely to be culled than average milkers in Holstein, Ayrshire, and Jersey breeds, respectively. Additionally, very fast milkers were 11, 13, and 15% more likely to be culled than average milkers in Holstein, Ayrshire, and Jersey breeds, respectively. Producers might want to avoid consequences associated with the fast milkers such as udder health problems. |
| | |
Authors:
|
A Sewalem; F Miglior; G J Kistemaker |
Related Documents
:
|
9406089 - A statistical evaluation of animal and nutritional factors influencing concentrations o... 15829679 - Effect of heat stress on production of mediterranean dairy sheep. 16989949 - Predicting milk-production responses after an autumn treatment of pastured dairy herds ... 2726319 - Growth of very low birth weight infants on varying amounts of human milk protein. 11242449 - Oligosaccharides and glycoconjugates in bovine milk and colostrum. 8056659 - Genetic parameters for milk production of australian beef cows and weaning weight of th... 8208779 - Interactions between 5-hydroxytryptamine (5-ht) and testosterone in the control of sexu... 17371789 - Oral n-acetyl-l-cysteine is a safe and effective precursor of cysteine. 19172409 - Effect of feeding some west african browse foliages on growth and carcass composition i... |
Publication Detail:
|
Type: Journal Article |
Journal Detail:
|
Title: Journal of dairy science Volume: 93 ISSN: 1525-3198 ISO Abbreviation: J. Dairy Sci. Publication Date: 2010 Sep |
Date Detail:
|
Created Date: 2010-08-20 Completed Date: 2010-11-30 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 2985126R Medline TA: J Dairy Sci Country: United States |
Other Details:
|
Languages: eng Pagination: 4359-65 Citation Subset: IM |
Copyright Information:
|
Copyright (c) 2010 American Dairy Science Association. Published by Elsevier Inc. All rights reserved. |
Affiliation:
|
Guelph Food Research Centre, Agriculture and Agri-Food Canada, Guelph, Ontario, N1G 5C9, Canada. Asheber.Sewalem@agr.gc.ca |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Animals Breeding / methods Canada Cattle / genetics*, physiology Dairying / methods Female Lactation / genetics Longevity / genetics*, physiology Male Milk / secretion Phenotype Quantitative Trait, Heritable* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Comparison of different models for genetic analysis of clinical mastitis in Austrian Fleckvieh dual-...
Next Document: Impact of genetic progress on the profits of dairy farmers.