Linked Life Data

20217229

Source:http://linkedlifedata.com/resource/pubmed/id/20217229

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2010-7-12
pubmed:abstractText
Age at first parturition (AFP) is an important reproductive trait when evaluating the herd productivity in tropical small-holder farming systems, particularly for small ruminants with high demographic turnover and commercial utilization. The article reports the AFP probability distributions calculated on goats and sheep herds monitored for more than 10 years in three low-input livestock farming systems located from northern to southern Senegal (Louga, Kaymor, and Kolda) and representing different agroecological conditions and animal phenotypes. The AFP distributions were estimated with the Kaplan-Meier (KM) survival analysis accounting for censoring (females lost to follow-up before their first parturition). When measured by the KM estimator of the AFP median, the precocity for both species was almost 4 months later in Louga than in Kaymor and Kolda. In Louga, the precocity was 1.6 months later for sheep than for goats and 2.9 months in Kaymor and Kolda. These estimates were higher than those obtained with the common and crude approach that removes censored data before calculation (relative bias ranged from -12% to -22% for the AFP mean depending on species and site) and those already published in previous studies on the same data sets. In on-farm small ruminant studies focusing on reproductive traits such as AFP distributions, we recommend using survival models (e.g., the KM method) to avoid potential biases due to data censoring.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
1573-7438
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
42
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1155-9
pubmed:meshHeading
pubmed:year
2010
pubmed:articleTitle
Assessment of age at first parturition by accounting censored data: the example of small ruminants in agropastoral herds in Senegal.
pubmed:affiliation
UMR SELMET, CIRAD, Campus International de Baillarguet, 34398, Montpellier Cedex 5, France. matthieu.lesnoff@cirad.fr
pubmed:publicationType
Journal Article