J. Philipsson | Swedish University of Agricultural Sciences (original) (raw)

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Papers by J. Philipsson

Interbull Bulletin, 2005

The use of international genetic evaluations of dairy bulls has become a common practice today in... more The use of international genetic evaluations of dairy bulls has become a common practice today in almost all major dairy producing countries around the world. At this year s Interbull meeting in Uppsala we can celebrate 10 years of international genetic evaluations. Furthermore, it is 30 years since the first working group started to work on the issues that subsequently led to formation of Interbull, and it is 15 years ago that the Interbull Centre was established. So there are many milestones to celebrate at this occasion! As all these developments build on previous achievements it is of interest to have the history of Interbull and international genetic evaluations documented.

AGTR Training Module, 2006

Animal Genetic Resources/Ressources génétiques animales/Recursos genéticos animales, 2011

In Sweden competition results have been made available for research since the beginning of 1960’i... more In Sweden competition results have been made available for research since the beginning of 1960’ies. Until 2002 results for approximately 38,000 horses were available from dressage, show jumping and eventing competitions. Genetic parameters were estimated for results obtained at different stages in life of the horses. The results were divided in three groups. The first group included results up to six years of age, the second up to nine years and the last included all results the horses had until 2002, i.e. lifetime results. A multi-trait animal model was used for estimation of genetic parameters for traits in dressage and show jumping. Heritabilities were higher for show jumping than for dressage and increased with increasing of age of the horses and amount of information. For dressage heritabilities increased from 0.08-0.10 for the youngest group to 0.15-0.16 for the lifetime results. For show jumping the corresponding values increased from 0.110.20 to 0.23-0.38. Genetic correlati...

Charolais at first and later parities Genetic parameters for calving difficulty, stillbirth, and ... more Charolais at first and later parities Genetic parameters for calving difficulty, stillbirth, and birth weight for Hereford and

Interbull Bulletin, 1993

Peer reviewe

Interbull Bulletin, 2011

Effects of animal breeding have historically been boosted at certain times by important technical... more Effects of animal breeding have historically been boosted at certain times by important technical discoveries or theoretical developments. The globalization of cattle breeding has been possible due to the possibility of using frozen semen of individual bulls across the world. Which are the best bulls to be used got a boost by the development of the mixed-model procedures (BLUP) supported by enormously enhanced computer capacity. The development of MACE enabled the opportunity to evaluate practically all AI bulls across countries. And now we are in the midst of a technical break-through where technology developments including sequencing of the cattle genome combined with use of quantitative genetic methods form the basis for genomic selection. During the past 20 years an enormous development has taken place in the major dairy breeds. Interbull has played an important role for this development as facilitator through delivery of genetic evaluations to be used across countries, so that ...

Acta Agriculturae Scandinavica Section A-animal Science, 1998

Livestock are essential for food and nutrition security in sub-Saharan Africa. They serve multipl... more Livestock are essential for food and nutrition security in sub-Saharan Africa. They serve multiple purposes and are economically important, contributing 20–40% of agricultural gross domestic product (GDP) – in some countries, up to 80%. Globally, by 2050, food production of animal origin is expected to double, to meet rising demand due to population growth and increased consumption in developing countries.1

BSAP Occasional Publication, 2001

Female fertility affects the culling rate as well as the direct reproduction costs and influences... more Female fertility affects the culling rate as well as the direct reproduction costs and influences the calving interval and the calving season. It is therefore obvious that female fertility should be included in a Total Merit Index (TMI), which directs the genetic changes in dairy cattle selection. When the first TMI was introduced in Sweden in 1975 female fertility was included. A basic prerequisite for inclusion of fertility in the Scandinavian breeding programme was that milk recording, pedigree and AI-data were integrated in the same databases.The paper deals exclusively with the additive genetic effects on female fertility. The heritabilities of the measures used for female fertility are low, usually below 0.05. Despite this, the additive genetic variance is high as demonstrated by large differences between progeny groups. Thus, selection must be based on progeny testing of bulls on daughter groups of 100-150 daughters or more, which is the case in all the Scandinavian countries...