Acquisition of linograms in SPET: implementation and benefits.

Compared with other tomographic modalities, single-photon emission tomography (SPET), the most widely used tomographic modality in nuclear medicine, suffers from poor quality image since the collimator stops 99.99% of the emitted gamma rays reaching the detector. This paper describes a new SPET acquisition modality using a very short focal length (12.

An observational study into herd-level risk indicators of return to oestrus more than five days after insemination in sow herds.

In a study population of 90 sow herds in the southern Netherlands, the occurrence of sows returning to oestrus more than five days after insemination (SRO) was investigated. In these herds information with regard to the herd system, herd size, and breeding management was recorded. The occurrence of SRO was recorded with the on-farm computer management system CBK-plus.

Return to oestrus after first insemination in sow herds (incidence, seasonality, and association with reproductivity and some blood parameters).

As no systematic study has been done to get an accurate estimate of the incidence of return to oestrus after first insemination in sows in the Netherlands, the objectives of this investigation were: 1) to obtain an estimate of the incidence of return to oestrus after insemination at the herd level; 2) to investigate the association between incidence of return to oestrus after first insemination and reproduction characteristics in order to get an impression of the economic importance of reproductive failure. These objectives were investigated by using the reproduction results of 240 swine breeding herds in the Southern Netherlands in 1987. This information was obtained from CBK plus computerized herd management records.