Search PubMed⌕ Search

Biomedical subjects

P Horst

Publications and source records attributed to P Horst.

7 recordsLinked to original sources
PubMed1990

[The evaluation of fertility characteristics in hens using fluorescence microscopy].

A method for the assessment of fertility in domestic hens is described. Vitelline membranes of fertilized eggs were coloured with fluorochrome DAPI, following which the DNA of sperms on these membranes has been examined with the help of fluorescence microscopy. After insemination with frozen semen there exist significant correlations between the number of sperms on the vitelline membranes on the one hand and 1) fertilization rates; 2) the length of fertile periods. Furthermore, it was observed that with higher numbers of sperms on the membranes, the length of the fertile periods tends to be shorter than with smaller numbers of sperm.

Animals↗
PubMed1983

The concept of "productive adaptability" of domestic animals in tropical and subtropical regions.

The complex trait "productive adaptability" is shown to be a useful parameter for selection work in tropical climates. Characters such as rectal temperature in poultry and hair colour and structure in cattle used as indicators of heat tolerance prove to be of little value. "Productive adaptability" is also genetically more suited for selection procedures. Our results confirm that body size is a significant indicator of an animal's productive adaptability and that it is a suitable criterion for use in improving the genetic potential of livestock in warm climates. The special use of major genes in breeding programmes to improve productive adaptability is demonstrated.

Acclimatization↗