The expression can be traced back to horse racing in the 1700s when goats were used to settle the horses. A young goat. An idiom is a turn of phrase that doesn't make sense when literally translated.
Description: GTF file is a General Feature Format File. The Gene transfer format (GTF) is a file format used to hold information about gene structure. It is a tab-delimited text format based on the general feature format (GFF), but contains some additional conventions specific to gene information.
A file with the TIF or TIFF file extension is a Tagged Image file, used for storing high quality raster type graphics. The format supports lossless compression so that graphic artists and photographers can archive their photos to save on disk space without compromising quality. GeoTIFF Image files also use the TIF file extension.