Reznik S.Ya., Vojnovich N.D., Umarova T.Ya.
Morphology of surface and aeropylar area in tachinid eggs from tribes Exoristini and Winthemiini has been investigated using a method of scanning electron microscopy. A key for eggs of seven genera has been prepared. Macrotypic eggs of Exoristini and Winthemiini have a plastron surface represented by a polygonal network, papillar hills, pits and openings of different size and form. Eggs of Exoristini have a hatching line: operculum (Parasetige-na B.B., Phorocera R.-D.), belt (Exorista Mg.), cover (Bessa R.-D., Phorinia R.-D.). Macrotypic eggs of Bessa, Exorista, Parasetigena, Phorocera have two aeropillar structures on the egg poles. Eggs of Winthemiini (Winthernia R.-D., Nemorilla Rd.) have the polygonal network and plastron pits, openings on the dorsal surface. The aeropylar area of Winthemia, disposed on the anterior egg pole and represented by a belt from cripts, forms the hatching line. Nemorilla eggs have two aeropylar zones on lateral sides on the anterior egg pole.
Abaturov B.D., Kuznetsov G.I., Magomedov M.R.D., Petelin D.A.
The nutritional parameters of wild ungulates at grassland were estimated in dry season (November-December 1991) by indirect methods. The digestibility of food in zebra, Grant's gazelle, Swayne's hartebeest and hippopotamus was determined by the technique of lignin tracer. The daily intake of food was calculated basing on the amount of daily cgested feces. Zebra and hartebeest used mainly dry parts of grasses, the content of proteins in their ration did not exceed 5%. Grant's gazelle consumed only green parts of plants, and their ration contained more than 18** of proteins. The digestibility of dry matter in non-ruminants (zebra and hippopotamus) was low (40 to 45%К in hartebeest it was higher (50%), in gazelle - up to 60%. The abundance of dry grasses leads to the high daily food intake in zebra (7.2 kg/ind). Gazelles consumed 1.5 to 2.5 kg/ind, that was normal. The high selectivity of feeding in gazelles and the high areas of burnt pastures with green after-grass in dry season provided these animals with sufficient amount of highquality food and positive energy of protein balances. The high abundance and availability of dry grasses enabled zebras to retain positive energy balance in dry season, but did not supply them with sufficient amount of proteins and caused acute nitrogenous deficiency.
RYAZANOVA G.I., MAZOKHIN-PORSHNYAKOV G.A.
GROMOV V.S., TCHABOVSKY A.V., PARAMONOV D.V., PAVLOV A.P.