The biological role of omega-3 acids, α-linolenic (ALA, C18:3 n-3), eicosapentaenoic (EPA, C20:5 n-3), docosapentaenoic (DPA, C22:5 n-3) and docosahexaenoic (DHA, C22:6 n-3) in human organism was described. The sources (sea organisms – fish and algae as well as oily plants, mainly linseed) and their possible applications in feeding layer poultry in order to enrich hen yolks with the acids was described. Moreover, the problem of the so called fish-taste and smell as well as the methods of limiting such negative sensory features were discussed.

This research was conducted on 22 red-eared sliders during hibernation and after arousal. The material came from Poznan Zoo (Poland). Species affiliation was established on the basis of the Turtles of the World key. The examined sliders were of a similar age. The histological, histochemical and ultrastructural studies were conducted during hibernation and after arousal. Additionally analysis of liver elemental composition (C, O , Na, Ca, Al, P, Mg and S) was performed. The results showed morphological and ultrastructural liver changes, related to hibernation process concerning shape and size of hepatocytes as well as morphology and location of cell organelles. The conducted elemental analyses revealed during hibernation the reduction of the phosphorus levels up to70–80% while after arousal there was distinct increase of oxygen, sodium and aluminum concentration noticed.

The objective of this study was to compare the efficiency of different estrus induction protocols in anoestrus goat. Does were assigned to seven groups (A-G). In the group A, the animals (n=25 ) received intravaginal sponges containing 30 mg of flugestone acetate FGA (Chronogest, Intervet) for 12 days and i.m. injection of 500 I.U. of PMSG (Folligon, Intervet) two days before sponges withdrawal. In the groups B(n=10), C (n=10), D (n=10) females received 12,5 mg progesterone (Progesteronum, Polfa Warszawa S.A.) per animal in i.m. injections respectively for 6, 12 or 2 days. Females from groups E (n=10) and F (n=10) received altrenogest (Regumate, Intervet) p.o. for 6 or 12 day. At the end of progestagen treatment the animals from group B, C, D, E, F received 500 I.U. of PMSG i.m. The goats from control group G (n=10) did not received any treatment. During the experiment, a significant difference was found in the effectiveness of the oestrus induction among applied methods. Oestrus occurred in 72% of females from group A, 60% from group B, 100% from group C and 20 % of females from group G. Oestrus was not observed in any female of group D, E and F. We concluded that the duration of the progestagen treatment significantly influenced the efficiency of the oestrus induction protocol in anoestrus goats.