On the use of glycerin extract of fish pituitaries on dams' fishes reproduction on northeast of Brazil

Abstract

After several researches upon the use of glycerin extract of  hypophysis from donor fishes in the breeding of Fishes obtained from Northeast Brasil dams, the Authors concludes that:
1st — the extract posology should be: — 0,25; 0,50; 1,00; 1,50; 3,00 hypophysis.
2nd — the extract posology also should be: — 0,25; 0,50; 1,00; 2,00; U,00 hypophysis.
3rd — a greater uniformity in the gonadotropic hormone content in extract it is due to the greater amount of utilized hypophysis.
4th — the use of preserved hypophysis in absolute alcohol it is avoided, which gives a lesser uniformity in the gonadotropic hormone content, as consequence of lesser amount utilized hypophysis.
5th — a eight hours interval between the successive doses is indicated.