RESEARCHES ON EARLY EMBRYOGENESIS FROM TRANSYLVANIAN NAKED NECK AND PLYMOUTH ROCK HEN BREEDS

D. Dronca, N. Pacala, I. Bencsik, T. Oroian, Mihaela Ivancia, Gabi Dumitrescu, S. Voia, Liliana Boca

Abstract
In Romania, the Transylvanian Naked Neck hen breed is considered to be an "endangered" population, reason for which we consider that a special attention should have been given until now. Plymouth Rock breed was imported for the first time to Romania from the Studler Company, France in 1969. This paper is aiming to perform a profound analysis of the development patterns of the neural tube in the two breeds, by measurements carried out at 30, 40, 50, and 60 hours of incubation. Observations show that the closure of the neural canal and its transformation into a tube follows an undulatory pattern, of which positive and negative curls are diametrically opposed in the two breeds, while the development speed during the whole studied period have a relative similar value between the two breeds. We estimate that the two breeds have a good combinative capacity, which recommend the utilization of these genetic materials to obtain hybrids for producing "peasant-type" chicken meat, very well-appreciated by the Europeans between the two World Wars.

Key words: embryos, Transylvanian Naked Neck, Plymouth Rock

CERCETARI PRIVIND EMBRIOGENEZA TIMPURIE LA RASELE DE GAINI GÂT GOLAS DE TRANSILVANIA SI PLYMOUTH ROCK

D. Dronca, N. Pacala, I. Bencsik, T. Oroian, Mihaela Ivancia, Gabi Dumitrescu, S. Voia, Liliana Boca

Rezumat
În România rasa de gaini Gât golas de Transilvania este considerata ca fiind o populatie "în pericol", motiv pentru care consideram ca trebuie sa i se acorde o atentie speciala. Rasa Plymouth Rock a fost importata pentru prima data în anul 1969 de la firma Studler-Franta. Prezenta lucrare îsi propune o analiza aprofundata a modelelor de dezvoltare a tubului neural la cele doua rase, prin masuratori efectuate la vârstele de 30; 40; 50 si 60 ore de incubatie. Observatiile facute demonstreaza ca închiderea canalului neural si transformarea sa în tub se realizeaza dupa un model ondulatoriu a carui bucle pozitive si negative sunt diametrul opuse la cele doua rase, în schimb viteza de dezvoltare pe întreaga perioada studiata are o valoare apropiata. Estimam ca cele doua rase poseda o buna capacitate combinativa speciala ceea ce recomanda utilizarea acestor materiale genetice pentru obtinerea unor hibrizi destinati producerii carnii de pasare de "tip taranesc", foarte apreciata de altfel de catre europeni în perioada interbelica.

Cuvinte cheie: embrioni, Gât golas de Transilvania, Plymouth Rock