PERFORMANCES OF SOME HEN BROILERS IN CONDITIONS OF A SLOW GROWING APPLICATION IN EXTENSIVE SYSTEM AND WITH SLAUGHTERING AT DIFFERENT AGES

Carmen Irimia (Gavrilescu), Paula Viorela Druc (Gafencu), Roxana Nicoleta Raţu, Al. Usturoi, M.G. Usturoi

Abstract
   Research was carried out on three meat hen hybrids (one for industrial rearing: Ross-308 and two with slow growing: Hubbard and HB Color), reared in extensive system, in shelters opened to external paddocks. Speaking about growing rhythm, the best results were obtained at Ross-308 chickens (mean gain of 39.11-41.82 g/head/day), higher with 2.05-21.43% than at HB Color and with 1.62-16.14% than at Hubbard, with the mention that at growing series till 56 days Hubbard chickens overcome the Ross-308 ones with 0.5%. The final weight was 2.25-3.28 kg at Ross-308, higher with 0.44-12.19% than at Hubbard and with 2.75-21.64% face to HC Color. The best total fodder consumption was also at Ross-308 (5257-7319 g m.f./period), and the most inconvenient one was at HB Color (5439-7945 g m.f./period). Conversely, Ross-308 chickens had the highest mortality rate (9.04-12.021%), higher with 6.71-8.11% than Hubbard and with 2.69-4.29% than HB Color. Our conclusion was that only Hubbard hybrid realised production parameters close to the ones mentioned in rearing guide, and optimal slaughtering age of chickens with slow growing is 63 days.

Key words: broiler, hen, rearing, extensive, performances