M.G. Usturoi


IMPROVEMENT OF THE MORPHO-PRODUCTIVE INDEXES AT THE ROSS-308 BROILER BREEDERS, THROUGH INCREASED PHOTOSTIMULATION

M.G. Usturoi, I. Vacaru-Opris, I. Ciocan, R.M. Radu-Rusu A. Usturoi

Abstract
The researches focused on the eggs yield improvement at the „Ross 308” hens breeders, through the optimisation of the lighting schedule. The groups method, mixed with the periods one, was applied. Two groups have been established (Lc and Lexp), comprising each 5260 hens and the required roosters; the fowl have been observed during 20-60 weeks age period. Both groups received the standard phostostimulation schedule, as specified by the producer. However, the Lexp group received 1 supplemental hour of lightning/week and 10 lux higher lighting intensity. The live weight was found within the standard curve in both groups and the hens in the experimental group were 0.15-3.60g heavier than those in the control group. Although the mortality percentage was close between groups (9.85% in Lc and 9.29% in Lexp), the culling generated by prolapses was 0.59% lower in Lexp. Eggs yield reached 183.65 pieces in Lexp compared to just 178.25 pieces in Lc, leading thus to an improved feed conversion ratio, meaning 3.11% better at the experimental group. The main conclusion of the study states that the usage of an increased photostimulation schedule on the “Ross 308” broiler breeders provides an appropriate correlation between the sexual maturity onset and the reaching moment of the optimal live weight, generating thus higher morpho-productive indexes, compared to those achieved within the classical photostimulation version.

Key words: hens, reproduction, photostimulation, production

ÎMBUNATATIREA INDICILOR MORFO-PRODUCTIVI LA PARINTII HIBRIDULUI DE GAINA ROSS-308 PRIN FOTOSTIMULARE ALERTA

M.G. Usturoi, I. Vacaru-Opris, I. Ciocan, R.M. Radu-Rusu A. Usturoi

Rezumat
Cercetarile au vizat sporirea productiei de oua la gainile de reproductie-parinti „Ross 308”, prin optimizarea programului de lumina. S-a lucrat cu metoda grupelor, combinata cu cea a perioadelor, fiind constituite 2 loturi de experienta (Lc si Lexp), a câte 5260 gaini fiecare si cocosii aferenti; pasarile au fost studiate în perioada de vârsta 20-60 saptamâni. La ambele loturi s-a aplicat programul de fotostimulare recomandat de firma producatoare, numai ca lotul experimental a beneficiat de un supliment de 1 ora lumina/saptamâna si o intensitate luminoasa mai mare cu 10 lucsi. Greutatea pasarilor din ambele loturi s-a încadrat în curba standard, cu mentiunea ca cele din lotul experimental au cântarit cu 0,15-3,60g mai mult decât gainile de control. Desi procentul de mortalitate a fost apropiat (7,73% la Lc si 7,66% la Lexp), reformele datorate prolapsurilor au fost cu 0,38% mai mici la Lexp. Productia numerica de oua a fost de 196,92 buc. la Lexp, fata de numai 186,82 buc. la Lc, ceea ce a determinat si un indice de conversie a hranei mai bun cu 3,11% la lotul experimental, comparativ cu cel de control. Concluzia studiului a fost ca aplicarea unui program alert de fotostimulare la parintii hibridului „Ross 308” asigura o buna corelare între momentul instalarii maturitatii sexuale si realizarea greutatii corporale optime, materializata în indicatori morfo-productivi superiori celor asigurati de varianta clasica de fotostimulare.

Cuvinte cheie: gaini, reproductie, fotostimulare, productie