| Autor: |
Usturoi, Marius G., Boişteanu, Paul C., Pop, loan M., Doliş, Marius, Radu-Rusu, R. M., Usturoi, Al. |
| Předmět: |
|
| Zdroj: |
Bulletin of the University of Agricultural Sciences & Veterinary Medicine Cluj-Napoca. Animal Science & Biotechnologies; 2009, Vol. 66 Issue 1/2, p212-221, 10p, 13 Charts |
| Abstrakt: |
The researches have been carried on using 2322 "Lohmann Brown" hens, randomly allocated in two groups: Lexp-1 (432 hens reared in coops) and Lexp-2 (1890 hens reared within a hail providing free access to an external paddock). The hens belonging to Lexp-1 group had an average yield of 325.05 eggs, compared to 273.4 eggs, provided by those in the Lexp-2, resulting also different values for the feed conversion ratio (145.34 g/egg, respectively 200.38 g/egg). Despite this, the mortality was 4.3% lower within the fowl reared in the hall with free paddock access, compared with those accommodated in battery coops. The incidence of eggs inappropriate for commercial use was found within normal limits but proved to be higher in Lexp-1, mainly due to the intense laying rhythm that disturbed the common cycle periodicity of egg genesis. Due to the same fact, shell thickness was 0.009-0.015 mm lower in Lexp-1 eggs, comparing with those in the Lexp-2 one, as well as the shell breaking strength (0.321-0.340 kg f/cm² in Lexp-1 as compared to 0.330-0.351 kg f/cm² in Lexp-2). The main conclusion states that the free/range type exploitation of fowl did not consist a viable alternative to the battery coops rearing systems, although it provide the appropriate conditions to fulfill poultry welfare requirements. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
