Services on Demand
Journal
Article
Indicators
- Cited by SciELO
- Access statistics
Related links
- Cited by Google
- Similars in SciELO
- Similars in Google
Share
Revista MVZ Córdoba
Print version ISSN 0122-0268On-line version ISSN 1909-0544
Abstract
BORGES-FERREIRA, Cátia et al. Reduction of the crude protein in the diet of creole broilers in a semi-intensive system. Rev.MVZ Cordoba [online]. 2019, vol.24, n.3, pp.7322-7327. Epub June 08, 2020. ISSN 0122-0268. https://doi.org/10.21897/rmvz.1824.
Objective
. To evaluate the reduction of crude protein levels, without altering the ratio of essential amino acids, of free-range chickens, of one at 42 days old.
Materials and methods.
Two trials were performed comprising the initial phase (one to 21 days) and growth (22 to 42 days). A total of 630 chicks of the Redbro line of one day old, were distributed in a completely randomized design with five treatments and six replicates of 21 birds each, totaling 30 experimental units consisting of a shelter area and corrals. The levels reduced of crude protein for the initial phase were: 21.5, 21.0, 20.5, 20.0 and 19.5% and for the growth phase: 19.0, 18.5, 18.0, 17.5 and 17.0%. In all the treatments were maintained the minimum ratio between essential amino acids and lysine. The performance characteristics evaluated were: weight gain, feed intake and feed conversion.
Results.
There was no effect (p>0.05) of the crude protein reduction for any of the variables in all phases, except for feed conversion (p<0.05) that improved with 18.20% in the growth phase.
Conclusions.
Crude protein levels for chickens of the Redbro line, can be reduced to 19.5% and 18.2% for the initial and growth phases, respectively, provided that the ideal amino acid ratios are maintained with digestible lysine and meet the requirements of limiting amino acids.
Keywords : essential amino acids; ideal protein; Label rouge; nutrition. (Source: MeSH, NLM).