Effect of the calcium level and limestone particle size on the performance of semi-heavy layers in the second cycle of egg production
| Autor: | CC Pizzolante, EA Garcia, C Laganá, ESPB Saldanha, AP Deodato, ABG Faitarone, MR Scherer, L Batista |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: | |
| Zdroj: | Brazilian Journal of Poultry Science, Vol 8, Iss 3, Pp 173-176 (2006) |
| Druh dokumentu: | article |
| ISSN: | 1516-635X 1806-9061 |
| DOI: | 10.1590/S1516-635X2006000300006 |
| Popis: | An experiment was carried out at the Research and Development Unit of Brotas aiming at evaluating dietary calcium level and limestone particle size on the production performance of commercial (Hy-Line Brown) layers in the second lay cycle. Experiment duration was 112 days. A total number of 288 hens, with 83 weeks of age in the beginning of the experiment, were used in a completely randomized experimental design in a factorial arrangement of 2x3, with two calcium levels (3.5 and 4.0%) and three limestone particle size compositions: 100% fine limestone (FL), 30% coarse limestone (CL) + 70% fine limestone (FL), and 50% (CL) + 50% (FL), with six replicates of eight birds each. Egg weight (g), egg production (%), egg mass (%), feed intake (g), feed conversion ratio (kg/dz and kg/kg), mortality (%), and egg loss (%) were evaluated. The analysis of variance did not detect significant differences (p>0.05) among treatments on any of the evaluated performance parameters. It was concluded that the tested calcium levels and limestone particle composition did not influence the performance of semi-heavy layers in second production cycle. |
| Databáze: | Directory of Open Access Journals |
| Externí odkaz: |
|