LEVELS OF CALCIUM AND CALCIUM: PHOSPHORUS RATIO IN DIETS FOR LAIYNG HENS AGED 24 TO 40 WEEKS
| Autor: | Cassia Rampini Vellasco, Paulo Cezar Gomes, Juarez Lopes Donzele, Horacio Santiago Rostagno, Arele Arlindo Calderano, Heloisa Helena de Carvalho Mello, Silvana Marques Pastore |
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| Jazyk: | English<br />Portuguese |
| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Ciência Animal Brasileira, Vol 17, Iss 2, Pp 206-216 (2016) |
| Druh dokumentu: | article |
| ISSN: | 1518-2797 1809-6891 |
| Popis: | Abstract The objective of this study was to determine the nutritional requirement for calcium and the best calcium:phosphorus ratio in the diet for laying hens from 24 to 40 weeks of age. 324 Hy-Line W-36 birds were distributed in a completely randomized design in 3x3 factorial scheme, consisting of three levels of calcium (3.9, 4.2, and 4.5%) and three calcium:phosphorus ratios (9.3, 10.53, and 12.12:1) totaling nine treatments, six replicates and six birds each. We evaluated performance, egg quality, bone characteristics, balance of calcium and phosphorus, and mortality. There was no interaction (P> 0.05) between calcium levels and calcium:phosphorus ratio for the variables, but levels of calcium affected (P |
| Databáze: | Directory of Open Access Journals |
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