Digestible Threonine Levels in the Starter Diet of Broilers Derived from Breeders of Different Ages
| Autor: | Michele Laboissière, C. M Mc Manus, Aline Mondini Calil Racanicci, Marcos Barcellos Café, Candice Bergmann Tanure, Eduardo Miranda de Oliveira, Januária Silva Santos, José Henrique Stringhini |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
animal diseases
Nutrição Biology Development Desenvolvimento Starter Nutrient lcsh:Zoology medicine Food science lcsh:QL1-991 Threonine lcsh:SF1-1100 Metabolismo lcsh:Veterinary medicine Maximum level poultry food and beverages Ave doméstica nutrition lcsh:SF600-1100 Animal Science and Zoology lcsh:Animal culture medicine.symptom Weight gain metabolism |
| Zdroj: | Brazilian Journal of Poultry Science v.17 n.spe 2015 Brazilian Journal of Poultry Science Fundação APINCO de Ciência e Tecnologia Avícolas (FACTA) instacron:FACTA Brazilian Journal of Poultry Science, Vol 17, Iss spe, Pp 31-37 (2015) Scopus-Elsevier Revista Brasileira de Ciência Avícola, Volume: 17, Issue: spe, Pages: 31-37, Published: DEC 2015 Repositório Institucional da UnB Universidade de Brasília (UnB) instacron:UNB |
| Popis: | The aim of this study was to evaluate the effect of digestible threonine supplementation in the starter diet on the performance, intestinal parameters, and nutrient metabolism of broilers derived from breeders of different ages. In total, 480 one-day-old Cobb chicks, derived from 38-or 49-week-oldbreeders, were housed in experimental battery cages until 21 days of age and fed four different threonine levels (800, 900, 1,000, or 1,100 mg/kg) in the starter feed. A completely randomized experimental design in a 2x4 factorial arrangement (breeder age x threonine levels) was applied, totaling eight treatments with five replicates of 12 birds each. Broilers from older breeders fed 800 mg digestible threonine/kg of diet presented higher weight gain, with a positive linear effect. There was also an interaction between breeder age and threonine levels for the weight gain of 21-d-old broilers supplemented at maximum level of 1,003 mg Thr/kg diet during the starter phase. There was no effect of breeder age or threonine levels on nutrient metabolism during the period of 17-21 days. There was no influence of breeder age or threonine levels in the starter diet on intestinal morphometric measurements, absorption area, or percentage of goblet cells. |
| Databáze: | OpenAIRE |
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