Data/hora: 06/06/2024 04:28:25

Provedor de dados: | 89
País: | Brazil
Título: | Crude Glycerin and Energy Density of Diets for Growing, Pre-Lay and Pre-Peak Backcob Brown Egg-Laying Hens
Autores: | Avellaneda,Y; Ariza-Nieto,C; Afanador-Téllez,G.
Data: | 2020-01-01
Ano: | 2020
Palavras-chave: | Feed intake; Feed conversion; Transitional diets; Egg production.
Resumo: | ABSTRACT A total of 320 13-weeks-old pullets were weighed and randomly allocated to treatments comprised by four levels of crude glycerin (0, 3, 6 or 9%) and two levels of ME (metabolizable energy, difference of 100 kcal/kg) in the diets growing (14 to 17 weeks of age), pre-lay and pre-peak (low: 2750, 2800 and 2750 kcal/kg and high: 2850, 2900 and 2850 kcal/kg, respectively). During the study, body weight was registered until 30 weeks of age, feed intake, egg weight and egg-production for each repetition and for individual hens were measured every week. The information was analyzed through a completely randomized design with a 4x2 factorial arrangement. During the growing phase, hens that received low energy diets consumed more feed (p&lt;0.05), gained less body weight (p&lt;0.05) and recorded lower feed conversion (p&lt;0.05). Besides, a positive linear effect (p&lt;0.05) was observed when including glycerin on feed conversion and weight gain. During the initial egg-laying phase, hens fed low-energy diets consumed more feed (p&lt;0.05) and laid lighter eggs (p&lt;0.05). Furthermore, a positive linear effect (p&lt;0.05) of including crude glycerin on egg yield and feed intake was observed. After the egg-laying peak, the hens of high energy groups consumed 1.6 g/d less feed (p&lt;0.05) and lay 0.9% less eggs, also, it a quadratic effect of inclusion of glycerin on laying-eggs was observed. In conclusion, the use of high energy diets decrease feed intake, increase egg weight until peak, but decrease the percentage of eggs post-peak; glycerin used in diets increases feed intake and improves egg-laying rate in different ways during the laying phase.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2020000200317
Editor: | Fundação APINCO de Ciência e Tecnologia Avícolas
Relação: | 10.1590/1806-9061-2019-1179
Formato: | text/html
Fonte: | Brazilian Journal of Poultry Science  v.22 n.2 2020
Fonte: | info:eu-repo/semantics/openAccess