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|Title: ||Productive performance of broilers at the final stage of breeding submitted to different levels of metabolizable energy in different thermal environments|
|Authors: ||Oliveira, K.|
Fitas da Cruz, V.
|Issue Date: ||2018|
|Citation: ||Oliveira K.P., Ferreira C.F.S., Tinoco I.F.F., Andrade R.R., Barbari M.,
Cruz V.M.F., Baptista F.J., Vieira M.F.A., Conti L. and Rossi G. 2018. Productive performance of broilers at the final stage of breeding submitted to different levels of metabolizable energy in different thermal environments. Agronomy Research 16(2), 556-563. https://doi.org/10.15159/AR.18.069|
|Abstract: ||The Brazilian poultry industry is an activity in constant development due to the high
indices of productive efficiency. The accelerated evolution of poultry production has allowed to
obtain early and very efficient broilers able to convert different foods into animal protein.
However, due to this intensive breeding system, a series of metabolic and management problems
appeared, with emphasis on thermal stress. The objective of this work was to evaluate the
physiological responses of broiler chickens in the final stage of breeding (21 to 42 days of life),
submitted to two thermal conditions, one representative of the thermoneutrality situation (T1) and
one giving a situation of cyclic stress by heat (T2). For each experimental thermal condition, the
birds were submitted to different levels of metabolizable energy of 3,050, 3,125, 3,200,
3,275 kcal kg-1. At 28, 35 and 42 days, the birds and the feed leftovers were weighed to measure
the performance variables: CR (feed intake), GP (weight gain) and CA (feed conversion),
viability of the rearing (Vb), productive efficiency index (PEI).
As conclusions, the GP was 13.6% higher for the birds maintained at the thermoneutrality
situation T1. The PEI was 32.5% higher for the birds maintained in T1 condition, when compared
to those kept in T2. However, both in thermoneutral and in heat stress conditions, the increase in
the level of metabolizable energy in the diet did not influence the performance and the productive
efficiency index of broiler chickens aged between 21 and 42 days of age.|
|Appears in Collections:||MED - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica|
ERU - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
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