Influência da treonina sobre o desempenho e a morfometria intestinal de frangos de corte submetidos a estresse por calor de 1 a 15 dias de idade

The trial was conducted to evaluate the effect of threonine on performance and intestinal mucosa development of 15-day-old broilers submitted to chronic heat stress. It was used 116 broiler chicks. The birds were distributed in a completely randomized design according to a 2X2 factorial, considering two rearing temperatures (thermoneutral and heat stress) and two threonine levels (basal and high). Diets were formulated according to nutritional requirements considering basal and high threonine levels in the pre-initial (0.857% and 0.956%) and initial phases (0.764% and 0.852%, respectively). At 15 days of age, all birds were weighed and four birds per treatment were randomly chosen. They were slaughtered and the small intestine segments were sampled for histomorphometry analyses. It was evaluated villus height, crypt depth and villus:crypt ratio. Final weight and morphometry results were submitted to ANOVA and means were compared by Tukey’s test at 5% of probability. Weight gain, feed intake and feed conversion were submitted to descriptive analyses using Microsoft Excel. There was no interaction between the two factors for final weight. Heat stressed birds had lower final body weight. The high threonine level positively affected weight gain and feed conversion in stresse birds and feed intake was smaller in the same group of birds. There was interaction between the two factors for all parameters, except crypt depth and villus:crypt ratio in the duodenum. Higher villi were observed in the duodenum of birds fed the basal diet in thermoneutral environment. In the jejunum, villi were higher in birds fed high threonine in thermoneutrality. In the ileum, higher villi were observed in birds fed high threonine levels under heat stress. Chronic heat stress affected negatively performance and morphometry of broilers at 15 days of age. High dietary threonine levels positively affected performance of heat-stressed birds, but had no consistent effects on the morphometry of the different intestinal segments.

Grantor

Zootecnia

Year dc:date.issued

2014

Author dc:creator

• Andrade, Maria de Fátima de Souza

• Avicultura
• Frango de corte
• Aclimação animal
• Dieta animal

Statement dc:rights

• Acesso aberto

Language dc:language.iso

pt

Repository record dc:identifier.uri

https://repositorio.ufpb.br/jspui/handle/123456789/583

OAI identifier oai:identifier

oai:repositorio.ufpb.br:123456789/583