Banca de DEFESA: ANDRÉA SILVA MARQUES DE SOUZA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ANDRÉA SILVA MARQUES DE SOUZA
DATE: 29/02/2024
TIME: 14:00
LOCAL: Sala de seminários da Pós-Graduação - Departamento de Zootecnia
TITLE:

Estimation of the ideal intake of copper complexed with amino acids for commercial laying hens in the rearing phase

KEY WORDS:

microminerals, organic mineral, supplementation, bioavailability

PAGES: 54
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUBÁREA: Nutrição e Alimentação Animal
SPECIALTY: Exigências Nutricionais dos Animais
SUMMARY:

The objective was to estimate the ideal copper intake in the form of amino acid metal for laying birds in the rearing phase. A total of 288 Dekalb White pullets aged 6 weeks to 16 weeks were used. The birds were distributed in a completely randomized design into 6 treatments with 6 replications of 8 birds each. The treatments consisted of supplementation levels of copper complexed with amino acids (CuAA) in the diet (0, 1.5, 3.0, 4.5, 6.0 and 7.5 mg/kg). Performance variables (body weight, weight gain, feed consumption, feed conversion and uniformity) were evaluated, in addition to bone parameters (bone resistance, Seedor index, bone densitometry, tibial weight and length), organ biometrics ( weight of the liver, pancreas, bursa of Fabrício, thymus, spleen, intestine and length of the cecum and intestine) and biochemical analysis (alanine aminotransferase, aspartate aminotransferase, alkaline phosphatase, gammaglutamyltransferase, uric acid, creatine, glucose, total protein, and albumin). The data obtained were subjected to analysis of variance and, in case of significant differences, they were subjected to linear and non-linear models. A significant effect (P < 0.0001) of CuAA supplementation levels on weight gain and uniformity of birds in the period from 6 to 10 weeks was observed, and for performance variables in the interval from 11 to 16 weeks, it had an effect on feed conversion and uniformity. Regarding bone variables, there was an interaction effect only for bone densitometry (P < 0.0001). Regarding organs, a significant difference was observed only for the thymus (P < 0.0001). Regarding blood variables, a significant effect (P < 0.0001) was observed for alanine aminotransferase (U/L), aspartate aminotransferase (U/L), phosphatase alkaline (U/L), gamma glutamyltransferase (U/L), uric acid (mg/dl), creatine (mg/dl), glucose (mg/dl) and total protein (g/dl). The results of the present study indicate that the ideal copper intake for maximum bone development of layers in the rearing phase fed with copper complexed with amino acids is 0.327 mg/bird/day, equivalent to 6.15 mg/kg of supplementation.

COMMITTEE MEMBERS:
Presidente - LILIAN FRANCISCO ARANTES DE SOUZA
Interna - MARIA DO CARMO MOHAUPT MARQUES LUDKE
Externa à Instituição - CLAUDIA DA COSTA LOPES - UFRN