Dissertação
Uso de dietas a base de milho ou sorgo e cantaxantina sobre o desempenho de matrizes de corte e suas progênies
Fecha
2014-06-23Autor
Vivas, Carlos Eduardo Bonilla
Institución
Resumen
An experiment was carried out at Poultry Science Laboratory – LAVIC at the Federal
University of Santa Maria – UFSM. To evaluate the productive and reproductive performance
of broiler breeders fed with corn or sorghum diets supplemented or not with canthaxanthin.
440 females and 60 males Cobb 500 were used and distributed in a completely randomized
design in a factorial arrangement (2x2), with two ingredients; corn (CO) and sorghum (SO),
and two leves of canthaxanthin supplementation, 6mg/kg (CX) and 0mg/kg (NCX), totalizing
4 diets with 5 pens with 22 females and 3 males each one. The experimental period was
splitted in periods, the first from 42 to 53, the second from 54 to 65 wks of age and in a total
period.The offspring performance was evaluated in 2 avaliations from 1 to 21 days. It was
used 320 males chicks of 1 day each one. They came from 54 and 64 wks of age of broiler
breeders. The design was the same used in the broiler breeders study, totalizing 4 treatments
with 10 pens of 8 male each one. The laying rate was affected by the CX supplementation at
the second period. The egg specify gravity was better in egg yolks came from SO+CX and
SO+NCX than CO+CX in the first period, but the egg weight was better in SO+CX than
CO+CX and the same period. At the second period the egg weight was better in CO+NCX
and SO+CX than CO+CX. The fertility and incubation parameters, the eggs were not
influenced by the diets in the total period. CX in diets had the highest deposition of
carotenoids, therefore, the best pigmentation on the egg yolk. The lowest level of the
thiobarbituric acid reactive substances (TBARS) was found in SO+CX. The vitelline
membrane strength registered an incremented to break it in egg yolks came from SO. CO had
the best lutein and zeaxanthin concentrations, but no to CX in the egg yolk. The
concentrations of saturated and monounsaturated fatty acids were the highest in CO diets, but,
polyunsaturated fatty acids were the best in SO diets. The supplementation of CX in diets
reduced mortality offspring at 64 wks of age. The supplementation of canthaxanthin in diet
and the use of sorghum in the poultry feed represents a great opportunity for next researches.