Avaliação de substâncias com propriedades colagogas durante o jejum pré-abate em frangos de corte

Abstract

This study aimed to investigate the effect of soybean oil, boldo leaves essence infusion and a cholesterol absorption-inhibiting substance in the storage of bile in the gallbladder during fasting in Cobb broilers. A total of three trials were run using a completely randomized design. Treatments consisted: T1 control (1,6 mL water); T2 0,4 mL soybean oil; T3 0,8 mL soybean oil; T4 1,2 mL soybean oil; T5 1,6 mL soybean oil (offered by gavage bird/hour). A total of 100 broilers were equally distributed into five treatments (20 birds/treatment). Each bird was taken as a replicate. In the second trial, the infusion of boldo leaves essence efficiency was examined. A total of 76 broilers were equally divided into two groups: with boldo leaves essence (1.6 ml) and without boldo leaves essence (1.6 ml water), offered by gavage. In the third trial, the inclusion of soybean oil was offered in combination with a cholesterol absorption inhibiting substance. A total of 216 broilers were equally distributed into four treatments: T1-control; T2- 1.6 ml soybean oil + cholesterol inhibiting substance; T3- 1.6 ml soybean oil + cholesterol inhibiting substance and T4- cholesterol-inhibiting substance. Carcass weight loss and gallbladder weight were examined. The results indicated that offering increasing levels of soybean oil up to 1.6 ml/hour, during 6 fasting hours does not decrease the gallbladder weight, but alters the bile density and decreases linearly the broiler weight at the slaughtering time. There is a linear decrease in the broilers live weight as the preharvesting fasting period increases up to six hours, regardless of the application of soybean oil or boldo leaves essence infusion. Offering boldo leaves essence (1.6 ml/hour, during 6 hours), during the fasting period does not decrease the gallbladder weight. Soybean oil alone decreases gallbladder weight bring about a reduction one hour following its offering to the birds. The use of cholesterol absorption-inhibiting substance does not reduce the gallbladder weight if offered 4 hours preharvesting.