Performance, intestinal morphometry and incubation parameters of broiler chickens submitted to in ovo feeding with different techniques and amino acids
The objective of this research was to evaluate techniques, incubation period and effects of amino acids in ovo feeding. First, 240 embryonated eggs were selected and distributed in a 2 × 3 factorial arrangement (two techniques and three days). The parameters of incubation, relative weight of gastrointestinal organs and classification of embryonic mortality were evaluated. In the second stage, 720 embryonated eggs were incubated with five treatments: control, methionine (20 and 30 mg) and lysine (20 and 30 mg). These animals were housed during 14 days. The animals remained with five incubation treatments, nine replicates and groupings based on sex. Incubation parameters, performance, intestinal morphometry and relative weight of digestive tract organs were evaluated. The results indicate that the technique using a 45 ° needle axis passing through the air chamber hinders hatchability. In the organ weighing, there was no difference between the evaluated factors. For intestinal morphometry, there was only a significant difference between the dose factor for the crypt villi and crypt diameter. To conclude, the technique 90º angle without passing through the air chamber is safer for the embryos. The inoculation of methionine (20 mg and 30 mg) obtained data similar to the control group.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author
