Fat-soluble vitamin supplementation levels in diets for laying hens from 28 to 44 weeks of age.
2020
FÉLIX, D. O. | SILVA, A. S. | FIALHO, A. T. S. | OLIVEIRA, C. J. P | BRITO, C. O. | TAVERNARI, F. de C. | RIBEIRO JUNIOR, V. | ROSTAGNO, H. S. | ALBINO, L. F. T. | UFV; UFS; UFS; UFS; CLAUDSON OLIVEIRA BRITO, UFS; FERNANDO DE CASTRO TAVERNARI, CNPSA; VALDIR RIBEIRO JUNIOR, UFS; HORÁCIO SANTIAGO ROSTAGNO, UFV; LUIZ FERNANDO TEIXEIRA ALBINO, UFV.
Abstratc: This study aimed to examine the impact of levels of dietary supplementation with fat-soluble vitamins on the production performance and egg quality of laying hens. Three hundred Hy-Line White W-36 laying hens were evaluated from 28 to 44 weeks of age. The birds were allotted to one of six treatments in a randomized block design with 10 replicates with five birds each. Performance and egg quality parameters were evaluated in four 28-day periods. A corn and soybean meal-based basal diet was formulated so as to meet the nutritional requirements of the animals, with the exception of fatsoluble vitamins. The treatments consisted of dietary supplementation with 0%, 33.3%, 66.7%, 100.0%, 133.3% or 166.7% of fat-soluble vitamins (100% supplementation consisted of 7500 IU, 2000 IU, 10 IU and 1.8 mg of vitamins A, D3, E and K per kilogram of diet, respectively). Eggshell weight, shell thickness, shell strength, feed intake, egg weight, feed conversion per egg mass and feed conversion per dozen eggs showed a quadratic response (p≤0.05) to the treatments, whereas egg mass responded linearly. Optimal results were obtained at an average fat-soluble vitamin supplementation level of 109%, which corresponds to 8175 IU of vitamin A, 2180 IU of vitamin D3, 10.9 IU of vitamin E and 1.96 mg of vitamin K per kilogram of diet.
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