Solvent-extracted cashew nut meal as a dietary protein source for layer chicks

Abstract

This study aimed to produce a low-fat cashew nut meal (CNM) containing less than 6% fat and assess its effect on layer chick growing performance and health status. The experiment used 225 one-day-old layer ISA Brown chicks with an average live weight of 27.38 ± 1.85 g, divided into 15 batches of 15 animals each. Five diets containing 0, 25, 50, 75, and 100% CNM as a replacement for soybean meal were tested. The test included three replicates of 15 chicks for each diet. The CNM was obtained after oil extraction using an automatic press followed by solvent extraction. The CNM contained 40.6% crude protein and 5.38% fat. Except for the chicks fed on the 100% CNM diet that had the worst growth performance parameters, those on the other diets had an average final live weight of 662.13 g and an average feed conversion ratio of 2.76. The highest average daily gain (15,07g/d) was observed in chicks on the 75% CNM diet. Hematological analyses showed no marked difference between the animal groups. Regarding the blood biochemical profile, the total cholesterol levels were similar in the chicks for all diets. High-density lipoprotein cholesterol levels were 1.4 times higher in the chicks fed on CNM-based diets compared to those fed a soybean meal-based diet. It was concluded that low-fat CNM could replace soybean meal by up to 75% in layer chick feed without negative effects on growth performance and health status.