Abstract
This study was carried out to evaluate the effect of the inclusion of different linseed oil levels (0.0, 3.3, 6.6, or 9.9%) in iso-energy diets fed during the period of 21 to 56 days of age on the performance, carcass traits, and body composition of broilers. A total of 1,600 broilers were distributed according to a completely randomized experimental design consisting of four treatments with eight replicates of 40 birds per experimental unit. In the period of 21-42 days of age, weight gain increased, feed and calorie conversion ratios quadratically improved, and feed and metabolizable energy intakes linearly increased as dietary linseed oil level increased. Considering the entire experimental period, dietary linseed oil linearly increased weight gain and feed and energy intakes, and feed and calorie conversion ratios in a quadratic manner. On days 42 and 56, abdominal fat percentage and carcass yield were quadratically influenced by dietary linseed oil. Total body fat content at 56 days of age was quadratically influenced by dietary linseed levels.
Highlights
Dietary fat addition enhances broilers performance in terms of feed intake (López-Ferrer et al, 2001a), weight gain (Ajuyah et al, 1991; Rodríguez et al, 2005), and feed conversion ratio (Dvorin et al, 1998)
This study was carried out to evaluate the effects of the inclusion of different linseed oil levels in iso-energy diets fed during the period of 21 to 56 days of age on the performance, carcass traits, and body composition of broilers
Linseed inclusion level had a quadratic influence (p
Summary
Dietary fat addition enhances broilers performance in terms of feed intake (López-Ferrer et al, 2001a), weight gain (Ajuyah et al, 1991; Rodríguez et al, 2005), and feed conversion ratio (Dvorin et al, 1998). Fat enhances feed palatability and reduces dust (Lara et al, 2005). Modern fast-growing broiler strains have high energy requirements, making oil addition to the diet almost mandatory due to its high energy concentration (Furlan & Macari, 2002). Oils with high levels of polyunsaturated fatty acids (PUFA) are absorbed easier than those containing saturated fatty acids, and have higher energy value and may promote better broiler performance (Dvorin et al, 1998). Oils added to the feeds supply essential fatty acids (Junqueira et al, 2005)
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