1. In two experiments, no consistent differences in weight gain or food intake appeared between broiler chickens given diets based on whole or rolled barley, but food: gain ratio and gizzard weight as a percentage of live weight were reduced (P < 0.05) when barley was rolled. Grit addition did not affect performance or intestinal characteristics. 2. In a third experiment, whole barley diets gave significantly higher weight gain than ground barley diets; this was attributable to the significantly higher food consumption. Gizzard weight as a percentage of live weight increased (P < 0.05) when whole barley was fed, while food: gain ratio was not significantly (P > 0.05) affected by the form of barley. 3. The number of particles in the intestinal contents with sizes larger than 2.4 mm was not significantly (P < 0.05) different between broiler chickens fed on whole barley and those fed ground barley, but the number of particles with sizes between 2.4 and 0.7 mm was lower P < 0.05) when diets with whole barley were fed. 4. Enzyme addition increased (P < 0.05) weight gain and the DM of intestinal contents, and decreased (P < 0.05) intestinal viscosity, food: gain ratio and pancreas weight as a percentage of live weight regardless of form of the barley.
Kjos, N. P., Herstad, O., Øverland, M. and Skrede, A. 2000. Effects of dietary fish silage and fish fat on growth performance and meat quality of broiler chicks. Can. J. Anim. Sci. 80: 625-632. Two experiments were conducted to study the effect of concentrated fish silage and additional fish fat on growth performance (exp. 1) and meat quality (exp. 2) of broiler chicks. In exp.1, 600 day-old male and female chicks with an initial weight of 36.3 g ± 0.6 SD were allocated to five treatment groups. The treatments were a control diet, two test diets with 50 g kg -1 fish silage and different levels of fish fat (6 or 8 g kg -1 ), and two diets with 100 g kg -1 fish silage and different levels of fish fat (8 or 10 g kg -1 ). In exp. 2, 150 day-old female chicks with an initial weight of 36.3 g ± 0.7 SD were allocated to five treatment groups. The treatments were a control diet, and one of four test diets containing 50 g kg -1 fish silage and different levels of fish fat (2, 9, 17 or 25 g kg -1 ). In exp. 1, chicks fed diets with fish silage had a greater weight gain (P < 0.001), a greater feed intake (P < 0.05) and a lower feed-to-gain (MJ ME kg -1 ) (P < 0.001) than those fed the control diet. In exp. 2, no significant differences in weight gain or carcass weight were found among diets. The proportions of the fatty acids C18:3, C20:1, C20:5, C22:5 and C22:6 in abdominal fat, and C20:1, C22:1, C22:5 and C22:6 in breast meat, increased by the dietary inclusion of fish silage and fish fat. Increasing levels of dietary fish fat decreased blood plasma levels of vitamin E and ceruloplasmin. The diets containing the highest levels of fish fat (16.8 or 24.8 g kg -1 ) caused off-odour and off-taste of thigh meat stored at -16°C for both six months and one month.
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