Effects of dietary fish silage and fish fat on growth performance and meat quality of broiler chicks

Abstract

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.

Effects of dietary fish silage and fish fat on performance and egg quality of laying hens

“…Kjos et al (2000) observed a greater response of fish fat on fatty acid composition in broiler meat than that observed for eggs in the present study when corresponding diets were fed to broiler chicks. Also Krogdahl (1985) has suggested that fatty acid composition of meat changes more readily than that of eggs.…”

“…Kjos et al (2000) showed that fish silage could successfully be fed as a part of compound feed for broiler chicks. Limited information exists on the use of fish silage for laying hens.…”

Effect of dietary incorporation of fish silage on growth performance, serum biochemical parameters and carcass characteristics of broiler chicken

“…2 Usually, these by-products are discarded as waste that causes serious environmental problems and economic losses (Kjos et al, 2000 andBarroga et al,2001).It is estimated that fish waste production is between 17.9 and 39.5 million tonnes per year, representing an important loss of valuable nutrients. Fish waste can be transformed into fish-meal.…”

Avaliação microbiológica e bromatológica da silagem ácida obtida de resíduos da indústria de filetagem de tilápia do Nilo (Oreochromis niloticus)

“…Além disso, apresenta a vantagem de não haver a necessidade de neutralização antes da sua utilização no preparo de rações para alimentação animal. Dong et al (1993), Kjos et al (2000); Lien e Ly (2001) Figura 1. pH da silagem ácida de resíduos da indústria de filetagem de tilápias estocadas por diferentes períodos.…”

“…Dong et al (1993), Kjos et al (2000); Lien e Ly (2001) também não relataram a presença de microorganismos em silagem, demonstrando que outras formas podem ser utilizadas com eficiência na prevenção de microorganismos mantendo a qualidade do produto final. Ucci (2003) observou que para se neutralizar silagens com pH abaixo de 3 é necessário quantidades de cal superior a 5%.…”