Abstract
The study was conducted to evaluate the effect of early feed restriction on growth, fat accumulation and meat composition in unsexed broiler chickens. In experiment 1, three hundred and fifty one-day-old broiler chicks were divided into 7 groups. Each treatment group was represented by five replicates of ten broilers each. One group was fed ad libitum as the control group and the other six groups were fed 25% ad libitum (25% multiplied by amount of feed intake of ad libitum chicks at the previous day) for 4 or 6 days, 50% ad libitum for 4 or 6 days, and 75% ad libitum for 4 or 6 days. In experiment 2, five hundred broiler chicks were divided into 10 groups. Each treatment group was represented by five replicates of ten broilers each. One group was fed ad libitum as the control group. Three initial age at which broilers were restricted (2, 4 or 6 days of age) and three type of feed restriction (physical restriction, meal feeding and diet dilution) (3×3) were examined. They were restricted feeding for 6 days. Experimental results showed that broilers fed 25% ad libitum for 4-6 days tended to reduce leg meat fat with lower abdominal fat (p<0.05) (experiment 1). Breast meat fat was significantly higher in restricted broilers (p<0.01). Plasma triglyceride was higher in broilers fed 75% ad libitum for 4-6 days. In experiment 2, abdominal fat was lower in restricted broilers (p<0.05). Breast meat fat was significantly higher (p<0.01), whereas leg meat fat was significantly lower (p<0.05) in restricted broilers. Plasma triglyceride was significantly higher in physical feed restriction for 4 days, meal feeding for 4 days and diet dilution for 6 days (p<0.05). In conclusion, to reduce fat accumulation in abdomen and leg meat, broilers should be fed 25% ad libitum for 6 days started at 4 days, or subjected to meal feeding (6 hours per day for 6 days) started at 6 days. (Asian-Aust. J. Anim. Sci. 2002. Vol 15, No. 10 : 1475-1481)
Highlights
In comparion with the control group, fat content of breast meat was significantly higher in broilers fed 25% ad libitum for
The present study shows that unsexed broilers had positive responses to early feed restriciton as indicated by lower abdominal fat and lower fat content of leg meat (Experiment 2)
From these results it could be justified that unsexed broilers responded to early feed restriction as well as sexed broilers
Summary
Many investigators have shown that early feed restriction could reduce fat accumulation in the abdomen (Plavnik and Hurwitz, 1985, 1988, 1989; Santoso et al., 1993a,b, 1995a,b; Santoso, 2001a), in carcass and plasma (Santoso et al, 1993a,b, 1995a,b; Santoso, 2001a,b,c, 2002a,b), and in meat (Santoso, 2001a). Rosebrough et al (1986) found that the reduction of fat accumulation might partly be explained by reduction of hepatic lipogenesis. It was known that broilers reared on-floor had different responses to nutritional planes as compared with those reared in cages (Anderson and Adams, 1994), and they contained different fat accumulation (Santoso, unpublished results). It is possible that different rearing (cages vs floor) may result in different responses to
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