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Unformatted text preview: 2010 Poultry Science 89 :1424–1439 doi: 10.3382/ps.2009-00626 Key words: amino acid , broiler , feed restriction , mortality , small intestine ABSTRACT This study investigated the effect of 2 dif- ferent dietary amino acid treatments and feed restriction in early life versus a control treatment on development of the small intestine segments (weights), mortality, and broiler performance. Each treatment was applied to 6 cages with Ross 308 male broilers and to 6 cages with Cobb 500 male broilers with 24 birds per cage. A control treatment (100% ideal protein) was compared with a treatment with 30% extra ideal protein, a treat- ment with daily adjustment of the dietary amino acid level and profile, and a feed restriction treatment. The protein treatments were applied from 0 to 14 d of age. The feed restriction was applied from 4 to 21 d of age. Restriction was 15% from d 4 to 14 of age and dimin- ished with equal daily steps thereafter to 5% at 21 d of age. Birds were weighed and dissected for evaluation of small intestine weights at 6, 9, 14, and 36 d of age. Feed intake restriction reduced leg problems in Ross and Cobb broilers. Extra dietary protein reduced leg problems in Ross broilers only. The present experiment does not show that small intestinal weight development is related to mortality. Thirty percent extra dietary ide- al protein increased duodenum weight between 6 and 9 d of age. This was not further increased by the daily optimization of the dietary amino acid level and profile. The increased duodenum weights coincided with an im- proved BW gain. This indicates that duodenum weight may be important in facilitating BW gain in young broilers. Thus, it may be worthwhile to pay more atten- tion to the relation between nutrition and duodenum weight and duodenum function in further studies. Dietary amino acid levels and feed restriction affect small intestinal development, mortality, and weight gain of male broilers P. J. A. Wijtten ,* 1 E. Hangoor ,* J. K. W. M. Sparla ,* and M. W. A. Verstegen † * Provimi B.V., 3072 AN Rotterdam, the Netherlands; and † Animal Nutrition Group, Wageningen University, 6709 PG Wageningen, the Netherlands INTRODUCTION The growth rate of broilers has increased consider- ably over the last decades. As a side effect, broilers have become more susceptible to metabolic disorders than in the past (Moghadam et al., 2001; Deeb et al., 2002; Julian, 2005). Baghbanzadeh and Decuypere (2008) stressed that particularly growth reduction of broilers in early life is very effective in reducing meta- bolic disorders. It has been suggested that early em- bryonic (Schmalhausen, 1930) or posthatch (Ricklefs, 1987) organ development is important for growth and for organ functioning. From this, we hypothesized that the basis for metabolic disorders lies in early life when relative growth rate is at its maximum. The develop- ment of the small intestines in birds occurs rapidly....
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