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Revista Brasileira de Zootecnia

Print version ISSN 1516-3598On-line version ISSN 1806-9290

Abstract

HAESE, Douglas et al. Dietary digestible tryptophan levels for barrows with of high genetic potential for lean deposition in the carcass from 60 to 95 kg. R. Bras. Zootec. [online]. 2006, vol.35, n.6, pp.2309-2313. ISSN 1516-3598.  http://dx.doi.org/10.1590/S1516-35982006000800016.

Seventy commercial hybrid barrows with high genetic potential for lean deposition in the carcass averaging initial and final body weight of 60.0 ± 1.34 kg and 95.0 ± 0.97 kg, respectively, were used to evaluate the effects of dietary digestible tryptophan levels on performance and carcass characteristics. The experiment was analyzed as a randomized experimental block design with five treatments (0.128, 0.136, 0.144, 0.152, and 0.160%) of digestible tryptophan, that is correspondent to the digestible tryptophan:lysine ratios of 16, 17, 18, 19 and 20%, with seven replicates and two animals per experimental unit. No treatment effect on feed intake, weight gain, feed:gain ratio, backfat thickness and lean yield was observed. The digestible tryptophan intake linearly increased as dietary digestible tryptophan levels increased. The 0.128% digestible tryptophan level, that is correspondent to a 16% digestible tryptophan:lysine ratio, met the requirements of barrows with high genetic potential for lean deposition in the carcass from 60 to 95 kg.

Keywords : amino acids; carcass characteristics; finishing; performance.

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