Níveis de lisina em rações para fêmeas suínas dos 15 aos 95 kg

• Autor(a) principal: Rossoni, Mariana Cruz
• Data de Publicação: 2007
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/1912
• topic: Lisina; Carboidratos; Microbiota; Lysine; Carbohydrates; Microbiota; CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL

In order to determine the levels of digestible lysine in diets of gilts with high genetic potential for lean deposition, from 15 to 95 kg of weight, three experiments were conducted. On experiment I, 50 commercial breed gilts, from 15 to 30 kg, were distributed in a randomized block design, with five treatments (0.88, 0.98, 1.08, 1.18 and 1.28% of digestible lysine), six replicates and two animals per experimental unit. Treatments influenced, in a quadratic way, feed conversion, and linearly lysine intake, whereas daily weight gain and feed intake was not affected. It was concluded that the level of 1.08% of digestible lysine, which corresponded to a digestible lysine intake of 11.60 g/day, provided the best performance results for gilts the high genetic potential for lean deposition from 15 to 30 kg. On experiment II, 50 commercial breed gilts, from 30 to 60 kg, were distributed in a randomized block design, with five treatments (0.83, 0.93, 1.03, 1.13 and 1.23% of digestible lysine), six replicates and two animals per experimental unit. Levels of lysine had an influence on feed conversion and lysine intake, respectively, in a quadratic and linear way, but had no influence on daily weight gain and feed intake. In matter of carcass traits, a linear effect was observed on lysine levels upon daily protein deposition rate. No effect was observed on daily fat deposition rate. It was concluded that the level of 1.11% of digestible lysine, which corresponded to a digestible lysine intake of 23.62 g/day, provided the best performance results for gilts the high genetic potential for lean deposition from 30 to 60 kg, whereas the level of 1.09% of digestible lysine, which corresponded to a lysine intake of 23.22 g/day, provided the best results for carcass traits. On experiment III, 70 commercial breed gilts, from 30 to 60 kg, were distributed in a randomized block design, with five treatments (0.73, 0.83, 0.93, 1.03 and 1.13% of digestible lysine), seven replicates and two animals per experimental unit. There was no effect of levels of digestible lysine upon feed intake and daily weight gain. A quadratic effect was observed on feed conversion and a linear effect on lysine intake. In matter of carcass traits, a linear effect was observed on lysine levels upon loin eye area, and no effect was observed on backfat thickness. It was concluded that the level of 0.99% of digestible lysine, which corresponded to a digestible lysine intake of 24,67 g/day, provided the best performance, whereas the level of 0.93% of digestible lysine, which corresponded to a lysine intake of 23.22 g/day, provided the best results for carcass traits for gilts the high genetic potential for lean deposition from 60 to 95 kg. The levels of digestible lysine that provided best results for gilts the high genetic potential foe lean deposition were, 1,08% for animals from 15 to 30 kg; 1.11 and 1.09% for, respectively, performance and carcass traits of animals from 30 to 60 kg; and 0.99 and 0.93%, respectively, for performance and carcass traits of animals from 60 to 95 kg.