Avaliação de níveis de lisina e planos de nutrição para fêmeas suínas dos 60 aos 148 dias

• Autor(a) principal: Silva Júnior, Veredino Louzada da
• Data de Publicação: 2012
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/1792
• topic: Aminoácidos; Suínos; Sexo; Desempenho; Amino Acids; Pigs; Sex; Performance; CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL

Three experiments were conducted with the objective of evaluating the levels of digestible lysine (Ld) and nutrition plans for of gilts of high genetic potential for muscle protein deposition of 23 to 107 kg of weight. In experiment I, 80 gilts with initial and final weight of 23.66 ± 0.28 kg and 56.98 ± 0.88 kg, respectively, were utilized. The experimental diets were constituted of a basal diet of 19.00% of crude protein and 3,250 kcal of EM/kg and other four diets obtained by the supplementation of the basal diet with Llysine HCl, replacing starch, resulting into experimental diets with levels of 0.90; 1.00; 1.10; 1.20 and 1.30% of Ld. In experiment II, 80 gilts with initial and final weights of 23.34 ± 0.19 kg and 87.39 ± 1.38 kg, respectively, which consumed, in each phase, a basal diet and other four diets obtained by the supplementation of the basal diet with L-Lysine HCl 78%, replacing starch, resulting into nutritional plans with 0.90-0.80; 1.00-0.90; 1.10-1.00; 1.2-1.10 and 1.30-1.20% of Ld, respectively, from 60 to 99 and from 100 to 129 days. In experiment III, 80 gilts with initial and final weights of 23.46 ± 0.27 kg and 106.76 ± 1.99 kg respectively, were used, which consumed in each phase in each phase, a basal diet and other four diets obtained by the supplementation of the basal diet with L-lysine HCl 78%, in the place of starch, resulting into nutritional plans with 0.90-0.80-0.70, 1.00-0.90-0.80, 1.10-1.00-0.90, 1.20- 1.10-1.00 and 1.30-1.20-1.10% of Ld, respectively, from 60 to 99, from 100 to 129 days and 130 to 148 days. In Experiment I, the levels of Ld affected the daily feed intake (CRD) of the animals, which decreased in a quadratic way, up to the level estimated of 1.09% of Ld. The daily intake of Ld increased (P<0,01) in a linear way owing to the rise of the level of Ld in the diet. It was found that no effect of the levels of Ld upon the animals daily weight gain (GPD) was observed, however, effect of the levels of Ld on feed conversion (CA) occurred, which improved in a quadratic way up to the estimated level of 1.10% of Ld. As to the carcass traits, no effect of the levels of Ld upon the loin eye area (AOL) and backfat thickness (ET) was found. The level of 1.10% of Ld corresponding to estimated daily average intake of 18.98g and to a ratio of 3.38g of Ld/Mcal of ME, provided the best result of CA for gilts of high genetic potential for meat deposition from the period of 60 to 99 days of age. In experiment II, no effect (P>0.05) of the nutrition plants either on CRD or on GPD (P<0.05) was observed. No effect (P>0.05) of the nutrition plans upon GPD was found. CA was influenced (P<0.01) by the nutrition plans evaluated and the best response was obtained from the nutrition plan constituted by the sequence of 1.00-0.90% of Ld. No effect (P>0.05) of the nutrition plan was observed either on AOL or on the animals Et. The nutrition plan constituted by the sequence of 1.00-0.90% of digestible lysine meets the Ld requirements of gilts of high genetic potential, respectively, from 60 to 99 and from 100 to 129 days for best response of CA from 60 to 129 days of age. In experiment III, the nutrition plans of Ld did not influence either (P>0.05) the gilts CRD nor their GPD. No effect (P>0.05) was found in the nutrition plans upon the gilts GPD. No effect (P>0.05) of the nutritional plans on the CA, upon hot carcass yield, neither on the amount and yield of meat of the animals was observed. As regards the carcass traits, no effect (P>0.06) of the nutrition plans of Ld on the hot carcass yield of the animals was found. The nutrition plans did not influence (P> 0.05) the amount of meat and yield. The nutrition plan made up of the sequence 0.90-0.80-0.70% of Ld meets the requirements of gilts of high genetic potential, respectively, from 60 to 99, 100 to 129 and from 130 to 148 days for best performance and carcass trait response.