Exigências de aminoácidos sulfurados digestíveis para suínos machos castrados e fêmeas de 15 a 30 kg

Abstract

-A trial was conducted with fifty pigs (Landrace x Large White), barrows and gilts, from 15 to 30 kg, in the initial growing phase to determine the digestible sulfur amino acids requirements. The animals were allotted to a completely randomized experimental block design, with five treatments (0.502, 0.530, 0.558, 0.586, and 0.614% of digestible methionine plus cystine), five replicates and two animals (one male and one female) per experimental unit. It was observed quadract effect of treatments on daily weight gain, that increased up to the level of 0.582%, on feed:gain ratio, that decreased up to the level of 0.588%, and on daily feed intake, that increased up to the level of 0.579%. The intake of digestible methionine and cystine linearly increased as the dietary levels of digestible methionine plus cystine increased. It was observed quadract treatment effect on fat deposition, that increased up to the level of 0.556%, but no treatment effect on protein deposition was detected. It was concluded that the digestible sulfur amino acid requirement for barrows and gilts from 15 to the 30 kg is of 0.582 and 0.588%, that corresponds to a digestible methionine plus cystine:digestible lysine ratio of 63%, respectively, for the highest weight gain and lowest feed:gain ratio.Key Words: genotype, initial phase, digestible amino acid, requirement IntroduçãoNa composição das dietas tradicionais no Brasil, à base de milho e farelo de soja, a metionina + cistina são consideradas o segundo aminoácido limitante para suínos em crescimento, principalmente quando o objetivo é maximizar o crescimento e o desenvolvimento desses animais (Leibholz, 1984).Sabe-se que a expressão gênica, além dos efeitos ambientais, sociais e sanitários, pode exercer efeitos primários sobre o desempenho animal se as exigências nutricionais não forem devidamente atendidas e que a subnutrição opõe-se à produtividade, afetando a qualidade do produto. Entretanto, a provisão excessiva de nutrientes pode ser ainda mais onerosa que as deficiências, por limitar a produção e, concomitantemente, elevar o custo da alimentação.Nos últimos anos, a alta demanda dos consumidores e da indústria por carne suína com pouca gordura tem estimulado as grandes empresas suinícolas à maximização do crescimento

Maintaining the same ratio between standardized ileal digestible methionine and cysteine do not affect its requirements for starting pigs

“…Evaluating dietary SID Met + Cys levels for barrows and gilts (15-30 kg), Moura et al (2006) observed a better ADG at 5.82 g/kg of SID Met + Cys, which is lower than the obtained in this study (6.61 g/kg). The NRC (2012) proposed 6.8 g/kg SID Met + Cys as the requirement for barrows and gilts, that is close to the optimum level obtained for the ADG in the current study (6.61 g/kg).…”

Carcass characteristics and meat quality of finishing gilts fed diets with different levels of SID methionine + cystine and vitamin B6 supplementation

“…Vaz et al (2005) and Moura et al (2006) observed a lower fat deposition in the carcasses of growing pigs, while Pena et al (2008) obtained the lowest cholesterol levels in the loin and backfat of finishing pigs fed a diet with a Met + Cys/lysine ratio of 0.66.…”

Methionine + cystine levels and vitamin B6 supplementation on performance and enzyme expression of methionine metabolism of gilts from 75 to 100 kg

“…According to Le Bellego and Noblet (2002) and Moura et al (2006), the possible amino acid imbalance caused by a deficiency or Table 4 -Plasma levels of glucose, urea, creatinine, triglycerides, and total protein in female pigs from 75 to 100 kg fed diets containing different levels of standardized ileal digestible (SID) methionine + cystine (Met+Cys) and B 6 vitamin supplementation excess of SID Met+Cys in the diet negatively influences the voluntary food intake of the animals. Despite the varying SID Met+Cys levels (0.370-0.670%) evaluated in this study, the ADFI of the animals was not affected.…”