This study evaluated the digestibility of cottonseed meal with or without addition of enzymes (phytase and protease) for growing pigs. It was used 18 barrows, housed in metabolism cages, distributed in a completely randomized design, standardizing body weight (bw) with average of 25.8 ± 3.6 kg, with three treatments and six repetitions. The treatments consisted of a reference diet based on corn and soybean meal, the second treatment with replacement of 30% of the reference diet by cottonseed meal without enzymes, and the third with 30% of the reference diet replaced by cottonseed meal with added enzymes. Was determined the digestible protein, digestible energy, digestibility of dry matter, energy and protein. It was also registered the balance of nitrogen and phosphorus. The use of cottonseed meal with the addition of enzymes in diets for growing pigs has no effect on the digestibility of dry matter, gross energy and crude protein, but improved the absorption of phosphorus, consequently reducing its excretion in the feces. There was no improvement in nitrogen balance in the diets containing cottonseed meal with enzymes.

No abstract

Objetivou-se avaliar os parâmetros de desempenho, características de carcaças e viabilidade econômica em fêmeas suínas alimentadas com diferentes níveis de inclusão do farelo de algodão (FA) nas rações. Foram utilizadas 24 fêmeas suínas, com peso vivo médio de 48,20 kg ± 5,44 (fase de crescimento) e de 87,62 ± 6,72 kg (fase de terminação). O delineamento foi em blocos casualizados, com quatro tratamentos (0%, 10%, 20% e 30% de inclusão de farelo de algodão), seis repetições, um animal por unidade experimental. Na fase de crescimento os parâmetros de desempenho não foram influenciados significativamente, na fase de terminação e total houve uma redução do ganho de peso e consumo de ração. Para as características de carcaça os animais apresentaram redução na espessura de toucinho, e um aumento na área de olho de lombo até o nível de 13,5% de inclusão de FA. Quanto ao peso dos órgãos houve um aumento do peso do coração, fígado e rins. Conclui-se que é possível incluir o FA até o nível de 30%, sem afetar as características de desempenho na fase de crescimento, e de até 13,5% sem comprometer o rendimento de carcaças.

Two experiments were conducted with pigs in the growth phase (30–50 kg). Experiment I consisted of a digestibility trial to determine the nutritional value of cottonseed cake with and without addition of an enzyme complex through the method of total collection of excreta. Twenty barrows were used and housed in metabolic cages to collect the total collection of feces and urine. Four treatments and five replications randomized the experimental design completely. Two reference diets and two test diets were experimental (70% reference diet and 30% cottonseed cake), with and without the addition of an enzyme complex. The evaluated variables were: apparent digestibility coefficient of dry matter, of crude protein, of Gross energy, of phosphorus and the values of digestible dry matter, digestible protein, digestible phosphorus, digestible energy and metabolizable energy of cottonseed cake with and without enzymes. The addition of enzymes increased the levels of digestible protein to 0.302–0.313 kg/kg and digestible energy to 2,538–2,894 kcal/kg. Experiment II was conducted to assess barrow performance when they were fed diets containing increasing levels of cottonseed cake protein (0, 20, 40 and 60%), which replaced protein from soybean meal, with the enzyme complex. The design was a randomized block design consisting of four treatments and five replications. The performance, carcass characteristics and biochemical parameters of the blood were evaluated. These results indicate that the protein from soybean meal can be replaced up to 60% by the cottonseed cake protein with enzyme complex in diets for pigs in the growth phase, without sacrificing performance or carcass characteristics