| Summary: | The objective was determine the degradation and kinetics of in vitro fermentation of excreta of excreta produced and marketed for the feeding of ruminants in the state of Chiapas, Mexico. Twelve samplings were made once the reproductive cycle of two chicken and pig producing farms was completed. A bromatological analysis was performed on the excreta samples (dry matter, organic matter, ash, crude protein, neutral detergent fiber and acid detergent fiber), in vitro gas production (maximum volume, rate, lag phase, fractions of fast, medium and slow fermentation), hemicellulose and copper content. A completely randomized design was used, and the comparison of means was performed using the Tukey procedure (p<0,05). The poultry manure has greater (p<0,05) content of organic matter than swine excreta, which is reflected in a higher (p<0,05) maximum volume (MV) of fermentation gas. The swine excreta it has a lower crude protein content and higher copper content compared to the poultry manure (p<0,05), as well as higher concentration of acid detergent fiber (ADF), thus, the poultry manure present better parameters (MV, rate and lag phase) and fractions of fermentation compared to the swine excreta. It is concluded that the poultry manure they have a better chemical composition tan swine excreta, possibly the latter caused by the high copper content of this, suggesting its limited use in animal feed.
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