Resumo

MUNOZ-GONZALEZ, Juan Carlos et al. Production and nutritional quality of forages in conditions Humid Tropics of Mexico. Rev. Mex. Cienc. Agríc [online]. 2016, vol.7, n.spe16, pp.3315-3327. ISSN 2007-0934.

In aim to determine the nutritional quality of forages in a production system of dual purpose bovines in southeastern Mexico, forage samples were taken using exclusion cages and forage available in the meadow by Hand Plucking to determine: content crude protein (PC), neutral detergent fiber (FDN), acid detergent fiber (FDA) and the minerals copper (Cu), iron (Fe), zinc (Zn), calcium (Ca), magnesium (Mg), sodium (Na ), potassium (K) and phosphorus (P) in five cattle ranches in the humid tropics of Chiapas, throughout the year. The data analysis considered the fixed effects ranch month of the year, time of year, forage species and sampling technique used. There were differences (p< 0.05) between seasons ranches and content PC, FDN, FDA and between ranches in mineral content; there were differences (p< 0.05) between the months of the year and between forage species in the content of FDN and FDA, and differences (p< 0.05) in the contents of PC, FDN, FDA, Cu, Zn, Mg, Na and K between sampling techniques used. It is concluded that the nutritional quality of forages is affected by the season, being the rainy season and norths where there is the greatest FDN, but with lower contents of PC and FDA. The 100, 28 and 72% of samples of fodder had values below the minimum level of Cu, Zn and P, respectively. Forages collected in the exclusion cages were 6, 10, 23, 11 and 53% PC, FDA, Cu, Zn and Na, respectively, fodder available on the prairie.

Palavras-chave : cattle; dual purpose; growth rate; seasons.

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