Resumen

CASTRO-HERNANDEZ, Horacio; DOMINGUEZ-VARA, Ignacio Arturo; MORALES-ALMARAZ, Ernesto  y  HUERTA-BRAVO, Maximino. Chemical composition, mineral content and in vitro digestibility from ryegrass (Lolium perenne) in relation to the cutting interval and growing season. Rev. mex. de cienc. pecuarias [online]. 2017, vol.8, n.2, pp.201-210. ISSN 2448-6698.  https://doi.org/10.22319/rmcp.v8i2.4445.

The objective was to evaluate the nutritive quality of forage ryegrass (Lolium perenne) at different maturity (0, 7, 14 and 28 d) in three seasons of the year, autumn (A), winter (W) and spring-summer (SS) in an experimental design randomized with factorial treatments 4x3 arrangement. The maturity of the plant increased in linear and quadratic form the content of dry matter, acid detergent fiber and acid detergent lignin, and quadratic form of neutral detergent fiber; organic matter (OM) content fell in linear and quadratic form and the crude protein (CP) is reduced linearly by the maturity of the forage. The biggest contribution of OM and CP was in SS (P<0.01). Total gas production, degradability and relative gas production, fell in linear and quadratic form (P<0.05) with the maturity of the plant. Degradability and relative gas production were greater in the zero-day and at the season SS; the volume of gas produced by cutting interval effect, in three times, decreased with the age of the forage. The delay time of incubation was greatest (P<0.01) in SS. The mineral concentration in the forage was affected (P<0.05) by the range of cutting and the season of year; higher mineral content was in the zero-day cut and in SS. Concentrations of P, Ca, K, Mg, and Zn do not meet requirements for lactating cows at any seasons by maturity stage combination. The best forage quality was obtained in SS before 28 d of regrowth age.

Palabras llave : Chemical composition; Minerals; Digestibility; Age; Season; Ryegrass.

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