Performance of small grain pastures in Santa Rosa, La Pampa. II. Estimation of rumen degradability in sacco

  • C. M. Ferri Universidad Nacional de La Pampa, Facultad de Agronomía
  • N. P. Stritzler Universidad Nacional de La Pampa, Facultad de Agronomía

Keywords:

small grain pastures, ruminal degradation,

Abstract

The objetive of this study was to evaluate dry matter (DM) rumen degradation kinetics of cultivars (cvs) of small grain pastures. Cultivars were: avena (Avena sativa L.) cv Don Victor, avena (Avena byzantina C. Koch) cv Millauquén, cebada (Hordeum vulgare L.) cv Ullaiché, centeno (Secale cereale L.) cvs Choiqué y Naicó, tricepiro (Triticum x Secale x Thinopyron) unea 3/40 y triticale (x Triticosecale Witt.) cvs Don Norman y Tehuelche. Each plot was cuftour times, on the followingdates: June r-, August 12th, September 30th and November 30th The harvested forage, dried and milled, was incubated in the rumens into suspended nylon bags. Three Holstein-Freisian steers, titted with permanent rumen canulae were used in the experiment. Animals were fed on ad libitum alfalfa hay and water. Ruminal degradability was estimated using DM rate of disappearance, through an exponential model p = a + b(1- exp(-ct)). Data were compared by ANOVA, under a split-plot design Treatment mean were separated using Tukey's test (α= 0.05). Most differences between cultivars in effective degradability were given by differences in the soluble:insoluble potentially degradable fractions ratio, and due to different fractional rates of degradation. Non-degradable fraction was similar (p>0.05) between cultivars.

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References

AKIN, D.E. 1989. Histological and physical factors affecting digestibility of forages. Agron. J. 81:17-25.

Perspectives of ce11 wall biodegradatlon. In: Jung, H.G.; Buxton, D.R.; Hatfield, RO. y Ralpheds, J. (eds.). Forage cell wall structure and digestibility. ASA,CSSA,SSSA, USA.

BRAZLE, F.K. Y HARBERS, L.H. 1977. Digestion of alfalfa hay observed by scanning electron microscopy. J. Anim. Sci. 46:506-512.

CAIRNIE, A.G. 1984. Triticale: verdeo invernal con buenas características para la zona semiárida. Informativo EEA Anguil 82:2-3.

COVAS, G. 1976. Tricepiro: un nuevo verdeo que involucra al trigo, centeno y agropiro. Informativo EEA Anguil 68:5-7.

y FRECENTESE, M.A. 1982. Dos nuevos cultivares de triticale forrajero para la región semiárida. Informativo EEA Anguil 80:1-3.

FRECENTESE, M.A. y COVAS, G. 1984. Comportamiento de nuevos verdeos en la región pampeana semiárida. Informativo EEA Anguil 82:3-4.

HERNANDEZ, RA. y GONELLA, CA 1986. Verdeos invernales para el noroeste de la provincia de Buenos Aires. Boletín Técnico Informativo. EEA Villegas 2:6-9.

-- y GONELLA, C.A. 1989. Evaluación de verdeos invernales. Boletín Técnico Informativo. EEA General Villegas 7:3-7.

HOOPER, A.P. y WELSCH, J.G. 1985. Effects of particle size and forage composition on functional specific gravity. J. Dairy Sci. 68:1181-1188.

LINDBERG,J.E. 1985. Estimation of rumen degradability of feed proteins with the in SACCO technique and various in vi/ro methods: A review. Acta Agric. Scand. 25:64-97.

MADSEN, J. y HVELPLUND, T. 1985. Protein degradation in the rumen. A comparison between in vivo, nylon bag, in vi/ro and buffer measurements. Acta Agric. Scand. 25:103-124.

McDONALD, 1. 1981. A revised model for the estimation of protein degradability in the rumen. J. Agric. Sci., Cambo96:251-252.

MEHREZ, A.Z. y ORSKOV, E.R 1977. A study of the artificial fibre bag technique for determining the digestibility of feeds in the rumen. J. Agric. Sci., Cambo88:645-650.

MERTENS, D.R 1977. Dietary fiber components: relationship to the rate and extent of ruminal digestion. Federation Proc. 36:187-192.

MERTENS, D.R y ELY, L.O. 1982. Relationship of rate and extent of digestlon to forage utilization -a dynamic model evaluation. J. Anim. Sci. 64:893-905.

MILLER, J.R Y HOBBS, N.T. 1994. Effect of forage hydration on lag time during In vitro digestion of meadow hay. Grass and Forage Sci. 49:107-110.

MINSON, J.M. 1990. Ruminant production and forage nutrients. In: Cunha, T.J. (eds.). Forage in ruminant nutrition. CSIRO SI. Lucia, Cueensland, Australia. pp 1-8.

ORSKOV, E.R y McDONALD, 1.1979. The estlmation of protein degradability in the rumen from incubation measurement weighed according to rate of passage. J. Agric. Sci., Cambo92: 499-503.

ORSKOV, E.R., REID, G.w. y KAY, M. 1988. Prediclion of intake by cattle from degradation characteristics of roughages. Anim. Proclo46:29-34.

ORSKOV, E.R. y RYLE, M. 1990. Energy nutrition in ruminanls. Elsevier Applied Sci., London, New York, 149 p.

STEEL, R.G. y TORRIE, J.H. 1960. Principies y proceduces of statistics. McGraw-HiII, New York. 481 p.

TOMASO, J.C. 1990. Avena Millauquén INTA. EEA Bordenave, INTA. Circular de extensión N° 28.

VAN SOEST, P.J. 1982. Nutritional ecology of lhe ruminanl. Corvallis, Oregon. O y B Books Inc. 373 p.

WEAKLEY, D.C., STERN, M.O. y SATTER, L.D. 1983. Factors affecting disapperance of feedstuffs from bags suspended in the rumen. J. Anim. Sci. 56:493-507.

WILSON, 1993. Organization of forages planl tlssues. In: Jung, H.G.; Buxton, D.R.; Hatfield, R.O. y Ralpheds, J. (eds.). Forage cell wall structure and digestlbility. ASA, CSSA, SSSA, USA.

Published

2020-05-22

How to Cite

Ferri, C. M., & Stritzler, N. P. (2020). Performance of small grain pastures in Santa Rosa, La Pampa. II. Estimation of rumen degradability in sacco. Semiárida, 9(1), 17–24. Retrieved from https://ojs.unlpam.edu.ar/index.php/semiarida/article/view/4853

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Artículos Científicos y Técnicos