Influence of hay quality and pasture location on performance of beef cattle grazing oats

Arelovich, H. M.; Laborde, H. E.; Arzadún, M.; Vásquez, Magaly

doi:10.5424/sjar/2004021-60

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…6). This result was unexpected, as N fertilization is a technology scarcely applied by cow-calf farmers (Rearte and Pordomingo, 2014), while hay and oat crop are frequently used as extra feed sources for autumn-winter (Arelovich et al, 2004). Increasing forage production by N fertilizing pastures on autumn may provide some extra advantages including reducing the area for forage cropping (Pacín and Oesterheld, 2015), ecosystem services as a sink of C sequestered in soil OM beneath the grasslands (Lemaire et al, 2011), and also in some cases a free-cost extra spring growth, but the risk of N leaching would require examination (Berger et al, unpublished companion paper).…”

Section: Implications For Cow-calf Systems In Argentinamentioning

confidence: 99%

Feedbase intervention in a cow-calf system in the flooding pampas of Argentina: 2. Estimation of the marginal value of additional feed

Berger

Bilotto

Bell

et al. 2017

Agricultural Systems

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Section: Implications For Cow-calf Systems In Argentinamentioning

confidence: 99%

Feedbase intervention in a cow-calf system in the flooding pampas of Argentina: 2. Estimation of the marginal value of additional feed

Berger

Bilotto

Bell

et al. 2017

Agricultural Systems

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“…Para mejorar la digestibilidad y el consumo voluntario de los forrajes de baja calidad, existen metodologías que pueden dividirse en dos grupos: las que modifican algunas características del forraje (molido. pelleteado) y las que proveen nutrientes críticos suplementarios, fundamentalmente nitrógeno, que mejora la competencia de microorganismos fibrolíticos a nivel ruminal, tornando más eficiente la utilización de los forrajes de baja calidad2 .La amonificación es uno de los tratamientos químicos utilizados para proveer nutrientes nitrogenados. Como fuentes de amoníaco se han empleado diferentes compuestos químicos entre los cuales se encuentran amonio anhidro (NH 3 ), hidróxido de amonio (NH 4 OH) y urea11 .…”

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Resultados de la amonificación con urea sobre la degradabilidad ruminal de Hemarthria altissima y Cynodon nlemfuensis en bovinos

Martínez

Slanac

Kucseva³

2016

Rev. vet.

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El objetivo del ensayo fue evaluar el efecto del agregado de urea sobre la degradabilidad de la materia seca en henos de Hemarthria altissima cv bigalta (pasto clavel) y Cynodon nlemfuensis (pasto estrella). Los trabajos se realizaron desde marzo de 2011 a marzo de 2012 en la Estación Experimental Colonia Benítez del Instituto Nacional de Tecnología Agropecuaria-INTA (Chaco, Argentina). Muestras del material de ambos vegetales fueron deshidratadas y luego amonificadas con diferentes porcentajes de urea (0; 2; 4; 6%). Luego, según la técnica de “suspensión in situ”, fueron introducidas en el rumen de cuatro novillos cruza cebú de 3,5 años de edad y 420 kg de peso vivo, a través de una cánula ruminal implantada en el ijar izquierdo. Para la estimación de la cinética de digestión de la materia seca (MS), se utilizó el modelo propuesto por Orskov et al. (1980). La degradabilidad efectiva se calculó de acuerdo a la ecuación de los mismos autores. La cinética de la degradación de H. altissima no arrojó diferencias significativas. En cambio, para C. nlemfuensis se registraron diferencias para la degradabilidad ruminal de MS a tasas del 4% (p=0,01) y 2% (p=0,02), en ambos casos con presentación de efectos cúbico y cuadrático. Se concluye que la degradabilidad ruminal de la MS del heno de H. altissima no sufrió cambios con el agregado de urea, en cambio, se registró mayor degradabilidad en aquéllos henos de C. nlemfuensis que recibieron urea a razón de 20 y 40 g por kg de pasto seco.

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Effects of oats grain supplements on performance, rumen parameters and composition of beef from cattle grazing oats pasture

Arelovich

Marinissen²,

Gardner³

et al. 2017

Anim. Prod. Sci.

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The impacts of supplementing with whole oats grain (OG) upon performance and beef quality traits of growing steers grazing oats pasture (OP) were measured. The trial used Angus steer calves (203 kg mean bodyweight) assigned to three treatments: Control, unsupplemented OP (CON); OP plus OG fed at 0.25% BW daily (OG1); and OP plus OG fed at 0.50% bodyweight daily (OG2). All steers grazed the same paddock but were removed momentarily once daily so OG could be fed to each steer individually. Daily intake of OG averaged 597 and 1294 g DM for OG1 and OG2, respectively. Steers were slaughtered after grazing for 130 days to determine carcass characteristics and lipid profiles. In parallel with the grazing trial, four ruminally cannulated steers (613 kg mean bodyweight) were allocated to treatments CON and OG2 (n = 2) to monitor ruminal pH, volatile fatty acids, and NH3-N. Steers fed OG2 had greater (P < 0.01) average daily gain than CON; final liveweight for OG2 steers was significantly higher than both CON and OG1 steers. Although variations in plasma haematocrit and alkaline phosphatase were they did not affect animal performance. Dressing percentage was not affected by the experimental diets but OG2 steers had greater (P < 0.05) marbling scores. Although rib-eye area was numerically greater for OG1 and OG2 than CON steers (8% and 14%), these differences were not significant statistically (P = 0.3493). Intramuscular lipid content of Longissimus dorsi muscle was not significantly increased by OG supplementation but of the intramuscular fatty acids, contributions of vaccenic and α-linolenic acids decreased (P < 0.05). Linoleic acid content was lowest (P < 0.05) for OG1 steers. A no significant decrease in conjugated linoleic acid was detected when more OG was supplemented. No treatment differences in the contributions of eicosapentaenoic acid, docosahexaenoic acid, monounsaturated fatty acids, polyunsaturated fatty acids, saturated fatty acids, n-6 or n-3 to intramuscular fatty acids were detected although the n-6 : n-3 resulted numerically higher (11% and 23%) for OG1 and OG2 steers than CON steers. Rumen pH, NH3-N and volatile fatty acids were not significantly altered by OG supplementation. Supplementing diets of cattle grazing OP improved performance without rumen digestion impairs or inducing substantial changes in the lipid profile of intramuscular fat. Thus, OG supplementation would be expected to improve the efficiency of cattle grazing of OP without substantial changes to ruminal measurements or the lipid profile of beef.

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Influence of hay quality and pasture location on performance of beef cattle grazing oats

Cited by 3 publications

References 20 publications

Feedbase intervention in a cow-calf system in the flooding pampas of Argentina: 2. Estimation of the marginal value of additional feed

Feedbase intervention in a cow-calf system in the flooding pampas of Argentina: 2. Estimation of the marginal value of additional feed

Resultados de la amonificación con urea sobre la degradabilidad ruminal de <i>Hemarthria altissima</i> y <i>Cynodon nlemfuensis</i> en bovinos

Effects of oats grain supplements on performance, rumen parameters and composition of beef from cattle grazing oats pasture

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