Fecha/hora: 10/06/2024 10:15:07

Biblioteca(s): | INIA Treinta y Tres.
Fecha corriente: | 01/07/2020
Fecha de la última actualización: | 06/06/2023
Autoria: | SAVIAN, J.V.; SCHONS, R.M.T.; MEZZALIRA, J.C.; BARTH NETO, A.; NETO, G.F. DA SILVA; BENVENUTTI, M.A.; CARVALHO, P.C. DE F.
Afiliación: | JEAN VICTOR SAVIAN, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay // Grazing Ecology Research Group, Federal University of Rio Grande do Sul. RS, Brazil.; R.M.T. SCHONS, Grazing Ecology Research Group, Federal University of Rio Grande do Sul, Porto Alegre, Brasil.; J. C. MEZZALIRA, Grazing Ecology Research Group, Federal University of Rio Grande do Sul, Porto Alegre, Brasil.; A. BARTH NETO, Grazing Ecology Research Group, Federal University of Rio Grande do Sul, Porto Alegre, Brasil.; G. F. DA SILVA NETO, Grazing Ecology Research Group, Federal University of Rio Grande do Sul, Porto Alegre, Brasil.; Queenland Department of Agriculture and Fisheries, Australia.; P.C. DE F. CARVALHO, Grazing Ecology Research Group, Federal University of Rio Grande do Sul, Porto Alegre, Brasil.
Título: | A comparison of two rotational stocking strategies on the foraging behaviour and herbage intake by grazing sheep.
Año de publicación: | 2020
Fuente/Imprenta: | Animal, 2020, Volume 14, issue 12, pp. 2503-2510. https://doi.org/10.1017/S1751731120001251  -- OPEN ACCESS.
ISSN: | 1751-7311 (Print); 1751-732X (Online).
DOI: | 10.1017/S1751731120001251
Idioma: | Inglés
Notas: | Article history: Received 5 March 2018; Accepted 22 May 2020. Published online by Cambridge University Press: 16 June 2020. --

Contenido:

Abstract:
An understanding of the processes involved in grazing behaviour is a prerequisite for the design of efficient grassland management systems. The purpose of managing the grazing process is to identify sward structures that can maximize animal forage daily intake and optimize grazing time. Our aim was to evaluate the effect of different grazing management strategies on foraging behaviour and herbage intake by sheep grazing Italian ryegrass under rotational stocking. The experiment was carried out in 2015 in southern Brazil. The experimental design was a randomized complete block with two grazing management strategies and four replicates. The grazing management treatments were a traditional rotational stocking (RT), with pre- and post-grazing sward heights of 25 and 5 cm, respectively, and a ?Rotatinuous? stocking (RN) with pre- and post-grazing sward heights of 18 and 11 cm, respectively. Male sheep with an average live weight of 32 ± 2.3 kg were used. As intended, the preand post-grazing sward heights were according to the treatments. The pre-grazing leaf/stem ratio of the Italian ryegrass pasture did not differ between treatments (P > 0.05) (~2.87), but the post-grazing leaf/stem ratio was greater (P < 0.001) in the RN than in the RT treatment (1.59 and 0.76, respectively). The percentage of the non-grazed area was greater (P < 0.01) in post-grazing for RN compared with RT treatment, with an average of 29.7% and 3.49%, respectively. Herbage nutritive value was greater for the RN than for the RT treatment, with greater CP and lower ADF and NDF contents. The total time spent grazing, ruminating
and resting did not differ between treatments (P > 0.05), with averages of 439, 167 and 85 min, respectively. The bite rate, feeding stations per min and steps per min by sheep were greater (P < 0.05) in the RN than in the RT treatment. The grazing time per hour and the bite rate were greater (P < 0.05) in the afternoon than in the morning in both treatments. The daily herbage intake by sheep grazing Italian ryegrass was greater (P < 0.05) in the RN than in the RT treatment (843.7 and 707.8 g
organic matter/sheep, respectively). Our study supports the idea that even though the grazing time was not affected by the grazing management strategies when the animal behaviour responses drive management targets, such as in ?Rotatinuous? stocking, the sheep herbage intake is maximized, and the grazing time is optimized.

Palabras-Clave: | GRAZING BEHAVIOUR; GRAZING MANAGEMENT; INTAKE RATE; ITALIAN RYEGRASS; SWARD STRUCTURE.
Categoría del tema: | F62 Fisiología  de la planta - Crecimiento y desarrollo
URL: | https://www.sciencedirect.com/science/article/pii/S1751731120001251/pdf
Registro original: | INIA Treinta y Tres (TT)
Ejemplares: | TT - (103114-1) - PXI - AP - DD - PP/ANIMAL (Cambridge)/2020 -  -  - DIS