Results 261 to 270 of about 904,528 (289)

A model of a grass sward continuously grazed to a constant mean height

Ecological Modelling, 1991
Abstract A model was constructed to simulate the canopy development of a vegetative grass sward, continuous grazed to a constant mean height. Additional submodels were constructed or adapted to simulate grazing and the physiological response of the plants to defoliation and the environment.
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A comparison of diploid and tetraploid perennial ryegrass and tetraploid ryegrass/white clover swards under continuous sheep stocking at controlled sward heights. 1. Sward characteristics

Grass and Forage Science, 1993
AbstractTwo 1·0 ha plots of a late‐heading diploid perennial ryegrass (var. Contender) and a late‐heading tetraploid ryegrass (var. Condesa), and two 1·4 ha plots of the tetraploid with Aberystwyth S184 small‐leaved white clover, were direct sown in May 1987.
Swift, G, Vipond, JE, McClelland, TH, Fitzsimons, J, Milne, JA, Hunter, EA   +5 more
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The relationship between level of sward height reduction in a rotationally grazed sward and short‐term intake rates of dairy cows

Grass and Forage Science, 1999
The objective of this study was to investigate the relationship between level of sward height reduction (SHR) and short‐term intake of herbage by lactating dairy cows offered swards differing in initial bulk density (BD). Three experiments were carried out in which cows were presented with swards representing different levels of SHR (nominally ...
null McGilloway, null Cushnahan, null Laidlaw, null Mayne, null Kilpatrick   +4 more
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Ewe and lamb performance on perennial ryegrass and perennial ryegrass plus white clover swards under controlled sward heights

Proceedings of the British Society of Animal Production (1972), 1989
Lamb performance at grass falls in July/August on upland farms. Allowing sward height to rise has been recognised as having an amoreilating effect. The objective of this trial was to determine the influence of both sward quantity (sward height) and sward quality (sward type) on ewe and lamb performance from mid April to September.
J.E. Vipond, G. Swift, J. FitzSimons, T.H. McClelland, J.A. Milne, E.A. Hunter   +5 more
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Effects of sward height and concentrate supplementation on the ingestive behaviour of spring-calving dairy cows grazing grass-clover swards

Applied Animal Behaviour Science, 1994
Abstract Forty-eight, lactating, spring-calving, multiparous, Holstein-Friesian cows, continuously stocked on mixed grass-clover swards, were blocked by calving date, parity and milk yields in week 2 of lactation and randomly allocated to six treatments: 0 (U) or 4 (S) kg concentrate supplementation at sward heights of 40, 60 or 80 mm as measured by ...
A.J. Rook, C.A. Huckle, P.D. Penning
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Effect of sward surface height on the performance of ewes and Iambs continuously grazed on grass/clover and nitrogen‐fertilized grass swards

Grass and Forage Science, 1992
AbstractIn three successive years, sward height was maintained at 3, 5, 7 or 9 cm on grass swards receiving a total of 300 kg N ha−1 in six equal monthly dressings from April, and on grass/clover swards receiving 50 kg N ha−1 as a single dressing in early spring. From turnout in April until weaning in July, 64 ewes and their lambs (mean litter size 1·5)
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Effect of sward surface height and level of herbage depletion on bite features of cattle grazing Sorghum bicolor swards.

Journal of animal science, 2014
To maximize herbage DMI, pregrazing sward surface height (SSH) and level of herbage depletion (HD) must be such that variables determining short-term herbage intake such as bite mass (BM) and bite rate (BR) are optimized. The objective of this study was to determine a SSH target and the level of HD as a proportion of the SSH that optimizes BM and BR of
Fonseca, L, Carvalho, PCF, Mezzalira, JC, Bremm, C, Galli, JR, Gregorini, Pablo   +5 more
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Forage production and sward height of Panicum pastures

2006
C. Leonelli, M.A.S. Lara, Collucci, Daniel, Pedreira, Bruno Carneiro E, R.L.G. Nave, F. Curcelli, C.G.S. Pedreira   +6 more
openaire   +1 more source

Development of Machine Learning Models to Predict Compressed Sward Height in Walloon Pastures Based on Sentinel-1, Sentinel-2 and Meteorological Data Using Multiple Data Transformations

Remote Sensing, 2021
Jérôme Bindelle, Hélène Soyeurt, Françoise Lessire   +2 more
exaly  

Assessment of Forage Mass From Grassland Swards by Height Measurement Using an Ultrasonic Sensor

Computers and Electronics in Agriculture, 2011
Michael Wachendorf, Thomas Fricke
exaly