Zobrazeno 1 - 10
of 85
pro vyhledávání: '"F.D. Richardson"'
Autor:
F.D. Richardson
Publikováno v:
South African Journal of Animal Science.
Undernutrition of cows grazing semi-arid range as a result of drought or heavy stocking rates reduces prenatal and pre-weaning growth of their ca lves. A mechanistic model has been developed that simulates the productivity of vegetation and cattle on
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f9adc331d36604800c802a6ccc53afd0
https://doi.org/10.4314/sajas.v40i5.65339
https://doi.org/10.4314/sajas.v40i5.65339
Autor:
B.D. Hahn, F.D. Richardson
Publikováno v:
Agricultural Systems. 95:62-75
In this paper, we present the results of an evaluation and report on an application of a short-term (one to two years) mechanistic model of plant and livestock production in the semi-arid Succulent Karoo of Namaqualand in South Africa. The model has
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::422d27f93c224b2122309cbdb287773d
https://doi.org/10.1016/j.agsy.2007.04.003
https://doi.org/10.1016/j.agsy.2007.04.003
Publikováno v:
Journal of Arid Environments. 70:701-717
We investigated the effects of rainfall and the number of animals on changes in vegetation and on the output of milk and meat from the communal areas of Namaqualand. Previously published short- and long-term models link processes that range from the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f7907680e48460bb8d056bf7315c0b54
https://doi.org/10.1016/j.jaridenv.2006.07.013
https://doi.org/10.1016/j.jaridenv.2006.07.013
Publikováno v:
Ecological Modelling. 187:491-512
Two long-term mechanistic models of grazing systems in the semi-arid succulent Karoo have been used to study factors that influence vegetation changes, livestock productivity and sustainability of the ecosystem. In this region of low and highly varia
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a7ccac6bd1cc09c8d42278ca2c32fb77
https://doi.org/10.1016/j.ecolmodel.2005.02.001
https://doi.org/10.1016/j.ecolmodel.2005.02.001
Publikováno v:
Ecological Modelling. 183:211-230
The communal areas of the semi-arid (200 mm) winter-rainfall Namaqualand region of South Africa are heavily utilised by a large number of subsistence farmers who keep sheep and goats. For several decades, farmers have maintained, on average, more tha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f37bcc793128b164f62a89c5e6f0e172
https://doi.org/10.1016/j.ecolmodel.2004.07.028
https://doi.org/10.1016/j.ecolmodel.2004.07.028
Autor:
G. Q. Witten, F.D. Richardson
Publikováno v:
Ecological Modelling. 164:121-135
Rumen microorganisms play a vital role in the digestion of food and the supply of energy and amino acids to the host in the form of volatile fatty acids (VFA) and microbial protein. Because the products of rumen digestion are affected by microbial nu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7f011b9e570d112d847457275505cb77
https://doi.org/10.1016/s0304-3800(02)00383-6
https://doi.org/10.1016/s0304-3800(02)00383-6
Publikováno v:
Agricultural Systems. 76:415-440
This paper presents the context, approach, and overview of a computer based draught animal power simulation model named Draught Animal Power Simulator (DAP-Simulator). The model was developed using data from literature and modified components and mod
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5aa710b7bfa594e13846b096e0a8563e
https://doi.org/10.1016/s0308-521x(01)00111-1
https://doi.org/10.1016/s0308-521x(01)00111-1
Publikováno v:
Agricultural Systems. 76:441-455
Draught Animal Power Simulator (DAP-Simulator) is a computer simulation model developed for smallholder farming systems in which animals are the main source of draught power and nutrition is the main constraint. The description of the model was prese
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8b2f069f3ed282deff92ef8273b4cf28
https://doi.org/10.1016/s0308-521x(01)00112-3
https://doi.org/10.1016/s0308-521x(01)00112-3
Publikováno v:
Agricultural Systems. 62:29-49
Rangelands are complex systems with many interacting components. Modelling such systems presents two particular and interrelated problems. Firstly, the processes involved operate on greatly differing time scales: long-term changes in rangelands typic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::913f7a5d617de00418043a664574de2d
https://doi.org/10.1016/s0308-521x(99)00054-2
https://doi.org/10.1016/s0308-521x(99)00054-2
Publikováno v:
African Journal of Range and Forage Science; Vol 27, No 3 (2010)
African Journal of Range and Forage Science
African Journal of Range and Forage Science
Predicting the effect of different management strategies on range condition is a challenge for farmers in highly variable environments. A model that explains how the relations between rainfall, livestock and vegetation composition vary over time and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a78f1c1c9dc4a0ea11ed8be83cf7a3ec
https://www.ajol.info/index.php/ajrfs/article/view/62222
https://www.ajol.info/index.php/ajrfs/article/view/62222