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Articles 1231 - 1260 of 14771
Full-Text Articles in Agricultural Science
Selection For Seed Production And Dry Season Forage Yield In Panicum Maimum Germplasm, L Jank, Y H. Savidan
Selection For Seed Production And Dry Season Forage Yield In Panicum Maimum Germplasm, L Jank, Y H. Savidan
IGC Proceedings (1977-2023)
Panicum maximum cv. 'Coloniiio' is the most popular tropical forage grass in terms of cattle finishing in Brazil. It is, however, slowly being substituted by other species, because of its high demands for nutrients and poor dry season growth. The National Beef Cattle Research Center of EMBRAPA at Campo Grande, Mato Grosso do Sul, has underway a P. maximum breeding program, with the objectives of selecting cultivars which while maintaining the good qualities of the 'Coloniiio', are more drought-resistant and adapted either to the traditional fertile soils of 'Coloniiio', or to weak cerrado (savanna) soils. Preliminary results on seed production …
Preliminary Evaluation Of Panicum Maximum Germplasm In Brazil: An International Agronomy Research Program, Y H. Savidan, L Jank, F.H.D De Souza, A Boock
Preliminary Evaluation Of Panicum Maximum Germplasm In Brazil: An International Agronomy Research Program, Y H. Savidan, L Jank, F.H.D De Souza, A Boock
IGC Proceedings (1977-2023)
Following former recommendations to leave traditional schemes of simultaneous evaluation of several species, and extensive program has been initiated as a result of an international agreement between French and Brazilian research organizations, to evaluate one single tropical forage grass species with wide genetic diversity. A field experiment was designed for preliminary evaluation of 400 accessions of Panicum maximum at two levels of soil fertility. Emphasis is placed on a fixed-interval cutting regime, seed production, and detailed morphological characterization of promising accessions. A list of the morphological descriptors is presented. Selected accessions will enter further phases of evaluation under grazing and …
Collection Of Germplasm Of Desmodium And Related Genera In Indonesia, K L. Mehra
Collection Of Germplasm Of Desmodium And Related Genera In Indonesia, K L. Mehra
IGC Proceedings (1977-2023)
17 species of Desmodium and 5 species of the related genera were collected from the islands of Sulawesi, Java, Timor and Sumba. The collection sites differed in rainfall, altitude, soil pH, vegetation and other eco-geographic characteristics. Several samples with good agronomic potential were collected from acid infertile soils. The collections differed in growth habit, biomass production, leafiness, seed setting and adaptation to problem soils. Promising collections for use in crop improvement programme were identified.
Collecting Germplasm Of Desmodium And Puerarua Phaseoloides In Thailand And Peninsular Malaysia, S Pattanavibul, R Schultze-Kraft
Collecting Germplasm Of Desmodium And Puerarua Phaseoloides In Thailand And Peninsular Malaysia, S Pattanavibul, R Schultze-Kraft
IGC Proceedings (1977-2023)
A collaborative program to collect native legume germplasm in Thailand and peninsular Malaysia is described. Three collection expeditions were carried out in 1979, 1982, and 1984 with particular emphasis on broadening the genetic bases of Desmodium species and Pueraria phaseoloides. In total, 593 samples were collected: 60% were species of Desmodium and its allied genera Dendrolobium, Dicerma, Hegnera, Phyllodium, and Tadehagi, 12% were P. phaseoloides material and the remaining 28% were germplasm of other genera such as Abrus, Alysicarpus, Atylosia,Dunbaria, Flemingia, and Uraria. The importance of increased genetic variability within the species D. ovalifolium and P. phaseo/oides …
Development Of An International Collection Of Tropical Forage Germplasm For Acid Soils, R Schultze-Kraft
Development Of An International Collection Of Tropical Forage Germplasm For Acid Soils, R Schultze-Kraft
IGC Proceedings (1977-2023)
SUMMARY A Program conducted by the Centro Internacional de Agricultura Tropical ( CIA T) to develop a collection of forage plant germplasm resources for tropical pasture research in acid, infertile soil areas is described. After an initial 5-year stage of preliminary work in germplasm collection and introduction, 28 major expeditions to collect native germplasm of tropical forage species were carried out in 10 countries on 3 continents, principally in regions with acid soils of low fertility during 1977 to 1984. Emphasis has been on legumes,mainly Centrosema, Desmodium, Stylosanthes, and Zornia, in tropical America, andDesmodium, its allied genera, andPueraria in Southeast …
A Global Plan For Forage Genetic Resources, W. Ellis Davies
A Global Plan For Forage Genetic Resources, W. Ellis Davies
IGC Proceedings (1977-2023)
Initially the Board's work gave priority to major crops but latterly more attention has been given to forage plants. Forages now have a high priority in the following IBPGR regions: Mediterranean, Southwest Asia, Central Asia, Southeast Asia, East Asia, Central America, the Andean region, southern South America and Europe. One major difficulty with forage plants is the large number of genera/ species - numbering into thousands which have some forage value. For practical operational reasons the world forage genetic resources have been considered under headings (a) Tropical and sub-tropical areas (b) Mediterranean and adjacent semi-arid/areas and (c) Temperate areas. Because …
Modification Des Facteurs Biotiques Par La Presence D'Arbres En Region Mediterraneenne Francaise: Effets Sur La Production Herbagere, B Msika, M Etienne
Modification Des Facteurs Biotiques Par La Presence D'Arbres En Region Mediterraneenne Francaise: Effets Sur La Production Herbagere, B Msika, M Etienne
IGC Proceedings (1977-2023)
La region mediterraneenne franc;:aise se caracterise par !'importance de son territoire forestier qui, bien que souvent degrade, comporte une grande variete d'especes arborees. II s'agit principalement de peuplements forestiers spontanes geres en taillis ou de reboisements en resineux. Abandonnes depuis les annees 40, ces espaces sont devenus totalement improductifs et posent des problemes de protection contre Jes incendies ou de gestion sylvicole adaptee. Dans le contexte actuel, et dans ce type de milieu, la diversification des productions semble etre une voie interessante a creuser. Les amenagements sylvopastoraux pourraient done constituer une alternative interessante ; encore faut-il que Jes conditions optimales …
Living Heritage, Resilience And Ethically Informed Infrastructures In Malawi, Martha B. Lerski, Frank Puluputu Mwale
Living Heritage, Resilience And Ethically Informed Infrastructures In Malawi, Martha B. Lerski, Frank Puluputu Mwale
Publications and Research
Rooted in a rural community’s needs, this paper explores how historically, and ethically informed infrastructures can support community engagement towards identification, documentation, and dissemination of local, traditional, and indigenous knowledge relating to climate change. The paper examines climate adaptation and sustainability issues through the lenses of community organizing and Library & Information Science best practices. It draws on a growing body of literature identifying a role for expanded epistemological and subject discipline perspectives. While the impacts of climate on material culture are increasingly recognized, intangible, and biocultural heritage have not received as much attention. Living heritage traditions and knowledge systems …
The Dynamics Of Daily Area And Depth Of Grazing And Herbage Intake Of Cows In A Five Day Paddock System, M H. Wade, J L. Peyraud, G Lemaire, E A. Comeron
The Dynamics Of Daily Area And Depth Of Grazing And Herbage Intake Of Cows In A Five Day Paddock System, M H. Wade, J L. Peyraud, G Lemaire, E A. Comeron
IGC Proceedings (1977-2023)
Optimisation of animal production per unit area results in a penalty to individual animal production and herbage intake. The objective of the present study was to examine the dynamic changes in a grass sward in relation to declining production and herbage intake in five day paddocks grazed by dairy cows. The study formed part of a larger project to examine the effects of stocking rate and grazing method upon milk production and herbage intake that is reported by Peyraud et al. (1989).
The Relationship Of Herbage Intake Of Cattle To Herbage Mass, And Its Utilization On Rotationally Grazed Pasture, T Okajima, K Sawada, H Noriike, H Yokota
The Relationship Of Herbage Intake Of Cattle To Herbage Mass, And Its Utilization On Rotationally Grazed Pasture, T Okajima, K Sawada, H Noriike, H Yokota
IGC Proceedings (1977-2023)
In the central part of Honshu island in Japan, seasonal variation of herbage mass is also large (Okajima et al., 1985). So, when the grazing managements, i.e. stocking rate, grazing intensity etc., were not appropriate, part of herbage produced was lost through standing dead and litter, or grazing cattle lose their body weight. Sward characteristics affect the grazing behaviour of cattle (Jamieson and Hodgson, 1979), and then affect the herbage production and utilization. Relative herbage intake of cows was related to sward height (Baker et al., 1981). So, sward height was used as the indicator of the grazing management in …
The Effect Of Daily Herbage Allowance On The Ingestive Behavior Of Dairy Cows, M Rogalski, J Kryszak, Z Karzoun
The Effect Of Daily Herbage Allowance On The Ingestive Behavior Of Dairy Cows, M Rogalski, J Kryszak, Z Karzoun
IGC Proceedings (1977-2023)
In conditions of pasture feeding sward selection and consumption by grazing animals is strongly influenced by characters of herbage (Forbes, 1986). Quantitative and qualitative state of the sward affects its consumption primarily through changes of such elements in animal behaviour as grazing time and number and size of bites (Hodgson, 1982, 1985). Relativelyt much research has been done to investigate the response to the grazed sward of such ruminants as sheep, while the response of cattle, and particularly of dairy cows, has received much less attention (Arnold, 1981 ; Holmes, 1980). This paper presents results of investigations on the effect …
Effect Of Grazing On Pasture Production In South-West Western Australia, K.M S. Curtis, A C. Dunlop, T O. Albertson
Effect Of Grazing On Pasture Production In South-West Western Australia, K.M S. Curtis, A C. Dunlop, T O. Albertson
IGC Proceedings (1977-2023)
INTRODUCTION With a mediterranean climate in the south-west of Western Australia, pastures are composed of annual species from the genera Trifolium, Hordeum, Lolium, Bromus, Vulpia, Erodium and Artotheca. The length of the growing season ranges from 9 months near the coast to less than 5 months in the eastern wheatbelt. Seven million hectares of pastures are grazed predominantly by Merino sheep (about 33 millions). Stoking rate is the major factor affecting wool production on farm. An increase in stocking rate reduces wool production per sheep.Increasing the stocking rate reduces total pasture growth (Dunlop, et al., 1984) and changes the botanic …
Development Of A General Relationship Between Stocking Rate And Animal Production, J.M Van Heerden, N M. Tainton
Development Of A General Relationship Between Stocking Rate And Animal Production, J.M Van Heerden, N M. Tainton
IGC Proceedings (1977-2023)
One of the best known mathematical representations of the relationship between stocking rate and individual animal production, that of Mot (1960), postulated a modified exponential relationship. Subsequent workers, however, derived a linear relationship between stocking rate and production per animal unit, at least at stocking rates beyond a certain minimum value. One of these relationships, that of Jones & Sandland (1974), is widely used in South Africa. The results of grazing trials with sheep on complex grass/legume mixtures in the winter rainfall region of South Africa (van Heerden & Tainton, 1987-1988), however, suggested a degree of non-linearity in this relationship. …
Mixed Animal Species Grazing Under Temperate And Semi-Arid Conditions, T Nolan, J Connolly, L M. Guillon, C Sall, K Dieye, K Dieye, H Guerin
Mixed Animal Species Grazing Under Temperate And Semi-Arid Conditions, T Nolan, J Connolly, L M. Guillon, C Sall, K Dieye, K Dieye, H Guerin
IGC Proceedings (1977-2023)
Mixed grazing has been practiced for a long time, under a variety of climatic conditions, combinations of animal species and grazing managements (Nolan and Connolly, 1977). They suggested that although mixed grazing research progress was impeded by difficulties associated with the increased number of variables involved it offered greater opportunity to improve resource use. The purpose of this paper is to present results from recent research carried out under temperate and semi-arid conditions related to individual animal and per unit area outputs, animal/vegetation relationships and complemetary patterns of grazing behavious in relation to more efficient and balanced use of vegetation …
The Influence Of Clothes On The Thermoregulatory Behavior And The Protection Against External Parasites Of Grazing Cattle, M Sakurai, A Yamada
The Influence Of Clothes On The Thermoregulatory Behavior And The Protection Against External Parasites Of Grazing Cattle, M Sakurai, A Yamada
IGC Proceedings (1977-2023)
Under the monsoon climate, maximum temperature showed 34 °C in August and minimum temperature showed - 15 °C in February, total rainfall amounting to 1.700 mm. Through the welfare of the grazing cattle, both hot, rain and frosty environment influence the animal production (Bennett et al., 1984; Done-Currie Jr et al., 1984; Fraser, 1983). In order to improve the welfare of grazing cattle under hot, cold, rain and attacks of the external parasites, the efficiency of cattle clothes were studied.
Comparison Of Energy Budget In Pastures By System Model: Intensively Managed Pasture Vs. Extensively Managed Pasture, M Shiyomi, N Koyama, M Tsuiki, K Ochiai, H Kobayashi, S Shioya, T Ami
Comparison Of Energy Budget In Pastures By System Model: Intensively Managed Pasture Vs. Extensively Managed Pasture, M Shiyomi, N Koyama, M Tsuiki, K Ochiai, H Kobayashi, S Shioya, T Ami
IGC Proceedings (1977-2023)
An annual gain of 1 ton cattle body weight per ha was attained in an intensively managed pasture (IMP) of the National Grassland research Institute, NGRI, in 1986. In this experiment the efficiency of solar energy converted into herbage and cattle body was not directly determined although seasonal changes in herbage and animal biomasses were measured. In current report, the energy budget for herbage and cattle body in this pasture was estimated and compared with that in an extensively managed pasture (EMP) using a system model.
Cattle Grazing Of Bahiagrass (Paspalum Notatum Flugge) Sward Canopy As Influenced By Dung Deposition, M Hirata, Y Sugimoto, M Ueno
Cattle Grazing Of Bahiagrass (Paspalum Notatum Flugge) Sward Canopy As Influenced By Dung Deposition, M Hirata, Y Sugimoto, M Ueno
IGC Proceedings (1977-2023)
It is commonly observed in a grazed pasture that the grazing animal rejects the herbage on and near the dung pat (Marsh and Campling, 1970). However, quantitative information on the dung-induced changes in herbage consumption is very limited. In this study, cattle grazing of the dung-deposited sward canopy is compared with that of the dung-free sward canopy in order to clear the cattle dung effect on the herbage consumption in a bahiagrass pasture.
Faeceal Recoveries Of The Alkanes Of Plant Cuticular Waxes In Penned And In Grazing Sheep, H Dove, R W. Mayes, M Freer, J B. Coombe, J Z. Foot
Faeceal Recoveries Of The Alkanes Of Plant Cuticular Waxes In Penned And In Grazing Sheep, H Dove, R W. Mayes, M Freer, J B. Coombe, J Z. Foot
IGC Proceedings (1977-2023)
The saturated odd-chain hydrocarbons (alkanes) of plant cuticular waxes, with chain lengths in the range C25-C35, can be used as internal markers for estimating herbage digestibility (Mayes and Lamb, 1984). In similar fashion, orally-administered even-chain alkanes (e.g. C23, C32 or C36) can be used to estimate faecal output (Mayes et al., 1986). These calculations, if done separately, require assumptions or information about the faecal recovery of alkanes. An alternative approach is to use one natural and one synthetic alkane, adjacent in chain length, to directly estimate herbage intake since, in this case, the incomplete recoveries have been shown to cancel …
Estimation Of Pasture Intake In Grazing Ewes, Using The Alkanes Of Plant Cuticular Waxes, H Dove, J Z. Foot, M Freer
Estimation Of Pasture Intake In Grazing Ewes, Using The Alkanes Of Plant Cuticular Waxes, H Dove, J Z. Foot, M Freer
IGC Proceedings (1977-2023)
Herbage intake in grazing animals is commonly estimated from faecal dry matter output, calculated from the dilution of orally-administered chromium sesquioxide (Cr203), and an in�� vitro estimate of herbage digestibility (e.g., Freer et al. 1988). A major disadvantage of this approach is that a single digestibility value is ultimately applied to all the animals in a group, despite the fact that both the level of intake of individual animals and the consumption of supplement can alter herbage digestibility (Waite et al. 1964). More recently, Mayes et al.(1986) obtained accrurate estimates of known herbage, from a combination of the faecal levels …
Dynamique De La Vegetation Dans Des Parcours Des Prealpes Du Sud De La France, O Senn
Dynamique De La Vegetation Dans Des Parcours Des Prealpes Du Sud De La France, O Senn
IGC Proceedings (1977-2023)
Une experimentation de revalorisation des terrains de parcours exige un suivi phyto-ecologique dans le but de preciser !'impact du paturage ovin sur la vegetation spontanee et !es modalites de son evolution. Ce suivi a ete effectue au sein d'exploitations agricoles situees dans !es Prealpes calcaires du sud de la France, entre 750 et 1000 m d'altitude ; la moyenne des precipitations annuelles varie de 700 a 1000 mm.
A Modified Linear Programming Method For Assesing The Effects Of Mixed Grazing In The Heterogenous Environments, J Connolly, T Nolan, L M. Guillon, C Sall, K Dieye, H Guerin
A Modified Linear Programming Method For Assesing The Effects Of Mixed Grazing In The Heterogenous Environments, J Connolly, T Nolan, L M. Guillon, C Sall, K Dieye, H Guerin
IGC Proceedings (1977-2023)
The aim of the programme of which this work is part is to investigate the role of mixed grazing in preservation of range vegetation and sustaining or improving animal production in the Senegalese Sahel. In this paper we apply the linear programming method of Connolly (1974) modified to allow for missing information, to data on animal preferences for plant species.
Intensive Continuous Dairy Cows Grazing Of An Heterogeneous Grassland: Botanical Evolution In Relation With The Animal Behavior, Anne Mathieu, B Leclerc, J L. Fiorelli, B Jeannin, B Hubert, E De Vaubernier
Intensive Continuous Dairy Cows Grazing Of An Heterogeneous Grassland: Botanical Evolution In Relation With The Animal Behavior, Anne Mathieu, B Leclerc, J L. Fiorelli, B Jeannin, B Hubert, E De Vaubernier
IGC Proceedings (1977-2023)
Intensive continuous grazing is now well established in temperate climate countries (Parker, 1987). In semi-continental climate, the adjustment of stocking rate to herbage growth is more complex (Mathieu and Jeannin, 1986). Moreover parcels are very often an assemblage of different types of permanent meadows. The question of animal behaviour in relation to this spatial heterogeneity, and the subsequent evolution of the pasture was posed. The perenniality of this grazing system is dependent on the trend of this evolution. An experimentation was carried out in the northeastern France (Mirecourt, Vosges) by INRA, in order to analyse spatial choices made by dairy …
Consommation Par Des Caprins De Quercus Ilex Et Quercus Pubescens Dans Un Taillis Mediterraneen, M C. Leouffre, E Lecrivain, B Leclerc
Consommation Par Des Caprins De Quercus Ilex Et Quercus Pubescens Dans Un Taillis Mediterraneen, M C. Leouffre, E Lecrivain, B Leclerc
IGC Proceedings (1977-2023)
Abandonnes depuis une cinquantaine d'annees, Jes massifs forestiers du sud-est de Ia France s'embroussaillent, Jes risques d'incendie augmentent alors que des eleveurs caprins a la recherche de ressources fourrageres pour !es troupeaux sont prets a utiliser ces milieux, done a participer a leur entretien. Afin de bien gerer l'espace et de controler )'impact des caprins, une etude a ete effectuee sur la consommation des deux principales especes ligneuses des taillis mediterraneens.
Composition Botanique Du Regime Alimentaire Des Bovins, Ovins Et Caprins Exploitant Des Parcours Naturels Et Agropastoraux Du Senegal, H Guerin, D Richard, D Froit, N Mbaye, C Sall
Composition Botanique Du Regime Alimentaire Des Bovins, Ovins Et Caprins Exploitant Des Parcours Naturels Et Agropastoraux Du Senegal, H Guerin, D Richard, D Froit, N Mbaye, C Sall
IGC Proceedings (1977-2023)
La description botanique du regime ingere par !es ruminants au paturage peut resulter de methodes tres precises de terrain (Bourbouze, 1980) et de laboratoire (Theurer et al, 1976) ou au contraire d'une approche qualitative consistant a classer !es especes en fonction de leur appetibilite. La methode conc;ue pour cette etude a une precision intermediaire. Elle visait a fournir rapidement des informations sur !'utilisation des fourrages de parcours naturels saheliens (Vindou Tiengoli - 200 ha) OU sahelo-soudaniens (Doli - 740 ha) clotures et de parcours agrospastoraux soudaniens (Thysse Kayemor-terroir de 10.000 ha environ) ou soudano-guineens (Kolda-terroir de 3.000 ha) (carte 1).
The Effect Of Cutting And Goat Grazing On The Structure And Function Of Maqui Rangelands In Israel, A Perevolotsky
The Effect Of Cutting And Goat Grazing On The Structure And Function Of Maqui Rangelands In Israel, A Perevolotsky
IGC Proceedings (1977-2023)
The Maqui, a vegetation form composed of evergreen shrubs and small trees with sclerophyllous leaves, dominates the Mediterranean Basin. In recent decades the Maqui ecosystem has been recovering from centuries of overexploitation and often develops into a dense thicket. Developing a proprer management scheme for the Maqui ecosystem has become, therefore, a challenge in many Mediterranean countries. Among the methods suggested to keep dense Maqui open and restore the balance· between the growing woody component and the herbaceous biomass, was the use of goats, which have gained fame as efficient browsers (e.g., Huss, 1971).
The Effect Of Grazing By Sheep And Kangaroos Upon The Survival Of Grasses In A Semi-Arid Woodland Of South Eastern Australia, A C. Grice
IGC Proceedings (1977-2023)
Since settlement by Europeans, the vegetation of the semiarid woodlands of south eastern Australia has undergone major changes. The change of greatest significance to pastoral industries has been the increase in woody species and the decline of endemic perennial grasses (Anon, 1969). One cause of change has been grazing by large numbers of sheep, the introduced rabbit and the increased populations of kangaroos (Wilson et al., 1984; Newsome, 1975). Grazing-induced changes have meant not only the reduction in a valuable forage component but reduced competition for small shrub seedlings and a lowered probability of fires that kill shrubs. (Harrington et …
Evolution Et Degradation D'Un Ecosysteme Pature En Zone Soudano-Guineenne Au Cameroun, G Rippstein
Evolution Et Degradation D'Un Ecosysteme Pature En Zone Soudano-Guineenne Au Cameroun, G Rippstein
IGC Proceedings (1977-2023)
L'Adamaoua est un vaste plateau situe en Afrique Centrale entre Jes 6° et 8° de latitude nord et Jes 10° et 16° de longitude est a des altitudes comprises entre 900 et I 500 m. Le climat y est soudanien avec une saison des pluies de 7 a 9 mois et I 600 a 1 800 mm de precipitation. Les observations foites en station ont montre des modifications relativement foibles de la contribution des especes et des biomasses avec Jes feux, le paturage, Jes chargements moderes, Jes systemes d'exploitation et Jes repos periodiques frequents (Rippstein, 1985). Nous rapportons ici Jes …
Human And Animal Impacts On Vegetation And Forage Plants In The Southern Guinea Savanna Of Nigeria, L C. Nwaigbo
Human And Animal Impacts On Vegetation And Forage Plants In The Southern Guinea Savanna Of Nigeria, L C. Nwaigbo
IGC Proceedings (1977-2023)
Human beings and animals interact with their habitat. This interaction changes the structure of the organization of communities of plants. The region that has been changed for worst with tress being replaced by grasses as a result of burning is the Savanna region of Nigeria. Annual fire is a common occurence in Nigerian Savanna and this ecological factor has altered the original vegetation of these areas. Burning is usually undertaken for clearing land for cultivation and also for production of a flush of fresh palatable grass for grazing by the nomadic cattle herdsmen. Forage plants like Afzelia africana, Pterocarpus erinaceus …
Utilisation Sylvopastorale De L'Espinal (Acacia Caven) Dans L'Aire Climatique Mediterraneenne Du Chili. Influence De L'Arbre Sur La Vegetation Pastorale, C Ovalle, J Avendano
Utilisation Sylvopastorale De L'Espinal (Acacia Caven) Dans L'Aire Climatique Mediterraneenne Du Chili. Influence De L'Arbre Sur La Vegetation Pastorale, C Ovalle, J Avendano
IGC Proceedings (1977-2023)
L'espinal constitue d'une strate ligneuse dominee par l'arbre autochtone, Acacia caven, et d'une strate herbacee dominee par ��es therophytes d'origine circummediterraneenne, est la formation vegetale pastorale d'importance economique majeure du Chili mediterraneen. L'amelioration pastorale de l'espinal, du fait de la presence simultanee des deux strates de vegetation, se heurte toujours a la question de la place, de !'utilisation ou du role d' Acacia caven par rapport a la strate herbacee dans le systeme ecologique complexe. Une premiere partie des resultats sur !'influence de l'arbre a ete presentee par Ovalle (1986) et Ovalle et Avendano (1987). Cette contribution ajoute des resultats …
Grazing Pressure By Sheep: Consequences For Pasture Stability In An Australian Mulga Woodland, K C. Hodgkinson, J W. Terpstra
Grazing Pressure By Sheep: Consequences For Pasture Stability In An Australian Mulga Woodland, K C. Hodgkinson, J W. Terpstra
IGC Proceedings (1977-2023)
The mulga woodlands are an extensive (1.6 km2) native pasture type in semi-arid and arid Australia and mainly utilised for wool production (merino sheep). The dominant shrub/treee species is mulga (Acacia aneura) which usually occurs in groves across slopes. Pastures comprise perennial grasses and ephemeral forbs. Continuous grazing by sheep and cattle and fire suppression has led to widespread degradation of these pastures; perennial grasses have diminished in abundance and been replaced by ephemeral forbs and inedible shrubs. This paper reports the grazing pressure on Thryridolepis mitchelliana (a perennial grass ubiquitous in mulga woodlands but commonly diminished in abundance) …