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Articles 1 - 14 of 14
Full-Text Articles in Physical Sciences and Mathematics
Grazing Management Of Tagasaste (Chamaecytisus Proliferus) For Sheep And Cattle Production In Southern Australia, N J. Edwards, G M. Allen, D M. Mcneill, C M. Oldham
Grazing Management Of Tagasaste (Chamaecytisus Proliferus) For Sheep And Cattle Production In Southern Australia, N J. Edwards, G M. Allen, D M. Mcneill, C M. Oldham
IGC Proceedings (1997-2023)
Direct grazing of hedgerows of tagasaste (Chamaecytisus proliferus) by sheep or cattle appear to be very robust systems. Tagasaste persists under a continuous grazing regime with cattle such that plant regrowth maintained between 5 and 10 cm in length produces in excess of 215 kg of animal liveweight/ha/year. This level of production is also sustained within a rotational grazing regime. Under both grazing systems cattle production within a year is highly seasonal, with liveweight gains from young cattle peaking at 1.0-1.5 kg/head/day in winter and spring, but dropping to maintenance only by late summer-autumn. Sheep, like cattle, can …
Scale Of Patchiness Affects The Relation Between Forage Quality And Patch Choice By Cattle, Wallis Devries, M F. Laca, E A. Laca
Scale Of Patchiness Affects The Relation Between Forage Quality And Patch Choice By Cattle, Wallis Devries, M F. Laca, E A. Laca
IGC Proceedings (1997-2023)
We predicted and tested the effects of scale of heterogeneity on movements and selectivity of a large grazer in a controlled field experiment. We created random mosaics of short/high quality and tall/low quality grass patches in equal proportion at grid sizes of 2x2 m and 5x5 m. Subsequently, we monitored the foraging behavior of four steers in 16 20x40 m plots over 30-minute periods. As predicted, the animals selected the short patches both by walking in a nonrandom manner and by concentrating their grazing time. Selectivity was more pronounced in large patches than in small ones. In contrast, the number …
Characterization Of Grazing Patterns In Cool-Season Annual And Warm-Season Perennial Grass Pastures, G E. Aiken, M S. West, D I. Bransby
Characterization Of Grazing Patterns In Cool-Season Annual And Warm-Season Perennial Grass Pastures, G E. Aiken, M S. West, D I. Bransby
IGC Proceedings (1997-2023)
Pastures are often either under- or over-grazed, which can affect both pasture sustainability and livestock performance. Disk meter heights were measured for rye (Secale cereale L.) -ryegrass (Lolium L. multiflorum Lam.) pasture to characterize stocking rate (2.5, 3.7, and 4.9 steers/ha) effects on grazing patterns. In another study, grazing indices were calculated for bermudagrass [Cynodon dactylon (L.) Pers.] to describe pasture utilization over time for three stocking rates (3.0, 5.9, 8.9 steers/ha). Distributions of DMH for rye-ryegrass showed distinct grazing patterns for each stocking rate, with the distributions changing from bimodal to multi-modal from heavy to light …
Shade For Cattle On Pasture: A Guide For Ontario Producers, E J. Finegan, T M. Widowski
Shade For Cattle On Pasture: A Guide For Ontario Producers, E J. Finegan, T M. Widowski
IGC Proceedings (1997-2023)
In tropical climates, adequate shade may be essential to ensure the survival and productivity of grazing animals, but in the temperate Ontario climate, the necessity or benefits of providing shade for grazing cattle are less clear, and have proved controversial. Meteorological data indicate that beef cattle in Ontario may be at risk of suffering from heat stress on more than 25% of days during July and August, and may decrease feed intake and benefit from the provision of shade for more than 50% of days during the two hottest summer months. A booklet, entitled ‘Beat the Heat. A Guide …
How Do Cattle And Sheep Alter Ingestive Behaviour In Response To Changes In Sward State?, P D. Penning, R J. Orr, A J. Parsons, A Harvey
How Do Cattle And Sheep Alter Ingestive Behaviour In Response To Changes In Sward State?, P D. Penning, R J. Orr, A J. Parsons, A Harvey
IGC Proceedings (1997-2023)
Ingestive behaviour of yearling Friesian heifers continuously stocked on monocultures of Lolium perenne (G) or Trifolium repens (C) maintained at sward heights of 7-8 cm, was recorded. Bite masses, prehension biting and mastication rates were similar between treatments (211 vs. 230 mg DM prehension bite-1, 61 vs. 55 prehension bites and 11 vs. 13 mastications, min-1 for G and C, respectively). DM intake rates were 12.9 g min-1 for both treatments. Animals grazed longer (536 vs.436 min) and ruminated longer (526 vs. 267 min-1) on G compared with C. Daily intakes were 6.9 vs.5.6 kg DM for G and C. …
High Instantaneous Spring Stocking Rates To Improve Year Round Herbage Utilization In Argentine Dairy Production, M H. Wade, D E. Dalla Valle
High Instantaneous Spring Stocking Rates To Improve Year Round Herbage Utilization In Argentine Dairy Production, M H. Wade, D E. Dalla Valle
IGC Proceedings (1997-2023)
In much of Buenos Aires Province, Argentina 60% of the year’s pasture production occurs during spring. This trial was carried out to test the minimum area necessary for grazing in the period of maximum pasture growth in the 3 to 4 months of spring, so that in turn the maximum potential area for forage conservation could be estimated. At the two levels of herbage allowance aimed for (achieving 18.1 and 36.6 kgDM/cow/d), herbage intake was 11.1 and 13.4 kgDM/cow/d and milk production 20.9 and 22.3 l/cow/d respectively. While these differences were not significant, the trial demonstrated a potential of 70 …
The Effect Of Sward Height And Bulk Density On Herbage Intake And Grazing Behaviour Of Dairy Cows, C S. Mayne, D Mcgilloway, A Cushnahan, A S. Laidlaw
The Effect Of Sward Height And Bulk Density On Herbage Intake And Grazing Behaviour Of Dairy Cows, C S. Mayne, D Mcgilloway, A Cushnahan, A S. Laidlaw
IGC Proceedings (1997-2023)
The effects of sward height and bulk density on herbage intake and grazing behaviour of dairy cows during 1 hour grazing periods was investigated. Sward factors had a marked effect on dry matter (DM) intake/bite, which ranged from 0.4 to 1.1 g, and this was reflected in hourly intake rates. Intake/bite was largely influenced by sward height, reflecting increased bite depth in taller swards, with inherent differences between swards at low sward heights largely attributable to differences in bulk density (BD). The results indicate that DM intake rates up to 4.0 kg DM/hour can be achieved in short term grazing …
Characterization And Management Of Grassland And Associated Plant Communities On Kodiak Island, Alaska, J David Swanson, M.H. W. Barker
Characterization And Management Of Grassland And Associated Plant Communities On Kodiak Island, Alaska, J David Swanson, M.H. W. Barker
IGC Proceedings (1997-2023)
A range survey on Kodiak Island grazing leases was conducted summers of 1995-96 to update management plans for areas grazed by cattle (Bos tarus) and bison (Bison bison). Ecological site (site) mapping and descriptions were updated, ecological status and grazing use was evaluated. Spatial data were acquired and summarized using Geographic Information System (GIS). New sites were developed for beaches and cliffs to facilitate ecosystem planning and enhance GIS capabilities.
Research Programme To Improve The Utilization Of Home-Grown Forages In The Netherlands, A.M. Van Vuuren, A H. Bosma, G J. Kaspers, J.J. M.H. Ketelaars, E.N. Van Loo, H J.P. Marvin, H Valk, G.W.J. Van De Ven
Research Programme To Improve The Utilization Of Home-Grown Forages In The Netherlands, A.M. Van Vuuren, A H. Bosma, G J. Kaspers, J.J. M.H. Ketelaars, E.N. Van Loo, H J.P. Marvin, H Valk, G.W.J. Van De Ven
IGC Proceedings (1997-2023)
In The Netherlands a research programme has been initiated by the Ministry of Agriculture, Nature Management and Fisheries to increase the proportion of high-quality home-grown forage in rations for dairy cows. This should result in a more sustainable dairy husbandry by improving the efficiency of utilization of nitrogen and phosphorus from home-grown forages (mainly grass and maize) on farm level. Research disciplines involved are plant breeding, forage harvesting and conservation and nutrition.
An Assessment Of Young Cattle Behaviour And Welfare In A Virtual Fencing System, C. Holohan, A. Gordon, R. Palme, S. Buijs, F. Lively
An Assessment Of Young Cattle Behaviour And Welfare In A Virtual Fencing System, C. Holohan, A. Gordon, R. Palme, S. Buijs, F. Lively
IGC Proceedings (1997-2023)
Virtual fencing is a novel technology which uses a combination of audio and electrical stimuli to contain grazing livestock within a GPS boundary. There are however some concerns around the use of such a technology and its potential effects on the behaviour and welfare of animals. To investigate this, 64 dairy-origin calves were assigned to one of two treatments in a randomised complete block design, with 4 groups of 8 calves per treatment. The two treatments were virtual fencing (VF) and electric fencing (EF). The experimental period lasted 31 days in total, consisting of a 10 day training period and …
Public Policies For The Development Of A Sustainable, Forage-Based Cattle Sector In Colombia, Argentina, And Costa Rica: A Comparative Analysis, S. Burkart, M. Diaz, Moreno Lerma
Public Policies For The Development Of A Sustainable, Forage-Based Cattle Sector In Colombia, Argentina, And Costa Rica: A Comparative Analysis, S. Burkart, M. Diaz, Moreno Lerma
IGC Proceedings (1997-2023)
Projected increases in global food demand highlight the importance of Latin America as one of the major future food suppliers, particularly regarding animal-source foods such as beef or milk. Despite the importance of the cattle sector for the region, its negative environmental impacts are numerous and the shift towards sustainability is perceived as slow and uncoordinated. This study aims to identify achievements and difficulties in the implementation of public policies for a sustainable cattle sector in Colombia, Argentina, and Costa Rica, for which policies focused on the use of silvo-pastoral systems and forage-based solutions are prioritized. Based on the review …
Bale Grazing To Improve Soil Fertility In Kentucky Pastures, N. Roy, J. W. Lehmkuhler
Bale Grazing To Improve Soil Fertility In Kentucky Pastures, N. Roy, J. W. Lehmkuhler
IGC Proceedings (1997-2023)
A long-term project on a small Kentucky beef farm has demonstrated that bale grazing is an effective means of improving soil fertility. With the cooperation of a beef cattle producer, Extension personnel have been able to measure improvements in soil fertility using both high density and moderate density bale grazing practices. Initial efforts demonstrate that high density bale grazing improved soil fertility quickly by increasing soil test phosphorus from 15 to 45 ppm and potassium from 52 to 175 ppm on Melich III soil test extraction method. High density bale grazing was also shown to serve as a strategy to …
Economic Benefits Of Sustainable, Forage-Based Cattle Systems In Colombia And Nicaragua, S. Burkart, K. Enciso, M. Diaz, R. Van Der Hoek
Economic Benefits Of Sustainable, Forage-Based Cattle Systems In Colombia And Nicaragua, S. Burkart, K. Enciso, M. Diaz, R. Van Der Hoek
IGC Proceedings (1997-2023)
Forage-based cattle systems play a key role in rural economies of developing countries in terms of food security and poverty alleviation, particularly in tropical Latin America. However, they are often related to being a major cause of negative environmental impacts by contributing to increased greenhouse gas emissions, land degradation, and the reduction of biodiversity. Significant resources have been allocated to research and development in forage material improvement, including selection and breeding. A broad range of improved materials were released by private and public sector actors showing superior characteristics in terms of productivity and environmental impacts compared to native or naturalized …
A Comparison Of Four Methods Of Botanical Analysis In Kentucky Cattle Pastures, Echo Elizabeth Gotsick, S. Ray Smith, Jimmy C. Henning, Christopher D. Teutsch
A Comparison Of Four Methods Of Botanical Analysis In Kentucky Cattle Pastures, Echo Elizabeth Gotsick, S. Ray Smith, Jimmy C. Henning, Christopher D. Teutsch
IGC Proceedings (1997-2023)
Throughout the many decades of grassland and forage research, practitioners have used many different methods to assess botanical composition. While a few of these methods have proven to be accurate and efficient, there has been limited direct comparison between methods. The objective of this study was to determine an accurate and efficient method to determine botanical composition for researchers, practitioners, and students. Six farms with two pastures each were monitored across the state of Kentucky. Sampling started fall 2020 and continued through fall 2022 with measurements taken three times a year using the following measurement techniques: step point, visual estimation, …