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Articles 121 - 150 of 388
Full-Text Articles in Plant Pathology
Effects Of Grazing And Mowing On Leymus Chinensis Grassland In The Songnen Plain Of Northeastern China, R Z. Wang, E A. Ripley
Effects Of Grazing And Mowing On Leymus Chinensis Grassland In The Songnen Plain Of Northeastern China, R Z. Wang, E A. Ripley
IGC Proceedings (1977-2023)
Effects of mowing and grazing on a Leymus chinensis grassland in the Songnen plain of northeastern China were studied using eight replicates of four grazing and mowing treatments. Canopy cover and biomass of the dominant species (L. chinensis) were lower, and cover of the halophyte Suaeda corniculata higher, on grazed than ungrazed; ungrazed plots showed a response to mowing, but not grazing; species diversity increased with grazing and mowing. This study found dissimilar effects of grazing and mowing on plant populations, canopy biomass and structure in L. chinensis grassland. Possible interactions between the principal disturbances on the grassland are …
Productivity Of Pasture Consisting Of Both Unimproved And Improved Areas In Aso Region Of Kyushu District, C Okamoto, K Kabata, K Tsuji, M Kikuchi
Productivity Of Pasture Consisting Of Both Unimproved And Improved Areas In Aso Region Of Kyushu District, C Okamoto, K Kabata, K Tsuji, M Kikuchi
IGC Proceedings (1977-2023)
Productivity of pasture consisting of both unimproved and improved areas was investigated in terms of conversion efficiency of solar energy into products and nutrient intake of animal. It was shown that animal production is mainly supported by the improved area in spring and late-autumn while the production is supported together by both areas in summer by reasons of increases in productivity of the unimproved area and productive depression in the improved area. CP/DE balance of grazed herbage was close to the requirement ofthe animal in the case where the unimproved area was grazed with the improved area rather than in …
Manipulation Of Botanical Composition Of Native Pastures By Grazing In Temperate South-East Australia, D L. Garden, D A. Friend, P M. Dowling, G M. Lodge
Manipulation Of Botanical Composition Of Native Pastures By Grazing In Temperate South-East Australia, D L. Garden, D A. Friend, P M. Dowling, G M. Lodge
IGC Proceedings (1977-2023)
Historical evidence indicates that substantial changes have occurred in the botanical composition of native pastures in temperate southeast Australia as a result of grazing by sheep and cattle. However, the resulting pastures now appear to be relatively stable and there has been limited success in changing composition experimentally. This paper reports the results of experiments conducted at four locations in south-east Australia designed to increase the proportion of desirable species in native pastures by grazing management.
Disturbance By Mechanical Phosphorous Fertilization On The Cover And Biomass Of Humid Alkaline Communities Of The Flooding Pampa (Argentina), O E. Ansin, E M. Oyhamburu, J L. Delgado Caffe
Disturbance By Mechanical Phosphorous Fertilization On The Cover And Biomass Of Humid Alkaline Communities Of The Flooding Pampa (Argentina), O E. Ansin, E M. Oyhamburu, J L. Delgado Caffe
IGC Proceedings (1977-2023)
Experiments were carried out in order to evaluate the impact of mechanical perturbations, phosphorous fertilization and grazing on the native grasslands. Six treatments were tested: three without grazing and three subjected to grazing. Both situations were plowed, plowed plus fertilization or kept untreated. During the study botanical composition, vegetative cover, species diversity and above ground biomass were measured. Plowed and plowed plus fertilization treatments drastically reduce all of these parameters related to community structure and forage production. These figures contrasted with the non-perturbated treatments, were values did not change significantly from the original state. Mechanical perturbations provoked reductions on grassland …
Effect Of Cattle Grazing On The Aridity Level Of Humid Halomorphic Grass Communities Of The Flooding Pampa (Argentina), O E. Ansin, V A. Deregibus
Effect Of Cattle Grazing On The Aridity Level Of Humid Halomorphic Grass Communities Of The Flooding Pampa (Argentina), O E. Ansin, V A. Deregibus
IGC Proceedings (1977-2023)
The Argentine Flooding Pampa is a large humid rangeland, severely deteriorated by cattle grazing, to the point of causing the local extinction of many native grasses and important alterations in ecosystem function. Among grassland communities exist those that vegetate halomorphic soils, highly degraded due continuous grazing by domestic herbivores causing soil denudation and increased aridity. An alternate grazing method, that controls the periodicity and moment of important rest periods followed by disturbance events, should increase cover and favor water availability. This succession process will determine more vigorous and abundant foraging species in the degraded communities. After six years of controlled …
Proximity Of Water Affects Grazing Distribution And Soil Nutrient Cycling, J R. Gerrish, P R. Peterson, F A. Martz
Proximity Of Water Affects Grazing Distribution And Soil Nutrient Cycling, J R. Gerrish, P R. Peterson, F A. Martz
IGC Proceedings (1977-2023)
A three-year study was conducted to quantify the effects of travel distance to water on pasture utilization rate and soil nutrient gradients. A 64 ha unit was divided into 16 4 ha pastures having maximum travel distances ranging from 250 to 450 m. Temporal utilization rate (UR) and soil nutrient levels were determined at 30 m intervals beginning at the water source. Temporal UR significantly declined beyond 250 m in all pastures having travel distances exceeding 250 m while pastures with less than 250 m travel distance were uniformly grazed. Increased nutrient level gradients beginning within 60 m of water …
Can Forages Reduce Nitrate Leaching Losses From Mixed Cropping Rotations In New Zealand?, G S. Francis, K M. Bartley, F J. Tabley
Can Forages Reduce Nitrate Leaching Losses From Mixed Cropping Rotations In New Zealand?, G S. Francis, K M. Bartley, F J. Tabley
IGC Proceedings (1977-2023)
The objective of this two-year experiment was to determine the ability of forages grown as winter cover crops to reduce nitrate leaching losses after temporary leguminous pastures were ploughed. In both years, cover crops reduced cumulative leaching losses compared with bare fallow and were most effective when sown early in the autumn. When large amounts of residues with relatively low N concentrations were incorporated in the soil in the spring, there was extensive net N immobilisation that suppressed the yield of the following wheat test crop. When cover crops were grazed, the N consumed by sheep as herbage was returned …
Nitrogen Leaching From Dairy Pastures In The Northeast United States, W L. Stout, G F. Elwinger, S L. Fales, L D. Muller, R R. Schnabel, W E. Priddy
Nitrogen Leaching From Dairy Pastures In The Northeast United States, W L. Stout, G F. Elwinger, S L. Fales, L D. Muller, R R. Schnabel, W E. Priddy
IGC Proceedings (1977-2023)
While intensive grazing has the potential to increase dairy farm profitability in the Northeast United States, the uneven recycling of N through feces and urine can increase NO3 - leaching. We measured NO3 - leaching loss from urine and feces beneath N-fertilized orchardgrass using 60 cm diameter by 90 cm deep drainage lysimeters. Mean NO3-N levels in leachate beneath these areas were 3.8, 6.5, 93.5, 110 and 139 mg l-1 for the control, feces, and spring, summer and fall applied urine. Extrapolation of the leaching data over a grazed landscape indicates that a grazing intensity for a 180-day grazing season …
Participative Management And Rehabilitation Of The Village Common Pastures In The Central Highlands Of Turkey: Importance Of Diagnostic Surveys In Project Planning And Execution, H K. Firincioglu, S Christiansen, S Unal, D Ozturk, H Basaran
Participative Management And Rehabilitation Of The Village Common Pastures In The Central Highlands Of Turkey: Importance Of Diagnostic Surveys In Project Planning And Execution, H K. Firincioglu, S Christiansen, S Unal, D Ozturk, H Basaran
IGC Proceedings (1977-2023)
Most of the pastures in the central highlands of Turkey have been replaced by cereal production over the last 50 years. Also, the mismanagement of the existing pastures, i.e., early grazing and over stocking of animals, has resulted in severe degradation of pasture species. A study, involving a multidisciplinary approach, was initiated and included botanical and socio-economic surveys, improvement of village-based feed resources, and realistic livestock feeding schemes to put limited feed resources to best use. Results of socioeconomic survey studies in selected villages are presented as prerequisite information for initiation of a forage, livestock and range rehabilitation project.
Use Of Grazing Animals In Re-Seeding Degraded Marginal Lands In Northern Syria, F Ghassali, A E. Osman, P S. Cocks
Use Of Grazing Animals In Re-Seeding Degraded Marginal Lands In Northern Syria, F Ghassali, A E. Osman, P S. Cocks
IGC Proceedings (1977-2023)
Seed mixture of sixteen native legumes were fed to sheep as a single meal and their passage through the animals was monitored in the faeces. The same mixture was used in a field experiment to improve degraded pasture. Over two hundred sheep were allowed to graze the improved pasture and rest on a nearby un-improved (target) pasture during four days. Results showed that legumes with smaller seeds were able to pass through the animals undamaged compared with large seeded species. The field study provided confirmation of the animal feeding study and provided evidence that grazing animals can help in rehabilitation …
Structure, Productivity And Animal Utilization In A Communal Pasture In The Basque Country (Northern Spain), I Albizu, G Besga, M Rodriquez, M Onaindia, M Domingo, I Amezaga
Structure, Productivity And Animal Utilization In A Communal Pasture In The Basque Country (Northern Spain), I Albizu, G Besga, M Rodriquez, M Onaindia, M Domingo, I Amezaga
IGC Proceedings (1977-2023)
The goal of this study was to determine the structure, productivity and utilization of mountain communal pastures of the Gorbea area in 1994. The area was classified in four zones according to topographic position and improvement activities: north slope brush removed, summit, south slope 50% brush, and south slope brush removed. Ecological profiles were used to relate the most abundant species to soil P and K contents at the different zones. Exclosure cages were used to estimate potential productivity, botanical composition and pasture utilization. Soil P and K contents are the parameters that relate best to floristic composition, being Agrostis …
Mineral Composition Of Perennial Pasture Species Grazed By Dairy Cows In South-Eastern Australia, P T. Doyle, C R. Stockdale, W J. Wales
Mineral Composition Of Perennial Pasture Species Grazed By Dairy Cows In South-Eastern Australia, P T. Doyle, C R. Stockdale, W J. Wales
IGC Proceedings (1977-2023)
On four occasions, the mineral composition of white clover (Trifolium repens L.), perennial ryegrass (Lolium perenne L.) and paspalum (Paspalum dilatatum Poir.), and their morphological components, were monitored as they regrew after defoliation. The four periods coincided with spring, summer, summer/autumn and autumn. White clover generally had more phosphorus, potassium, calcium and magnesium than did the grasses. Ryegrass, on the other hand, had higher concentrations of sodium than either white clover or paspalum. When compared with requirements for lactating dairy cows, it appeared that phosphorus was the major mineral in the pasture on offer with potential to adversely …
Herbage Quality At Continuous Grazing With Dairy Cows At Different N-Intakes And Sward Types, K Soegaard, O Aaes
Herbage Quality At Continuous Grazing With Dairy Cows At Different N-Intakes And Sward Types, K Soegaard, O Aaes
IGC Proceedings (1977-2023)
Herbage quality was examined in paddocks continuously grazed by dairy cows fed supplements with low and high N. There were two sward types for each level of supplement, i.e. fertilized perennial ryegrass (Lolium perenne L) and unfertilized perennial ryegrass/white clover (Trifolium repens L) with a mean clover content of 49 % of dry matter. Decreasing N-intake from 307 to 140 g N cow -1 d -1 by feeding low-N supplements had a small influence on herbage quality in spite of the reduced N-output via urine and faeces. Variation in herbage quality was large during the growing season. The fibre concentration …
Performance Of Grazing Bull Calves Supplemented With Increasing Levels Of Ruminally Undegradable Portein, J R. Kawas, O Osmin, J Hernandez, R Leal, F Garza, J L. Danelon
Performance Of Grazing Bull Calves Supplemented With Increasing Levels Of Ruminally Undegradable Portein, J R. Kawas, O Osmin, J Hernandez, R Leal, F Garza, J L. Danelon
IGC Proceedings (1977-2023)
The objective of this study was to determine the effect of increasing levels of ruminally undegradable protein (ECP) on the performance of bull calves grazing Coastcross-1 Bermudagrass during the dry season. One hundred and twelve Zebu-Brown Swiss bull calves weighing an average of 265 kg, were randomly assigned to four treatment groups in a completely random design. Calves received a self-feeding supplement (1 kg) with 40% crude protein (CP) and 31, 38, 44, or 52% ECP. During a 96-day preliminary phase without supplementation, weight gains of the four treatment groups ranged from 0.357 to 0.394 kg/day. A linear (P<0.0 I) response of calf weight gain was observed with an increase in ECP of the supplement (0.668, 0.672, 0.823 and 0.893 kg/day, respectively). Plasma urea concentration was reduced (P<0.05) from 17.8 to 9.85 mg/di with the highest level ofECP, which may reflect a reduced supply of NH -N for ruminal bacteria.
Protein Degradability Effect And Supplementation Level On Pasture Utilization, A.V M. Franco, P De Andrade, G L. Franco
Protein Degradability Effect And Supplementation Level On Pasture Utilization, A.V M. Franco, P De Andrade, G L. Franco
IGC Proceedings (1977-2023)
The objective was to determine the effect of protein degradability and supplement level on forage degradation. Steers fistulated were utilizated in brachiaria (Brachiaria brizantha) pasture. A randomized block design was used with a control treatment and supplements according to a factorial scheme combining low, medium and high protein degradability with supplementation levels: low, medium and high analysed as principal treatments and incubation time as splitplot by SAS. Nylon bags were incubated at 4; 8; 12; 24; 48; 72; 96 and 120 hours to determine DM, CP and NDF degradation. There was no effect (P>0.05) of protein degradability …
Agronomy Of Lathyrus Species In South Australia, M S. Miyan, W D. Bellotti, P D. Carpenter
Agronomy Of Lathyrus Species In South Australia, M S. Miyan, W D. Bellotti, P D. Carpenter
IGC Proceedings (1977-2023)
Agronomic studies on Lathyrus sativus and L. cicera, promising forage and/or grain legumes, are presented. Time of seeding, seeding rate and grain recovery following grazing were investigated in preparation for the release of the first Australian commercial cultivars of Lathyrus. Clear optimal seeding rate, time of seeding, and guidelines for grazing have been identified. A seeding rate of 45-60 kg/ha and an early sowing time (June 6 in this experiment) were identified for maximum grain yield. Grain yield following grazing can be equal to ungrazed crops although sufficient time between grazing and flowering is required to ensure adequate grain yields. …
Effect Of Grazing And Soils On The Structure Of Mountain Vegetation Communities, I Alonso
Effect Of Grazing And Soils On The Structure Of Mountain Vegetation Communities, I Alonso
IGC Proceedings (1977-2023)
The range of life forms of four grassland communities in the Cantabrian mountains (N. Spain) was studied under grazing and when grazing was excluded in relation to soil characteristics. Hemicryptophytes were the most abundant life form in all communities and they increased their number when ungrazed. Diversity was bigger in the communities with shrubs, which presented a more heterogeneous structure. As a whole, grasslands on calcareous soils were more diverse than those on siliceous soils.
Mineral Contents Of White Clover Grass And Nitrogen Fertilized Grass Pastures For Lambs, R Sormunen-Cristian, P Nykänen-Kurki, J Peltola
Mineral Contents Of White Clover Grass And Nitrogen Fertilized Grass Pastures For Lambs, R Sormunen-Cristian, P Nykänen-Kurki, J Peltola
IGC Proceedings (1977-2023)
The mineral contents (Ca, P, Mg, K, Na, Fe, Cu, Zn, and Mn) of white clover grass without nitrogen and grass-only pastures with annual nitrogen rates of 0, 120 and 250 kg ha-1 were studied in 1994 and 1995. The pastures were grazed twice per season by growing lambs. The white clover contents averaged 25% and 42%, respectively. The Ca and Mg contents and the Ca/P ratio were higher, and the K/(Ca+Mg) equivalent ratio lower in white clover grass than in grass-only swards. The P content of white clover grass was similar to that of grass, and the K content …
The Effect Of Ryegrass Endophyte On Milk Production From Dairy Cows In Northern New Zealand, E R. Thom, D A. Clark, C D. Waugh, R J. Mccabe, V T. Van Vught, B.J L. Kock
The Effect Of Ryegrass Endophyte On Milk Production From Dairy Cows In Northern New Zealand, E R. Thom, D A. Clark, C D. Waugh, R J. Mccabe, V T. Van Vught, B.J L. Kock
IGC Proceedings (1977-2023)
The aim of this study was to compare the milk production of cows grazing endophyte-infected perennial ryegrass (Lolium perenne L.) pasture with those grazing endophyte-free pastures. High and nil endophyte ryegrass pastures were drilled with and without white clover (Trifolium repens L.) in autumn 1993. White clover was completely removed in autumn 1995. High endophyte pastures had >85% of tillers infected but nil endophyte pastures were rapidly contaminated with endophyte-infected ryegrass and had 50% infection by autumn 1996. Losses in milk production due to endophyte were small (<6%), and occurred in only 2 of the 6 three week test periods. Cows showed clinical symptoms of ryegrass staggers in summer/autumn 1995 but not in 1996. Heat stress symptoms were absent. Losses of milk production occurred when lolitrem B levels were low (spring 1994) and when cows did not show clinical staggers (summer 1996). Other chemicals or agronomic factors could be important determinants of the milk production responses.
Spring Grazing To Manipulate The Composition Of A Re-Created Species Rich Grassland Habitat, R Chapman, A Younger
Spring Grazing To Manipulate The Composition Of A Re-Created Species Rich Grassland Habitat, R Chapman, A Younger
IGC Proceedings (1977-2023)
Botanical diversity in species rich grasslands re-created on restored opencast coal sites may be threatened by aggressive growth from the legume component. A previous study indicated that this aggressive legume growth may be suppressed by spring grazing with sheep. A detailed study was conducted to determine the effect of spring grazing on the two most abundant legumes within the community; white clover (Trifolium repens) and lesser trefoil (Trifolium dubium). The results obtained suggested that the control of legumes was apparently mediated principally through the suppression of white clover, with lesser trefoil growth actually being increased by …
Phyllochron Development In Cool-Season Forage Grasses, A B. Frank, J D. Berdahl, J F. Karn
Phyllochron Development In Cool-Season Forage Grasses, A B. Frank, J D. Berdahl, J F. Karn
IGC Proceedings (1977-2023)
The purpose of this study was to evaluate the relationship between grass leaf insertion rate and accumulated growing degree-days, and determine the phyllochron for five perennial forage grass species and two cultivars of each species. Species field seeded in solid stands were crested wheatgrass [Agropyron desertorum (Fisch. ex. Link) Schult.], intermediate wheatgrass, [Thinopyrum intermedium Barkw. & Dewey:Syn:A. intermedium (Host) Brauv], western wheatgrass [Pascopyrum smithii (Rybd) L ve], green needlegrass (Stipa viridula Trin.), and smooth bromegrass (Bromus inermis Leyss). Species phyllochron differences ranged from 77 GDD for Mandan 404 smooth bromegrass to 114 GDD for Lodorm …
The Analysis Of Dynamic Interaction In Legume Binary Mixture Under Controlled Conditions Of Irrigation And Clipping, M S. Vrahnakis, B Noitsakis, Z Koukoura
The Analysis Of Dynamic Interaction In Legume Binary Mixture Under Controlled Conditions Of Irrigation And Clipping, M S. Vrahnakis, B Noitsakis, Z Koukoura
IGC Proceedings (1977-2023)
The objective of this study was to analyse the type of interference that occurred between the annual legume species, purple clover (Trifolium purpureum L.) and narrow leaved crimson clover (Trifolium angustifolium Loisel. ), growing in mixed conditions under two different watering regimes and two different clipping treatments. A replacement series experiment was conducted in pots placed in the field. The above ground biomass (gr/plant) were measured. The recently proposed Inverse Linear Model was implied in order to analyse the competitive interaction between the above species. The results suggest that Tr. purpureum was the superior competitor to Tr. angustifolium …
Soil Nutrient Redistribution Pattern About The Tree In A Silvopastoral System, L C. Nwaigbo, H G. Miller, A R. Sibbald, G Hudson
Soil Nutrient Redistribution Pattern About The Tree In A Silvopastoral System, L C. Nwaigbo, H G. Miller, A R. Sibbald, G Hudson
IGC Proceedings (1977-2023)
The objective of this paper is to report the effect of animal-tree interactions on soil nutrient redistribution pattern in a grazed silvopastoral experiment site at Glensaugh, in NE Scotland. Scots pine (Pinus sylvestris L) tree species were planted in square lattice arrangements at 5 m x 5 m, spacing (400 stems/ha) on plots replicated over three blocks in Randomized Complete Block design on a predominantly rye grass (Lolium perenne L) pasture which was grazed by sheep yearly from April to October. Included in the design were grazed pasture plots without trees (Control). Soil samples were collected from around …
Trees For Shelter: The Implications In Agroforestry System, L C. Nwaigbo, A R. Sibbald, G Hudson
Trees For Shelter: The Implications In Agroforestry System, L C. Nwaigbo, A R. Sibbald, G Hudson
IGC Proceedings (1977-2023)
The objective of this study was to determine the horizontal and vertical variations in soil penetration resistance (PR) observed at tree-scale in silvopastoral plots that were grazed by sheep with and without trees. Sycamore trees (Acer pseudoplatanus L) were planted in the spring of 1988 at 10 m x 10 m spacing (100 stems/ha) at Glensaugh NE of Scotland on plots replicated over three blocks in Randomized Complete Block design on a predominantly rye grass (Lolium perenne L) pasture. Included in the design were pasture plots without trees (Control). The experiment is grazed by sheep yearly from April to …
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 (1977-2023)
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 …
Behaviour Of Cattle On Two Different Types Of Upland Pastures, D Macesic, M Knezevic
Behaviour Of Cattle On Two Different Types Of Upland Pastures, D Macesic, M Knezevic
IGC Proceedings (1977-2023)
The purpose of this research was to study the influence of the quality of pastures on the behaviour of cows in a 'cow-calf' system. The behaviour was measured by the four principal activities of the herd: grazing, lying, 'roaming' and insect repelling, and it is presented with relative indicators. The trial was conducted on pasture areas of the Faculty of Agriculture, University of Zagreb, at the altitude of 650- 850 m. The influence of the pasture quality on the behaviour of cattle on pasture was studied on two different types of pastures: a natural unreclaimed pasture belonging to the Arrhenatheretum …
Foraging Behaviour Of Heifers, Sheep And Goats In Grass-Legume Cafeteria, J P. Singh, Vinod Shankar, V S. Upadhyay
Foraging Behaviour Of Heifers, Sheep And Goats In Grass-Legume Cafeteria, J P. Singh, Vinod Shankar, V S. Upadhyay
IGC Proceedings (1977-2023)
The paper reports findings of a grazing trial with heifers, sheep and goats in a grass–legume cafeteria involving 45x10 m alternate strips of 18 grasses and 18 legumes. In the first year heifers were grazed. Sheep were introduced in the second year and goats in the third year. The stocking rate was 1.5 ACU/ha. Foraging behaviour of three kinds of animals differed in many respects with grazing and rest durations, choice of species in the forenoon and afternoon and in different seasons. Heifers, by and large, preferred grasses over legumes and browse. Sheep, on the contrary, preferred legumes over grasses …
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 (1977-2023)
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 …
Relationships Between The Nutrient Content Of Irrigated Pasture On Offer And That Selected By Grazing Dairy Cows, W J. Wales, C R. Stockdale, P T. Doyle
Relationships Between The Nutrient Content Of Irrigated Pasture On Offer And That Selected By Grazing Dairy Cows, W J. Wales, C R. Stockdale, P T. Doyle
IGC Proceedings (1977-2023)
An experiment was conducted to determine the dry matter, energy, crude protein and fibre intake by dairy cows in late lactation when grazing perennial pasture offered at allocations of 15, 20, 30 and 40 kg DM/cow.day. The cows consistently selected a diet 10% higher in digestibility than that on offer. In contrast, cows selected diets with crude protein levels increasing from 22% to 40%, above that in pasture on offer, as pasture allocation increased. A similar pattern was observed for the intake of white clover (Trifolium repens L). The increase in the concentration of crude protein in the diet …
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 (1977-2023)
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 …