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Articles 14491 - 14520 of 254169

Full-Text Articles in Life Sciences

Productivity Of Silvipastoral Areas And Management Needs In Arid Regions Of India, N C. Jain Jan 2025

Productivity Of Silvipastoral Areas And Management Needs In Arid Regions Of India, N C. Jain

IGC Proceedings (1977-2023)

In an extremely arid state of India (Rajasthan) having high livestock concentration and vast degraded lands, the State Forest Department has developed community and forest lands into silvipastoral areas by sowing grass (mainly Cenchus ciliaris and C. setigerus) in association with trees. Surveys have revealed high variability in pasture establishment and productivity in different regions. Cenchrus established well in most regions, except the extreme south, if proper sowing methods with closer spacing were followed and soil conservation measures undertaken. Closure from animals helped in favourable grass succession. Establishment of Dichanthium annulatum and Stylosanthes hamata was relatively poor, Analysis of …

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Sheep And Forage Productivity In Rubber Plantations, I Tajuddin, D T. Chong, K F. Ng, W W. Stur, H M. Shelton Jan 2025

Sheep And Forage Productivity In Rubber Plantations, I Tajuddin, D T. Chong, K F. Ng, W W. Stur, H M. Shelton

IGC Proceedings (1977-2023)

The concept of integration of sheep with rubber plantations for weed control and meal production is rapidly gaining recognition in Malaysia. A series of experiments were set up with ACIAR support to determine the level of forage and animal production achievable in rubber plantations and to introduce and evaluate new forage germplasm for sheep grazing under rubber. These experiments showed that (i) the productivity of the currently used cover crops and naturally occurring further as rubber trees matured, (ii) the proportion of the unpalatable cover crop Caloponuim caeruleum increased rapidly with sheep grazing in immature rubber, (iii) reasonable sheep live-weight …

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Potential Of Chamaecytisus Palmensis (Tagasaste) In The Summer Rainfall Areas Of South Africa, Norman F.G Rethman, Willem A. Van Niekerk Jan 2025

Potential Of Chamaecytisus Palmensis (Tagasaste) In The Summer Rainfall Areas Of South Africa, Norman F.G Rethman, Willem A. Van Niekerk

IGC Proceedings (1977-2023)

Preliminary studies with Chamaecytisus palmensis (tagasaste) under summer rainfall conditions in Transvaal province (23-27°S; 26-32°8) have demonstrated that it is adapted to a mean annual rainfall of 500- 750 mm, concentrated in the period October to March. Evaluations at drier (350 mm/year) and colder sites (altitude of 1750 m asl) were unfortunately grazed out by game. The most important limitation on the distribution of this species would, however, appear to· be its susceptibility to Phytophthora root rot organisms. This will probably limit its use on infected soils and especially under waterlogged and subtropical conditions. The species does survive mild frosts …

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A Himalayan Slivipastroral System: Will It Meet The People's Need?, K S. Rao Jan 2025

A Himalayan Slivipastroral System: Will It Meet The People's Need?, K S. Rao

IGC Proceedings (1977-2023)

The effects of increased population and subsequent requirements for food, fuel and fodder in central Himalaya are apparent in the extent of degradation and failure of production systems. The pastoral systems of high altitude central Himalayan villages have come under severe stress owing to reduction in available fodder source's and changed social habits. With the objective of meeting both the needs of the sedentary population for fuel and fodder, and the nomadic pastoralists for grazing, a model silvipastoral system was established. The highlights of the model are the participation of local people, and planting of trees important for wood and …

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Role Of Vesicular Arbuscular Mycorrhizae In Leucaena Establishment, N J. Brandon Jan 2025

Role Of Vesicular Arbuscular Mycorrhizae In Leucaena Establishment, N J. Brandon

IGC Proceedings (1977-2023)

No abstract provided.

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Pasture Growth Around Broad-Leaved Trees Planted For Grassland Stability, A Neal Gilchrist, J R. Dez Hall, A G. Foote Jan 2025

Pasture Growth Around Broad-Leaved Trees Planted For Grassland Stability, A Neal Gilchrist, J R. Dez Hall, A G. Foote

IGC Proceedings (1977-2023)

Concurrent trials were conducted to measure pasture production and botanical composition at I, 4, 7, 10, and 13 m from the trunks of poplars, willows and eucalypts planted at wide spacings to arrest soil erosion on hill country near Gisborne, Hunterville and Masterton, respectively, in the North Island of New Zealand. Results after 3 years indicated a depression in grass+legume dry matter (DM) yield as the tree is approached, averaging 98, 92, 93, and 79% of that at 13 m (assumed to be unaffected by the tree) for 10, 7, 4, and 1 m respectively. The depressed yield at I …

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Shading Increases Yield Of Nitrogen-Limited Tropical Grasses, D.W M. Wild, J R. Wilson, W W. Stur, H M. Shelton Jan 2025

Shading Increases Yield Of Nitrogen-Limited Tropical Grasses, D.W M. Wild, J R. Wilson, W W. Stur, H M. Shelton

IGC Proceedings (1977-2023)

This report summarises current research investigating the enhanced shoot growth and higher nitrogen (N) yield observed in N-deficient tropical grass pastures when moderately shaded. The "shade response" was consistently observed in a number of "run-down" tropical grass pastures, over a range of soil types. White there was evidence of translocation of N from roots of shaded grass, this source did not fully account for the additional N harvested in shoots. A more favourable microclimate at the soil surface-litter layer interface, particularly soil moisture, appeared to be responsible for improved litter breakdown and possibly soil mineralisation activity. The "shade response'' has …

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Persistence Of An Erect And A Prostrate Paspalum Species As Affected By Shade And Defoliation, C C. Wong, W W. Stur Jan 2025

Persistence Of An Erect And A Prostrate Paspalum Species As Affected By Shade And Defoliation, C C. Wong, W W. Stur

IGC Proceedings (1977-2023)

The lack of persistence in sown posture under perennial plantation crops is poorly understood. An experiment was conducted to evaluate the effect of defoliation severity on the growth and survival of an erect and a prostrate-type shade-tolerant grasses when grown at light levels of 100, 50 and 20% of full sunlight. I was hypothesised that a prostrate grass would be able to persist better under frequent defoliation than an erect grass at low light levels, The prostrate Paspaalum wettsteinii and the erect Paspalum malacophyhllum produced a similar total biomass. However, P. wettsteinii had a higher root yield, while P. …

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Prelimiary Evaluation Of Albizia Julibrissin As A Woody Warm-Season Forage, David I. Bransby Jan 2025

Prelimiary Evaluation Of Albizia Julibrissin As A Woody Warm-Season Forage, David I. Bransby

IGC Proceedings (1977-2023)

Evaluation of warm-season forage legumes for the south-eastern USA has been confined almost entirely to herbaceous plants, and woody plants have been largely overlooked. The objective of this study was to evaluate Albizia julibrissin as a woody forage legume. Dry matter yield of leaves was obtained from small plots harvested at 6-week intervals. Individual plants in a separate experiment were harvested every 4, 6, 8, lO and 12 weeks to determine yield response to harvest frequency, Leaf material was also fed to sheep for 3" weeks in a digestibility trial. Cumulative yield in the plot study was l0.1 I/ ha. …

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Growth And Mineral Nutrition In Dichanthium Aristatum Sward Shaded By Tress, P Cruz, N M. Munier-Jolain, R Tournebize, H Sinoquet Jan 2025

Growth And Mineral Nutrition In Dichanthium Aristatum Sward Shaded By Tress, P Cruz, N M. Munier-Jolain, R Tournebize, H Sinoquet

IGC Proceedings (1977-2023)

Gliricidia sepium is an important legume tree used in the silvopastoral systems of the Caribbean area and tropical America. In this work we analysed the effect of its alley cropping on the growth and mineral nutrition of a Dichanthium aristatum sward, Results show that nitrogen uptake and conversion efficiency of solar radiation were twice as high in the shaded grass. Phosphorus and potassium uptake of dichanthium were also improved by tree presence, Better mineral nutrition and growth of a shaded sward could be related to the better water status of the .. grass leaves throughout the day, This effect may …

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Contribution Of Parkia Biglobosa To The Feeding Value Of Pasture Systems In West Africa, Elly N. Sabiiti, J Cobbina, J Lambourne Jan 2025

Contribution Of Parkia Biglobosa To The Feeding Value Of Pasture Systems In West Africa, Elly N. Sabiiti, J Cobbina, J Lambourne

IGC Proceedings (1977-2023)

Parkia (Parkia biglobosa) is an important traditional economic tree legume with several uses for the rural farmers in West Africa, although it has received only limited resenrch. Parkia is dominant in natural pastures or fallow fields that are used for livestock grazing. The tree provides shade to forage grasses and livestock, protects soil from heat and torrential tropical rains, resists fire damage and coppices very well after defoliation. Farmers grow several food crops under the canopy. The fruits, leaves and young seedlings, which are highly nutritious, form an important fodder for livestock in the dry season when natural …

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Comparative Ruminal Nitrogen Degradability Of Tropical Browse And Alfalfa Hays, S Toure-Fall, B Michalet-Doreau Jan 2025

Comparative Ruminal Nitrogen Degradability Of Tropical Browse And Alfalfa Hays, S Toure-Fall, B Michalet-Doreau

IGC Proceedings (1977-2023)

The nitrogen (N) distribution of 2 tropical browse leaves (Balanites aegypliaca and Guiera senegalensis) and of 2 temperate alfalfa (Medicago sativa) hays was determined and the ruminal degradation of total N and fibre N fractions (NDSN, AFN, ADFN) was measured with nylon bag method. The average N degradability of temperate forages was not different, 77.1%, but that of the browse forages varied from 27.5% (G11iera) to 85.1 % (Balanites), The neutral­detergent-soluble N degraded rapidly in the rumen, whereas the acid­detergent-fibre N remained undegraded for all samples. The available fibre N was not high, except …

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Effect Of Shrubs And Trees On Growth And Yield Of Cenchrus Ciliaris In The Three-Strata Forage System, W Suanten, I M. Nitis, S Putra, K Lana Jan 2025

Effect Of Shrubs And Trees On Growth And Yield Of Cenchrus Ciliaris In The Three-Strata Forage System, W Suanten, I M. Nitis, S Putra, K Lana

IGC Proceedings (1977-2023)

A three-strata forage system (TSFS} experiment was carried out for 5 years to compare the effect of Lencaena, Glirlcldia and trees on the growth and yield of buffel grass (Cenchrus clliaris}, The completely randomised design consisted of the integration of Cenchrus with 2 shrub legumes and 3 fodder trees with 9 repl_ications. The 0.25 ha TSFS plot was divided into 11 0.16 ha core area for food crops, 11 0.09 hil peripheral area for Cenchrus, Panicum, Graham stylo, Verano stylo and Centrosema, and • n 200 m circumference area for Ficus, Lannea and Hibiscus planted nt …

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Trees And Shrubs As Secondary Components Of Pasture, A N. Atta-Krah Jan 2025

Trees And Shrubs As Secondary Components Of Pasture, A N. Atta-Krah

IGC Proceedings (1977-2023)

Traditionally, the concept of pasture has precluded tree crops in any meaningful and productive way. Grasses and herbaceous legumes have been the major components of pasture. The place of trees in pasture is often limited to live fencing, and a few other trees interspersed within the pasture, to provide shade for livestock. In tropical and subtropical areas, where trees are a significant part of the natural vegetation, the non-inclusion· of trees in pasture and agricultural production systems and their increasing rate of disappearance from the zone are giving rise to serious environmental and agricultural concerns. There is an increasing realisation …

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Pastures As The Secondary Components In Tree-Pasture Systems, Chin Peng Chen Jan 2025

Pastures As The Secondary Components In Tree-Pasture Systems, Chin Peng Chen

IGC Proceedings (1977-2023)

The multi-stata canopy structure of rain forest allows only I% sunlight penetration, too little for the survival of forage beneath it. However, man-made forest plantation (rubber, oil palm and coconut) allows more light for forage species. Initially, 60-70 forage species were recorded under these modified forest canopies but only one third of them survived heavy shading. Forage dry matter yields declined from 2.8-4.8 I/ha DM at immature phase of plantations, to 0.1-1.0 I/Im at mautre phase. Nutrients. available to grazing animals from forages under plantations were guile high (18.4 kg Nit DM and 5609 MJ MEit DM) from native forages, …

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Grazing Potential Of Desiccation-Tolerant Tropical And Subtropical Grasses, Y A. Sutaryono, D F. Gaff Jan 2025

Grazing Potential Of Desiccation-Tolerant Tropical And Subtropical Grasses, Y A. Sutaryono, D F. Gaff

IGC Proceedings (1977-2023)

Some desiccation-tolerant grasses possess the potential for use as a grazing source for animals. Some species compared favourably in nutrient content and digestibility with other tropical animal fodder grasses. The Sporobolus species, S. aff, fimbriatus, S. lampranthus, S. pellucidus, together with Eragrostis invalida and Eragrostiella nardoides showed the most promising combination of desirable characteristics. Resurrection grasses contained potentially toxic substances, but, it appears, in amounts harmless to animals, Animal feed trials are needed to test their real feed value, palatability and non-toxicity to animals.

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Beef Cow Adaptation To Hot Dry Climates, T.D A. Forbes, J W. Holloway, B G. Warrington Jan 2025

Beef Cow Adaptation To Hot Dry Climates, T.D A. Forbes, J W. Holloway, B G. Warrington

IGC Proceedings (1977-2023)

Behavioural adaptation of Bos taurus (Angus) and B. indicus B: taurus cross (Brangus) females to high ambient temperatures was studied in 2 trials (maximum ambient temperatures of 37 .8 and 32.5°C respectively) in a semi-arid area of south Texas. Brangus females grazed for longer (297 v. 239 min/day, P<0.0001) spent less time in shade (288 v. 395 min/day, P<0.0001), and spent less time watering (95 v. 115 min/day, P<0.0001) than Angus females. Trial by breed interactions were detected (P<0.001) for resting in shade, resting in sun and watering time. Both breeds were apparently restricted in grazing time by high ambient temperatures during both trials, but the Angus were restricted to a greater extent. Although ambient temperatures were lower in the second trial, the threshold for allowing grazing unrestricted by heat stress was apparently not reached for either breed,

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Mixed-Species Grazing In The Highland Sourveld Of South Africa: An Evaluation Of Animal Production Potential, M B. Hardy, N M. Tainton Jan 2025

Mixed-Species Grazing In The Highland Sourveld Of South Africa: An Evaluation Of Animal Production Potential, M B. Hardy, N M. Tainton

IGC Proceedings (1977-2023)

The effects of mixed-species grazing, at 5 cattle to sheep ratios all at the same stocking rale, on individual animal mass change/ ha mass change/ Ila were monitored for 2 grazing seasons, The ratios were balanced in terms of animal units which equate the expected intake of cattle and sheep. The study was conducted on a humid grasslands in which the herbage characteristically loses quality as Jt mature1. Mass gains of individual cattle were higher when the cattle grazed 10ge1her with the sheep than when they grazed alone. This was ascribed to increasing herbage availability as the ratio of cattle …

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Prediction Of Live-Weight Gain Of Cattle Grazing Pastures On Brigalow Soil, M Hirata, C K. Mcdonald, R M. Jones Jan 2025

Prediction Of Live-Weight Gain Of Cattle Grazing Pastures On Brigalow Soil, M Hirata, C K. Mcdonald, R M. Jones

IGC Proceedings (1977-2023)

A model for predicting the live-weight gain-(LWD) of cattle from climatic conditions and pasture and cattle attributes was developed. The model was calibrated and validated against the data from a long-term grazing experiment on brigalow soil, sown with green panic pastures. When validated, the model tended to overestimate LWG as the proportion of green panic (Panicum maximum var. trichoglume) in the pasture decreased, because the model was calibrated, without considering species composition, to data from years when green panic was dominant. This study emphasises the limitations of empirical models of grazing systems. The study also implies that there …

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Beef Production From Commercial Leucaena Leucocephala Pastures In A Dry Subtropical Environment, R L. Clem, C R. Esdale, M J. Conway, D Macintyre Jan 2025

Beef Production From Commercial Leucaena Leucocephala Pastures In A Dry Subtropical Environment, R L. Clem, C R. Esdale, M J. Conway, D Macintyre

IGC Proceedings (1977-2023)

Leucaena leucocephala is a legume widely adapted to the tropics and subtropics and is currently recommended for sowing on fertile clay soils in the subconstal (100-1000 mm) rainfall areas of Queensland. It produces high quality forage that can be used as browse with native or sown grass pastures to improve live-weight gain of grazing beef cattle. At Banana in central Queensland a commercial grazing enterprise has been developed on 1450 ha of land cleared of brigalow scrub and cropped for 20-30 years before sowing to leucaena. Leucaena has been established on about 80% of the property. Stocking rates are varied …

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Improving Livestock Production Using The Heavy-Duty Blade Plough On Pastures Infested With Brigalow Suckers, P Filet, J Agnew, R Barnett, J Clewett Jan 2025

Improving Livestock Production Using The Heavy-Duty Blade Plough On Pastures Infested With Brigalow Suckers, P Filet, J Agnew, R Barnett, J Clewett

IGC Proceedings (1977-2023)

Reducing brigalow {Acacia harpophylla) sucker numbers is necessary to maintain the productivity of grass pastures on brigalow soils in' Australia. Blade ploughing brigalow sucker regrowth is an effective control oplion. A 97% mortality was achieved when brigalow suckers were treated with a blade plough in central Queensland. Pasture yield was 3 times higher in a blade-ploughed paddock than in an adjacent sucker paddock 6 months after treatment and after 2 more summers. During 3 years of grazing, stocking rates were 7 .5 ha/steer in the sucker paddock and 2.3-3.2 ha/steer in the blade0ploughed paddock, Annual· live-weight gains/head were …

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Animal Feed Research In Eastern And Southern Africa: Historical And Actual Priorities, Samuel C. Jutzi, J C. Tothhill Jan 2025

Animal Feed Research In Eastern And Southern Africa: Historical And Actual Priorities, Samuel C. Jutzi, J C. Tothhill

IGC Proceedings (1977-2023)

A review of animal feed research reports from 7 countries of eastern and southern Africa is used to assess historical and actual research emphases. Priority was on feed supply and evaluation for cattle production with strong rangelands improvement programmes. Most research focused on ecologically favoured regions and larger-scale livestock commodity production. Strong efforts for the exploitation of grasses for improved feed supply were supported by legume work for feed quality improvement. There was a strong emphasis on feed agronomy work, one third of all that work involving animals. Component research results were reported with little discussion of target systems implications, …

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Tropical Pasture Establishment In Thailand By Direct-Drilling, C Lekchom, S Sukpituksakul, N Wongsuwan, B R. Watkin Jan 2025

Tropical Pasture Establishment In Thailand By Direct-Drilling, C Lekchom, S Sukpituksakul, N Wongsuwan, B R. Watkin

IGC Proceedings (1977-2023)

The establishment, early production and quality of 4 tropical grasses was compared when established by direct-drilling into uncultivated, herbicide-kllled pasture or when sown into a fully cultivated, well­prepared seedbed. Direct-drilling resulted in significantly better establishment and early production than drilling into a prepared seedbed at the first cut, but not at subsequent cuts. Forage quality in terms of both crude protein and dry matter digestibility was high in all treatments, with no difference between sowing techniques and only small differences between species. Results are discussed in relation to farming practice.

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Legumes In African Star Grass- Herbaceous Legume Pastures As A Partial Substitute For Concentrate Feed For Dairy Production, Francis Asiedu, B Ahmed, R Paterson, R Simpson, R Motta Jan 2025

Legumes In African Star Grass- Herbaceous Legume Pastures As A Partial Substitute For Concentrate Feed For Dairy Production, Francis Asiedu, B Ahmed, R Paterson, R Simpson, R Motta

IGC Proceedings (1977-2023)

Two groups of 10 equally matched Jamaica Hope cows from a commercial dairy farm in Jamaica were grazed (stocking rate 3.5 cows/ha) for 2 years on pure African star grass (Cynodon nlemfuensis) and African star grass in mixture with herbaceous legumes in a cross­over design. Dairy ration was fed at the rate of 0.26 and 0.18 kg/day/ kg milk for the grass and mixed pastures respectively. The proportion of legumes in the mixed pasture averaged 0.35 in 1990/91 and 0.20 in 1991/92. Available herbage dry matter was higher for the grass pasture ( 4.43 v. 4.11 t/ha) but …

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Animal Production And Dynamics Of Pangola Grass, Ryegrass, And White Clover As Influenced By Grazing Pressure, A De Moraes, G E. Maraschin Jan 2025

Animal Production And Dynamics Of Pangola Grass, Ryegrass, And White Clover As Influenced By Grazing Pressure, A De Moraes, G E. Maraschin

IGC Proceedings (1977-2023)

A grazing experiment was conducted at the Estacao Experimental Agronomica - UFRGS, Eldorado do Sul, RS, from June 1989 to March 1990, to evaluate a mixed pasture of pangola grass (Digitaria eriantha), ryegrass (Lolium multiflorum) and white clover (Trifolium repens) under 4 levels of grazing pressure (GP), namely: 3.S, 7 ,0, 10.5 and 14.0 kg DM of forage on offer /100 kg live weight (LW), with 2 field replications. Average live-weight gain (LWG) decreased as grazing pressure increased. Maximum LWG was obtained at grazing pressures of approximately 12%, which was associated with DM residues …

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Cultivated Pasture, Forage On Offer And Animal Responseg, G E. Maraschin, A De Moraes, L.F. A. Da Silva, J Riboldi Jan 2025

Cultivated Pasture, Forage On Offer And Animal Responseg, G E. Maraschin, A De Moraes, L.F. A. Da Silva, J Riboldi

IGC Proceedings (1977-2023)

Animal gains on pasture are influenced by the forage dry mailer on offer (DMO). To ascertain this relationship a pangola grass (Digitaria eriantha) pasture was evaluated under forage DMO levels of 3.5%, 7.0%, 10.5% and 14.0% of live weight (LW)/head/day. Two steers were assigned to each treatment as tester animals plus a number of put-and­take steers to maintain the desired levels of forage DMO, at the Estacao Experimental Agronomica • UFRGS • 30°S, from November 1989 to March 1990 (period I) and from October 1990 to May 1991 (period II). Pasture DM production and crude protein were not …

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Effect Of Supplementation On Pasture Selection By Grazing Steers. I. Quality Of Ingested Forage, O R. Rosso, P O. Gomez, F Overjero Jan 2025

Effect Of Supplementation On Pasture Selection By Grazing Steers. I. Quality Of Ingested Forage, O R. Rosso, P O. Gomez, F Overjero

IGC Proceedings (1977-2023)

Three oesophageal fistulated Hereford steers (average live weight 304 kg) were supplemented throughout a trial at 0, 0.7 or 1.4% of live weight, with a mixture of 90% ground maize and 10% sunflower expeller. Adaptation and sampling periods were 7 and 4 days respectively. Steers were allocated randomly to 4 Agropyron•dominated pastures of 1800, 2000, 8200 and 8900 kg OM/ha and leaf percentage of 5.8, 28.9, 23.2 and 14.0, respectively. Fistula samples were taken once daily, air dried at 60°C and analysed. Supplementation significantly (P<0.05) affected DM digestibility, which was 51.3, 54.7 and 57.2 for 0, 0.7 and 1.4% levels, respectively. Nitrogen and cell wall content differences were not detected. It appears that supplemented steers preferred pasture components with the highest digestibility.

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Seasonal Changes In The Dry Matter Digestibility Of Individual Tillers Of Napiergrass At Two Sites Of At Different Altitudes, Y Ishii, K Ito, H Numaguchi Jan 2025

Seasonal Changes In The Dry Matter Digestibility Of Individual Tillers Of Napiergrass At Two Sites Of At Different Altitudes, Y Ishii, K Ito, H Numaguchi

IGC Proceedings (1977-2023)

An investigation was made into the seasonal changes in the in vitro dry matter digestibility (IVDMD) of leaf blade (LB) and stem (ST) of individual tillers of napiergrass (Pennisetum purpuretum) grown at the high-altitude site (HA) and low-altitude site (LA) in Miyazaki prefecture, south-western Japan. Within a single sampling date, the variation in the IVDMD with tillers was small both for LB and ST. Negative logarithmic relationships held between the LB percentage and tiller dry weight and between the IVDMD and dry weight of LB and ST. The HA plants produced less dry matter as well as digestible …

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Tropical Pastures For Dairy Heifers In The South-Eastern Region Of Brazil, S Aronovich, S R. De Carvalho, Mm Aronovich Jan 2025

Tropical Pastures For Dairy Heifers In The South-Eastern Region Of Brazil, S Aronovich, S R. De Carvalho, Mm Aronovich

IGC Proceedings (1977-2023)

A number of experiments using improved tropical pastures (mostly Digltaria decumbems cv. Transvala) for heifers were made in the south-eastern region of Brazil from 1970. The results are presented as: (A) experiments with heifers during· the nursing period, (B) experiments with heifers after. weaning and (C) experiments with heifers older than 6 months. The results and the economical analyses lead to the following conclusions: ( 1) the use of well managed, improved tropical pastures enables adequate growth and development of dairy heifers, (2) the heifers reach sexual maturity before 20 months of age, and (3) the cost of replacement heifers …

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Mineral Supplementation And Phosphorus Fertilizer Application On Native Pastures In North-East Argentina, R M. Pizzio, O Royo Pallares Jan 2025

Mineral Supplementation And Phosphorus Fertilizer Application On Native Pastures In North-East Argentina, R M. Pizzio, O Royo Pallares

IGC Proceedings (1977-2023)

Extensive cattle production systems in north-east Argentina are based on the use of native pastures. One of the most important limiting factors to improve production is the acute phosphorus deficiency of soils and pastures. A large experiment was set up to study the effect of phosphorus fertiliser and mineral supplementation on the live­weight gain of steers of 2 ages grazing native pastures. Supplementation with a mixture of bone meal and salt, residual effect of P fertilisation, and both treatments applied together increased the annual animal live-weight gain by 60, 66 and 106%, respectively. The response of younger steers to fertiliser …

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