Nitrogen rate and stocking rate effects on steer gains from grazed irrigated pangola grass in the Ord Valley, Western Australia

Jones, R. J.

doi:10.1071/ea9900599

Cited by 7 publications

(4 citation statements)

References 10 publications

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“…A range in N fertilizer use efficiency of 1.3 to 4.7 kg steer gain per kg N applied was found for irrigated tropical pastures in Western Australia (Jones 1990). …”

Section: Resultsmentioning

confidence: 96%

“…This N fertilizer use efficiency in steer gain is similar to that summarized for warm-season grasses fertilized at 110 kg N ha-' yr-' in the southeastern USA (Wilkinson and Langdale 1974), and for introduced cool-season grasses fertilized at 45 to 50 kg N ha-' yr-' in western North Dakota Lorenz 1969, 1974). As N application rates increased N fertilizer use efficiency in beef gain decreased in southeastern USA (Wilkinson and Langdale 1974), North Dakota (Rogler and Lorenz 1969), and Australian studies (Jones 1990). …”

Section: The Estimated 2 Million Ha Of Old World Bluestem Established Inmentioning

confidence: 95%

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Nitrogen Fertilizer Use Efficiency in Steer Gain on Old World Bluestem

Berg¹,

Sims²

1995

Journal of Range Management

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“…A range in N fertilizer use efficiency of 1.3 to 4.7 kg steer gain per kg N applied was found for irrigated tropical pastures in Western Australia (Jones 1990). …”

Section: Resultsmentioning

confidence: 96%

Section: The Estimated 2 Million Ha Of Old World Bluestem Established Inmentioning

confidence: 95%

Nitrogen Fertilizer Use Efficiency in Steer Gain on Old World Bluestem

Berg¹,

Sims²

1995

Journal of Range Management

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“…The efficiency of the animal gain which results from the efficiency of the herbage production and intake was estimated between 1.3 and 4.7 (Mears & Humphreys, 1974;Jones, 1990;Humphreys, 1991) and 1.8 kg liveweight per kg N (Euclides et al, 2007b). Fagundes et al (2005) similarly reported (Figure 2) that the efficiency of the higher N levels was reduced in swards of signalgrass (Brachiaria decumbens Stapf.…”

Section: Resultsmentioning

confidence: 99%

Animal production in Tanzania grass swards fertilized with nitrogen

et al. 2009

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-Nitrogen (N) at 100, 200, 300, and 400 kg ha -1 was applied to Tanzania grass swards to evaluate the animal response and relationships between sward characteristics and the performance of young Nellore bulls (Bos indicus) under continuous stocking. A completely randomized experimental design was used with two replications between 11 November 2001 and 15 April 2002 when the sward heights were maintained at 60 cm by using different stocking rates. The average daily gain (ADG) (0.73 kg d -1 ) was not affected by N doses while the number of animal days ha -1 increased linearly from 515 to 1267. On the other hand, the linear increase in the animal yield was 399, 653, 755, and 895 kg ha -1 for N at 100, 200, 300, and 400 kg ha -1 , respectively, while the ratio between the liveweight gain (kg) and N (kg ha -1 ) decreased. Correlation coefficients between ADG and herbage mass, green leaf mass, green herbage mass, proportion of green leaf and leaf:culm ratio were low and nonsignificant. Under the conditions in Northwestern Paraná, the application of N to swards of Tanzania grass is a management option for increasing beef cattle production.

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“…Fertilization Application of nitrogen (N) fertilizer has been widely used to increase animal production from pasture. Increases in annual LW gain have ranged from 1.3 to 4.7 kg LW/kg N (Jones, 1990;Humphreys, 1991). The gain in livestock production appears to be primarily due to the increased amount of forage produced.…”

Section: Strategies For Management Of Grasslandsmentioning

confidence: 99%

The importance of grasslands for animal production and other functions: a review on management and methodological progress in the tropics

Boval

Dixon

2012

Animal

177

106

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The global importance of grasslands is indicated by their extent; they comprise some 26% of total land area and 80% of agriculturally productive land. The majority of grasslands are located in tropical developing countries where they are particularly important to the livelihoods of some one billion poor peoples. Grasslands clearly provide the feed base for grazing livestock and thus numerous high-quality foods, but such livestock also provide products such as fertilizer, transport, traction, fibre and leather. In addition, grasslands provide important services and roles including as water catchments, biodiversity reserves, for cultural and recreational needs, and potentially a carbon sink to alleviate greenhouse gas emissions. Inevitably, such functions may conflict with management for production of livestock products. Much of the increasing global demand for meat and milk, particularly from developing countries, will have to be supplied from grassland ecosystems, and this will provide difficult challenges. Increased production of meat and milk generally requires increased intake of metabolizable energy, and thus increased voluntary intake and/or digestibility of diets selected by grazing animals. These will require more widespread and effective application of improved management. Strategies to improve productivity include fertilizer application, grazing management, greater use of crop by-products, legumes and supplements and manipulation of stocking rate and herbage allowance. However, it is often difficult to predict the efficiency and cost-effectiveness of such strategies, particularly in tropical developing country production systems. Evaluation and on-going adjustment of grazing systems require appropriate and reliable assessment criteria, but these are often lacking. A number of emerging technologies may contribute to timely low-cost acquisition of quantitative information to better understand the soil–pasture–animal interactions and animal management in grassland systems. Development of remote imaging of vegetation, global positioning technology, improved diet markers, near IR spectroscopy and modelling provide improved tools for knowledge-based decisions on the productivity constraints of grazing animals. Individual electronic identification of animals offers opportunities for precision management on an individual animal basis for improved productivity. Improved outcomes in the form of livestock products, services and/or other outcomes from grasslands should be possible, but clearly a diversity of solutions are needed for the vast range of environments and social circumstances of global grasslands.

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Nitrogen rate and stocking rate effects on steer gains from grazed irrigated pangola grass in the Ord Valley, Western Australia

Cited by 7 publications

References 10 publications

Nitrogen Fertilizer Use Efficiency in Steer Gain on Old World Bluestem

Nitrogen Fertilizer Use Efficiency in Steer Gain on Old World Bluestem

Animal production in Tanzania grass swards fertilized with nitrogen

The importance of grasslands for animal production and other functions: a review on management and methodological progress in the tropics

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