The nutrient status of sheep grazing on a dry Mitchell grass pasture association in central-western Queensland.

McMeniman, NP; Beale, IF; Payne, G

doi:10.1071/rj9890007

Cited by 4 publications

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“…Similarly, Orr and Holmes (1984) reported that the changes in crude protein and crude fibre are consistent with rainfall causing a flush of growth and so increasing the proportion of young leaf and twig high in protein and low in fibre. Rain promotes the growth of herbage that is then available to improve the nutrient content of diets selected by sheep, particularly pregnant and lactating ewes during the late winter-spring period (McMeniman et al 1989).…”

Section: Aboveground Available Phytomass Productionmentioning

confidence: 99%

Preliminary results of a stocking rate trial in Lesotho

Mpiti-Shakhane¹,

Kanyama-Phiri²,

Odenya³

et al. 2002

African Journal of Range & Forage Science

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Forage responses to stocking rates and seasons were determined over a one-year period. The experimental design consisted of three stocking rates namely, light (2.0ha LSU -1 ), moderate (1.25ha LSU -1 ) and heavy (0.5ha LSU -1 ) and four seasons (autumn, winter, spring and summer) combined factorially in a Randomised Complete Block Design with three replicates per treatment. Data collected included aboveground available phytomass production, botanical composition and crude protein content.Total aboveground available phytomass production of forages at the end of the study period was significantly (P<0.05) lower in the heavy stocking rate than in the moderate and light stocking rates. Season significantly (P<0.05) reduced crude protein (CP) from 5.6% CP in summer and 7.8% CP in autumn to 4.2% CP in winter and 4.3% CP in spring. It is concluded that season exerted greater impact on sward productivity than stocking rate.

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Section: Aboveground Available Phytomass Productionmentioning

confidence: 99%

Preliminary results of a stocking rate trial in Lesotho

Mpiti-Shakhane¹,

Kanyama-Phiri²,

Odenya³

et al. 2002

African Journal of Range & Forage Science

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“…Jordan and Le Feuvre (1989) found the mean age of lambs dying in their pen study was 2.7 days, this value being biased upwards by a small number of lambs surviving for longer than a week. Similarly, Stephenson et al (1984) and McMeniman et al (1989) found most deaths to marking occurred in the first few days.…”

Section: D19 Lamb Survivalmentioning

confidence: 72%

“…The avaUabUity of forbs ensures a good quahty diet which is especiaUy important for pregnant and lactating ewes during the late winter / spring period. FaUure of winter rains results in pasture and dietary quahty simUar to that which occurs in the north-west of the state (McMeniman et al 1989). Current joining practice in centralwest Queensland slightly favours spring joining (37%), followed by autumn (24%) and summer {\2%, Pearse 1990).…”

Section: D116 Property Managementmentioning

confidence: 98%

“…However, Moule (1966) reported that while a high proportion of spring joined ewes failed to lamb for properties in central and north-west Queensland, a large number of lambs were lost prior to marking. McMeniman et al (1989) found lamb mortality to be the major source of reproductive wastage in autumn / winter joined ewes in central westem Queensland. Sunilarly, O'Dempsey (1987?…”

Section: D12 Reproductive Performance In Queenslandmentioning

confidence: 98%

“…joining, age is age of ewes in years, tsdmjoin is total standing dry matter (kg/ha) at mid joining, AA^ is change in proportion of pasture nitrogen from mid-joining to marking, rddays is number of rain days in the growing period,/is a measure of frost and its severity on pasture as defined by Z(2 -minimum temperature) if minimum temperature 2°C or less in the period from end of growing period to mid joining, and dayj./ is days from end of previous growing season. climbing to 14.7 and 20.9%o at weaning McMeniman et al (1989). reported two groups of ewes in central westem Queensland, which lost 140 g / day between joining and lambing, had 12 and 28%o mortality during or shortly after parturifion.…”

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confidence: 97%

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Near-real time financial assessment of the Queensland wool industry on a regional basis

Hall

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TJiis thesis describes a systems analysis of the Queensland wool industry at a farm-enterprise level, and development of a computer simulation model designed to provide near real-time physical and financial information to policy makers at a regional level as an aid to decision making.Extensive reviews of the main biological factors affecting the wool enterprise were completed: diet selection and feed intake, protein digestion and metabolism, energy digestion and metabolism, wool growth, reproduction and mortalit}\ A sensitivity analysis of three separate bio-economic models was carried out to identify system components having the greatest impact on the financial performance of wool enterprises. Fleece production, wool price and total variable costs were found to be the most important determinants in each model. Grazfeed, a commercially available software package based on the Australian feeding standards for ruminants, was tested for its ability to simulate animal production as observed in Queensland sheep grazing experiments. A FORTRAN version of the required code for sheep and cattle was written and used in the subsequent analysis. These experiments varied greatly, both temporally and spatially. A number of problems in trial management and methodology were identified, these often required adjustment of recorded data. The collation of trial data was done in a manner that allowed ease of use in computer models. Optimisation software was used to modify parameters and equations within the model in an attempt to improve the agreement between predicted and observed values. Grazfeed was found to be unsuitable using the available test data.Regression analysis techniques were then used to identify climate, soil water, pasture and dietary variables which were able to explain the observed grazing trial variation in annual fleece production and liveweight change. The dietary variables were estimated using a theoretical diet selection subroutine, and a feed intake subroutine based on

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Diet quality, liveweight change and responses to N supplements by cattle grazing

Dixon

Sullivan²,

O’Connor³

et al. 2022

Rangeland J.

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Experiments during 4 years examined the diets selected, growth, and responses to N supplements by Bos indicus-cross steers grazing summer-rainfall semi-arid C4 Astrebla spp. (Mitchell grass) rangelands at a site in north-western Queensland, Australia. Paddock groups of steers were not supplemented (T-NIL), or were fed a non-protein N (T-NPN) or a cottonseed meal (T-CSM) supplement. In Experiment 1, young and older steers were measured during the late dry season (LDS) and the rainy season (RS), while steers in Experiments 2–4 were measured through the annual cycle. Because of severe drought the measurements during Experiment 3 annual cycle were limited to T-NIL steers. Pasture availability and species composition were measured twice annually. Diet was measured at 1–2 week intervals using near infrared spectroscopy of faeces (F.NIRS). Annual rainfalls (1 July–30 June) were 42–68% of the long-term average (471 mm), and the seasonal break ranged from 17 December to 3 March. There was wide variation in pasture, diet (crude protein (CP), DM digestibility (DMD), the CP to metabolisable energy (CP/ME) ratio) and steer liveweight change (LWC) within and between annual cycles. High diet quality and steer liveweight (LW) gain during the RS declined progressively through the transition season (TS) and early dry season (EDS), and often the first part of the LDS. Steers commenced losing LW as the LDS progressed. In Experiments 1 and 2 where forbs comprised ≤15 g/kg of the pasture sward, steers selected strongly for forbs so that they comprised 117–236 g/kg of the diet. However, in Experiments 3 and 4 where forbs comprised substantial proportions of the pasture (173–397 g/kg), there were comparable proportions in the diet (300–396 g/kg). With appropriate stocking rates the annual steer LW gains were acceptable (121–220 kg) despite the low rainfall. The N supplements had no effect on steer LW during the TS and the EDS, but usually reduced steer LW loss by 20–30 kg during the LDS. Thus during low rainfall years in Mitchell grass pastures there were substantial LW responses by steers to N supplements towards the end of the dry season when the diet contained c. <58 g CP/kg or c. <7.0 g CP/MJ ME.

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The nutrient status of sheep grazing on a dry Mitchell grass pasture association in central-western Queensland.

Cited by 4 publications

References 0 publications

Preliminary results of a stocking rate trial in Lesotho

Preliminary results of a stocking rate trial in Lesotho

Near-real time financial assessment of the Queensland wool industry on a regional basis

Diet quality, liveweight change and responses to N supplements by cattle grazing

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