School of Agriculture, Food and Ecosystem Sciences - Theses
Permanent URI for this collection
Search Results
1 - 10 of 16
-
ItemBeef-cattle production in the Western District of Victoria : technical and economic relationships between beef cattle and sheep( 1965)Sheep-and-wool production and beef-cattle production are combined on many grazing properties in the Western District of Victoria. In the past beef cattle have generally been regarded as less profitable than sheep as a sole enterprise on a per-acre basis. In previous surveys it has been found that graziers believe that sheep and beef-cattle complement one another in a variety of circumstances because of the different effects of the two types of animal on pasture. It has also been found that sheep and beef cattle on grazing properties are frequently supplementary with respect to labour. The thesis has two main objectives. First it investigates whether the currently available analytical models based on static economic theory are adequate to solve problems of resource allocation between sheep and beef cattle grazing the same pasture. Second, it investigates whether many graziers carry beef cattle partly or solely to satisfy goals other than profit maximisation. The method of achieving the first objective was to compare the static economic theory relating to enterprise combination, and published work dealing with the problem of selecting the optimum combination of two enterprises, with the real situation existing on grazing properties carrying both sheep and beef cattle. The second objective was investigated by means or an interview survey of graziers running both sheep and beef cattle in six Western District parishes. A considerable amount of technical information about beef-cattle production in the Western District was collected in the course of the survey, and the more important points are summarised in the thesis. Of particular interest are the findings that very few graziers purchased cattle for fattening purposes, and that beef cattle were relatively more important on large properties than on small properties. It was concluded that static economic theory does not provide an adequate basis for the description of the situation where sheep and cattle graze the same pasture, or for the determination of the optimum allocation of resources between sheep arid beef cattle grazing together. Sheep and cattle graze pasture differently, and therefore different pastures result as the sheep-cattle ratio is altered. In this situation, the postulates on which the iso-resource function is based, that the shared input or inputs should remain homogeneous and constant in quantity as the outputs of the products change, are violated. Thus strictly speaking it is not possible to derive a valid iso-resource function relating the sheep and beef-cattle enterprises with respect to pasture when the sheep and the cattle graze the same pasture. However, if the changes in the pasture are disregarded, it is possible to design experiments to produce practical approximations of iso-resource curves relating sheep and beef cattle. Information obtained from graziers in this and other surveys, and the results of experiments, strongly suggest that for practical purposes it is reasonable to think of an iso-resource curve for sheep and cattle with respect to pasture as being concave towards the origin, that is, the sacrifice rate of sheep for cattle increases as more cattle are added on a sheep property. Farmer estimates and experimental evidence suggests that the marginal sacrifice rate on most properties may be lower than is generally assumed (nutritional standards imply a linear rate of eight merino whethers per 1,000 lb. steer). Almost all the survey graziers believed that the overall relationship between their sheep and their beef cattle with respect to their total feed supply over the whole year was a competitive one. Most estimated that their sheep and their cattle were complementary or supplementary with respect to pasture over a part of the year, including the Spring, and that their sheep and their cattle competed for scarce pasture at some time in the autumn and winter. The survey results showed that the most important reason for the presence of beef cattle on the survey properties was the value of cattle in controlling and utilising pasture and weed growth. However the value 0f cattle for that purpose appeared to decline as the sheep stocking rate increased. It appeared that on many properties the importance of beef cattle in pasture control was a consequence of a desire on the part of the grazier to maximise profits within the restrictions imposed by limitations on sheep numbers including the grazier's desire to limit his personal effort. Beef cattle were also frequently carried for the reason that they provided a means of stabilising income from year to year. Although the survey results tended to confirm previous findings that sheep and beef cattle are supplementary with respect to labour at certain times during the year, and that beef cattle generally require less labour per unit of return than sheep, few graziers said that they carried beef cattle for those reasons. It was concluded that substantial minority of the survey graziers did carry beef cattle partly or solely to satisfy goals other than profit maximisation. The most important of these goals was the minimisation of personal effort, which was shown not by giving labour as a reason for carrying beef cattle, but indirectly in the affirmation of the value of cattle (rather than additional sheep) in pasture control. A few graziers were motivated by a personal preference for beef cattle. In the situation where the available economic theory is inadequate to solve problems of resource allocation between sheep and beef cattle, and where a substantial proportion of graziers carry beef cattle partly or solely for reasons other than profit maximisation, there is little scope for sophisticated economic procedures. Given additional experimental data to provide indicators of probable "substitution rates", it seems that the allocation of resources between sheep and beef cattle on properties such as those in the survey can best be improved by budgeting possible adjustments.
-
ItemStudies in animal husbandry and agricultural history( 1963)About 8,000 years ago man began domesticating wild animals and turning their growth and production to his own use. Since this time considerable progress has been made towards the complete utilisation of domesticated animal products but only now is the efficiency of production of these products being investigated. To increase this efficiency a thorough understanding of animal body functions is essential. The importance to the ruminant of one body function - salivation, has not been established although various aspects of this subject have been investigated in recent years . To continue these investigations the development of total salivation in . lambs and the effects of the diversion of saliva on the rumen function in adult sheep were examined. In this second experiment the effects of anaesthesia and lateral recumbency on rumen function were also examined because if the use of these unnatural conditions in some experimental techniques. Some animals have been domesticated but many have not. Nearly 8,000 years have passed since the predecessors of our present day domesticated animals were tamed and conditions have changed considerably. Hence it is feasible that domesticated animals may be less efficient producers of the animal products we now need, than the wild animals. This may be particularly true with regard to protein production in the form of lean meat. To investigate this proposition a body composition study was made on a population of wild kangaroos, and an assessment made of this animal species as a potential producer of lean meat. Not only may the efficiency of agricultural production be increased by re-assessing the livestock potential, but this may also be achieved by re-assessing the agricultural use of any given area of land. In countries settled and developed by people from other countries, the new settlers have applied to the new land the agricultural practices of the old. This has often occurred inspite of vast physical differences between the two countries. The practices have been modified and adapted, the crops and livestock acclimatised, nevertheless the whole range of possible forms of agriculture are usually never investigated. In southern Victoria, for almost a century, vines were grown by European settlers had been familiar with these plants in their own countries. The success and failure of the cultivation of this crop by Europeans in a country very different from their own is examined in the second part of this thesis.
-
ItemThe phosphorus requirements of wheat crops grown in the Victorian Mallee( 1969)Some of the material presented in this thesis is based on papers which are already published or are in the process of publication. Paper 1 is taken from - McClelland, V. P. (1968). - Superphosphate on wheat : The cumulative effect of repeated applications on yield response. Aust. J. agric. Res. 19, 1-8. and paper 2 from - McClelland, V. P. (1968). - Superphosphate on wheat z The influence of previous level of application on current effect. Aust. J. exp. Agric. Anim. Husb. 9, 622-4. Other publications from this thesis will also be in this author's name.
-
ItemThe codling moth in Williams pears : a report of an investigation into the problem in the Goulburn Valley, 1936-19( 1944)The codling moth (Cydia pomonella,L.) is the most serious pest of pears in the Goulburn Valley irrigation area. In the Shepparton, Kyabram, and Ardmona districts, there are approximately 3500 acres of Williams Pon Chretien pears grown principally for canning purposes. For some years past, the losses of pears due to the codling moth have been considerable. In 1936 it was estimated, by executives of the Northern Victoria Fruitgrowers' Association, that codling moth losses accounted for as much as 20% of the total pear crop from the area, that is, a loss of at least �20,000 per annum was being experienced by the industry. No investigation of the codling moth had ever been conducted in the Goulburn Valley; and, although a considerable amount of research had been done elsewhere on the control of the pest in apples, little information was available on combatting the codling moth in pears. Ward (1936) conducted a survey of the pear-growing districts of the Goulburn Valley and found that there was a complete lack of uniformity among growers as to the control measures being used against the codling moth. Having no precise information on the seasonal activity of the pest, growers were not In a position to apply their sprays at the correct time, nor was there an efficient spray schedule in general use. In response to a request from the Northern Victoria Fruitgrowers' Association, and with funds made available from a Commonwealth grant for research and advisory work in relation to the apple and pear industry, an investigation of the problem of codling moth in 'NEC pears was commenced in 1936 by the Victorian Department of Agriculture. For the first two years of the investigation, portion of the Oriental Peach Moth Laboratory at the Ardmona Cannery was kindly made available by the Council for Scientific and Industrial Research, and so facilitated a study of the bionomics of the codling moth under Goulburn Valley conditions.
-
Item
-
ItemThe economics of irrigated dairyfarming in the Central Gippsland irrigation district( 1964)It is the purpose of this thesis to investigate the level of managerial efficiency obtaining on a group of dairy farms situated in the Nambrok-Denison area of the Central Gippsland Irrigation District, and to enquire into the possible avenues of increasing the profitability of such undertakings under existing conditions. Emphasis is restricted to analysis at the individual farm level, although the results could be adapted to shed some light on a number of important questions of national policy. Farm management is concerned with the proper combination and operation of production factors, and the choice of crop and livestock enterprises to bring about a maximum and continuous return to the most elementary operation units of farming (Yang 1958, p.4). A broader definition encompasses two further functions, viz. acquisition of factors of production, and adaptation of the farm plan to changing conditions (Castle and Becker 1962, p.253). The present investigation is restricted to an examination of the existing resource allocation efficiency. Thus it represents only a partial analysis of the farm management problem, but one which focuses attention on the more feasible possibilities of increasing farming efficiency in the short run; namely a more efficient reallocation of the resources presently employed on the farm, and the more profitable avenues of investment of additional funds. Farm management research employs the two major processes common to scientific research in general - deduction and induction (Heady 1952., p.14) - and the following pages illustrate this procedure. First, the problem is explicitely stated - how efficiently are the individual farms being managed given relevant restrictions? Second, the theoretically optimum model is defined - in terms of the criteria for efficient resource allocation - and the empirical procedures to be employed in investigating departure from this optimum, lug. residual imputation and regression techniques, are described. The required empirical data is then collected and analysed using the statistical procedures appropriate to the above techniques. Finally, the results of the empirical investigation are examined in the light of the defined criteria for efficient resource use, and on the basis of this comparison between actual and theoretically optimum conditions, suggestions are made regarding the possibilities of more closely approximating the latter.
-
ItemAn economic study of small dairy farms in South Gippsland, Victoria( 1969)From the study of small dairy farms (defined as producing less than 10,000 pounds of butterfat in 1964-65) in the Shire of South Gippsland, and with the aid of a short-term linear programming model of a typical small dairy farm, it was concluded that alleviation of some of the problems of low-income dairy farms may be achieved by both increased levels of technology and increased farm area. The study began with a review of the structure of the dairy industry and an evaluation of research related to the low-income problem in that industry. An assessment of the extent and nature of the small-farm, low-income problem in the Shire of South Gippsland was made using the results of a survey of 26 small dairy farms in the Shire. To aid consideration of the conditions under which a typical small dairy farm, such as in the Shire of South Gippsland, might obtain a "reasonable" income (judged to be a farm income greater than $2,700), a linear programming model was constructed. The model was a short-term one designed to represent a typical small dairy farm. It was used to show the effects on income levels of the use of sideline enterprises such as vealers, pigs and sheep; the effects of changes in the level of technology (increases in production per cow and pasture production per acre), and the means of achieving improved levels; and also the effects of changes in farm area combined with changes in the level of technology. The marketing and support policies relating to the dairy industry play an important part in influencing the low-income problem, principally through the attraction of resources to the industry and the encouragement of resources already committed to the industry to remain. Such an effect calls for structural change and the reinstatement of the forces of supply and demand as the main determinants of the allocation of resources to the industry. The extent of the small-farm problem in the Shire of South Gippsland was indicated by the finding that 34 per cent of the dairy farms in the Shire produced less than 10,000 pounds of butterfat in 1964-65. The survey of 26 of these small dairy farms has permitted a clear definition of a typical small dairy farm in physical and financial terms. As well, it has highlighted the low income levels on such farms which obtained an average net farm income of $514 over the three years 1962-63 to 1964-65 and $769 in 1964-65. Only four of the survey farms had a net farm income greater than $2,000 in 1964-65. Farm-family welfare on most of the farms was considered to be inadequate and the allocation of resources to these farms was judged to be inefficient, even when the equalized and subsidized price for butterfat was taken to represent the social valuation, placed on butterfat. With an optimum allocation of the resources available to a typical small dairy farm, as represented in the linear programming model, it was found that either with or without sideline activities and with up to 400 acres of land such a farm could not be expected to produce a "reasonable" income. However, with moderate increases in the level of technology considerable increases in income levels were obtained (a farm income of $1,999 was obtained with a standard level of technology and 132 acres, but a farm income of $5,378 was obtained with an improved level of technology). It was also observed that the maximum income levels were obtained at farm areas somewhat larger than was typical of. the survey farms and that the farm area giving the maximum income increased with an improved level of technology. Other results indicated off-farm work to be helpful in raising income levels, but it is likely in the longer term to lead to deterioration of the farm. For this reason off-farm work may best be considered as a temporary expedient. It was found that pasture production was a major restriction preventing increased income and for this reason agistment played an important part in many of the plans derived. Working capital, as defined, was not shown to be a major limitation to the attainment of greater income. The value of linear programming in such a study was apparent. By specifying important relationships it was possible to determine the broad effects of a wide variety of changes that might be made. By making assumptions about the real situation and using a number of simplifications an understanding of a complex situation was made possible with this technique. The results showed the importance of increased farm area combined with higher levels of technology and this led to the suggestion that the proposed scheme for the encouragement of amalgamation of small dairy farms by the Commonwealth Government might well include some form of assistance in,planning farm development and raising levels of technology. Such assistance could be made conditional to the granting of help under the scheme. Although amalgamation and improvement in the level of technology are important adjustments, the problem of greater overall production as a result of such changes can only be overcome if changes in structure are made at both the farm and the national levels.
-
ItemPhysical properties of some Victorian soils( 1958?)The study of soil physics is now recognised as an important aspect of agriculture. The maintenance of crumb structure in wheat soils, increasing the infiltration rate on land liable to erosion, the subsurface drainage of horticultural soils, the supply of adequate moisture to irrigated crops, and the prevention of seepage from rice fields are examples of the necessity for understanding the physics of soil. Methods of measurement of such properties are now available to give a reliable picture, and some of these are reported in the first part of this paper for several Victorian soils - there is indeed a lack of such information. However there is a greater deficiency in the understanding of the fundamental reasons of why a soil has the physical properties that it displays. Subsoil permeability has been investigated and is reported on and discussed in the second part of the paper.
-
Item
-
ItemAn investigation of potato gangrene in Victoria : including the identification and comprehensive study of the causal organism, Phoma foveata Foister and a comparison of the Scottish and Victorian isolates with P. eupyrena Sacc., P. solanicola Prill et Del. and Phomopsis tuberivora Guss et Fost( 1957?)In October 1963 attention was drawn to the possibility of an hitherto unknown storage disease of potatoes in Victoria. Diseased tubers if the variety ton ware brought to the Plant Research Laboratory, Burnley, from a property at Clarke's Hill, via Ballarat, and a pycnidial-forming fungus was isolated consistently from lesions by Anderson (1953). Later that month, apparently identical isolates were obtained from diseased tubers of two other varieties which were received from the same property. In consequence, an investigation of dry rots in storage was commenced in September, 1954. One of the original objectives was to determine whether this pycnidial-forming fungus was a causal organism of tuber rot. As the investigation proceeded, it became evident that the fungus in question was responsible for a particular type of rot. In other countries similar types of tuber disease have been attributed to species of the Phomaceae. In the detailed study that followed, attempts were made to identify Victorian isolates with, or to distinguish them from, some of these other storage pathogens. As a result of the investigation, the pycnidial forming fungus has been identified as Phoma foveats Foister.. This fungus is responsible for the disease known as Gangrene of tubers in the British Isles. It has not been recorded previously outside that area. Although most of the work described in this report is laboratory in nature, one of the main aims has been to collect information which may may assist in determining an approach to the control of the disease.