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RESEARCH ARTICLE
Contents Vol 50(2)

Influence of stocking rate and mixed grazing of Angora goats and Merino sheep on animal and pasture production in southern Australia. 1. Botanical composition, sward characteristics and availability of components of annual temperate pastures

B. A. McGregor
+ Author Affiliations
- Author Affiliations

Livestock Production Sciences, Future Farming Systems Research Division, Department of Primary Industries, Werribee, Vic. 3030, Australia. Present address: Centre for Material and Fibre Innovation, Deakin University, Geelong, Vic. 3217, Australia. Email: bruce.mcgregor@deakin.edu.au

Animal Production Science 50(2) 138-148 https://doi.org/10.1071/AN09128
Submitted: 30 September 2009  Accepted: 24 December 2009   Published: 11 February 2010

Abstract

The effects of animal species (AS; Angora goats, Merino sheep or goats and sheep mixed grazed together at ratio 1 : 1) and stocking rate (SR; 7.5, 10 and 12.5 animals/ha) on the availability, botanical composition and sward characteristics of annual temperate pastures under continuous grazing were determined in a replicated experiment from 1981 to 1984. AS and SR had significant effects on pasture availability and composition and many AS × SR interactions were detected. The pastures grazed by sheep had significantly reduced content and proportion of subterranean clover and more undesirable grasses compared with those grazed by goats. There were no differences in dry matter availabilities between goat- and sheep-grazed pastures at 7.5/ha, but at 10 and 12.5/ha goat pastures had significantly increased availabilities of green grass, dead and green clover and less weeds compared with sheep pastures. There was a significant AS × SR interaction for the density of seedlings in May following pasture germination. Between July and January, the height of pastures was greater under goats than sheep but from January to March pasture height declined more on goat-grazed than on sheep-grazed pastures. There was an AS × SR interaction for incidence of bare ground. Increasing the SR increased bare ground in pastures grazed by sheep but no change occurred on pastures grazed by goats. Changes in pasture characteristics due to increased SR were minimised on pastures grazed by goats but the grazing of sheep caused larger and faster changes and the pastures were damaged at the highest SR. Goats did not always select the same herbage material as sheep, changed their selection between seasons and were not less selective than sheep. Angora goats were flexible grazers and continually adapted their grazing behaviour to changing herbage conditions. Goat grazing led to an increase in subterranean clover, an accumulation of dead herbage at the base of the sward, reduced bare ground, taller pastures in spring and a more stable botanical composition. Mixed-grazed pasture characteristics were altered with SR. With careful management Angora goats on sheep farms may be used to manipulate pasture composition, to speed up establishment of subterranean clover, to decrease soil erosion and to reduce weed invasion.


Acknowledgements

Financial support was provided by: Victorian Department of Primary Industries, Rural Credits Development Fund (1981–84), Rural Industries Research and Development Corporation. Drs I. A. Cumming and M. S. Sharkey supported project development and Dr R. W. Hodge assisted project management. Ms T. McCallum provided technical assistance, Messr. B. Scott, D. Mitchell and B. Hester assisted in stock management, Mr K. Englund made measurement equipment, Mr K. L. Butler provided biometric advice, Mr J. W. D. Cayley advice on pasture measurement and Dr J. Fegent editorial support.


References


ABS (1985) ‘Livestock and livestock products, Australia.’ (Australian Bureau of Statistics: Canberra)

AMRF (1976) The Australian Mohair Research Foundation. Annual Research Report, December 1976. Canberra, ACT.

Animut G, Goetsch AL (2008) Co-grazing of sheep and goats: benefits and constraints. Small Ruminant Research 77, 127–145.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Barrett D (1987) Angora goat and mohair production. In ‘Go-Goat conference, Brisbane, May 1987’. (Ed. K Edwards) p. 29. (Dove Rural Media and Owen Art: Brisbane)

Birrell HA (1974) The effect of stocking rate and management on annual pasture production, hay yield and pasture production. In ‘Proceedings of the XII international grassland congress, Moscow. Vol. 3’. (Eds VG Iglovikov, AP Movsisyants) pp. 63–70. (International Grasslands Conference Organizing Committee: Moscow)

Birrell HA (1979) Aspects of pasture utilization by the grazing animal. M. Agric. Sc. Thesis, University of Melbourne.

Bryant FC, Kothmann MM, Merrill LB (1979) Diets of sheep, Angora goats, Spanish goats and White-tailed deer under excellent range conditions. Journal of Range Management 32, 412–417.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Carr PM (1971) The future for mohair production. Journal of Agriculture (South Australia) 74, 141–147. open url image1

Cayley JWD , Bird RP (1991) Techniques for measuring pasture. Technical Report No. 191. Department of Agriculture, Hamilton, Vic.

Demment MW , Longhurst WM (1987) Browers and grazers: constraints on feeding ecology imposed by gut morphology and body size. In ‘Proceedings of the IV international conference on goats’. (Eds OP Santana, AG da Silva, WC Foote) pp. 989–1002. (Embrapa-DDT: Brasilia)

du Toit PF (1972) The goat in a bush-grass community. Proceedings of the Grassland Society of South Africa 7, 44–50. open url image1

Gurung NK, Jallow OA, McGregor BA, Watson MJ, McIlroy BKMH, Holmes JHG (1994) Complementary selection and intake of annual pastures by sheep and goats. Small Ruminant Research 14, 185–192.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Harrington G (1977) Diet comparisons between Angora goats, feral goats and Merino sheep. In ‘Proceedings of a symposium on goats for fibre and meat production’. (Eds PJ Holst, NW Moore) pp. 34–37. (Australian Mohair Research Foundation, Australian Society of Animal Production: Sydney)

Hedding RR , Mullett JH (1970) Influence of grass cover on seed production of Trifolium subterraneum var. Bacchus Marsh. In ‘Proceedings of the XI international grassland congress’. (Ed. MJT Norman) pp. 319–322. (University of Queensland Press: Brisbane)

Kenney PA, Davis IF (1975) Effect of time of joining and rate of stocking on the production of Corriedale ewes in southern Victoria. 3. Wool growth and the composition and availability of pasture. Australian Journal of Experimental Agriculture and Animal Husbandry 15, 159–166.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Maher JC, Truelove RN (1978) Breeding Angora goats for mohair. The Agricultural Gazette of New South Wales 89(4), 30–33. open url image1

Maher JM , Martin JJ (1979) Soil and land survey of the State Research Farm Werribee. Research Project Series No. 42. Department of Agriculture, Melbourne, Vic.

Malins I (1971) Angoras in a Merino world. Journal of Agriculture Victoria 69(8), 180–183. open url image1

McGregor BA (2010) Influence of stocking rate and mixed grazing of Angora goats and Merino sheep on animal and pasture production in southern Australia. 2. Live weight, body condition, carcass production and mortality. Animal Production Science 50, 149–157.
| Crossref | GoogleScholarGoogle Scholar | open url image1

McGregor BA, Butler KL (2008) The effect of body condition score, live weight, stocking rate and grazing system on the mortality from hypothermia of Angora goats and the application of results in the assessment of welfare risks to individual and flocks of Angora goats. Australian Veterinary Journal 86, 12–17.
| Crossref | GoogleScholarGoogle Scholar | PubMed | open url image1

McGregor BA, Umar MZ (2000) Production and quality of cashmere grown by adult wether goats fed low quality forage with supplements of either whole barley or lupin grain. Australian Journal of Experimental Agriculture 40, 795–804.
| Crossref | GoogleScholarGoogle Scholar | open url image1

McIntyre GA (1952) A method for unbiased selective sampling, using ranked sets. Australian Journal of Agricultural Research 3, 385–390.
| Crossref | GoogleScholarGoogle Scholar | open url image1

McIntyre GA (1978) Statistical aspects of vegetation sampling. In ‘Measurement of grassland vegetation and animal production’. Bulletin 52. (Ed. L t’Mannetje) p. 260. (Commonwealth Agricultural Bureaux: Farham Royal, UK)

Moylan FD (1978) The Wilbertree story. Mohair Australia 8(4), 5–6. open url image1

Moylan F (1984) Goats on pastures in Australia. Proceedings of the Grassland Society of Victoria 75, 74–79. open url image1

Payne RW (Ed.) (2007) ‘The guide to Genstat. Release 11, Part 2: statistics.’ (VSN International: Hertfordshire, UK)

Sharkey MJ, Hedding RR (1964) The relationship between changes in bodyweight and wool production in sheep at different stocking rates on annual pastures in southern Victoria. Proceedings of the Australian Society of Animal Production 5, 284–290. open url image1

Sharkey MJ, Davis IF, Kenney PA (1964) The effect of rate of stocking with sheep on the botanical composition of an annual pasture in southern Victoria. Australian Journal of Experimental Agriculture and Animal Husbandry 4, 34–38.
| Crossref | GoogleScholarGoogle Scholar | open url image1

Skinner TE (1976) The utilization and management of veld, with special reference to the role of the browsing animal. 2. A comparison between the effects of continuous grazing by Angora goats and Merino sheep on veld in the central lower Karoo. African Journal of Range and Forage Science 11(1), 131–134. open url image1

Squires VR (1982) Dietary overlap between sheep, cattle and goats when grazing in common. Journal of Range Management 35, 116–119.
| Crossref | GoogleScholarGoogle Scholar | open url image1

White DH, McConchie BJ, Currnow BC, Ternouth AR (1980) A comparison of levels of production and profit from grazing Merino ewes and wethers at various stocking rates in northern Victoria. Australian Journal of Experimental Agriculture and Animal Husbandry 20, 296–307.
| Crossref | GoogleScholarGoogle Scholar | open url image1