Genetic alternatives to mulesing and tail docking in sheep: A review

Australian Journal of Experimental Agriculture

Volumn 46, Issue 1, 2006, Pages 1-18

  James, P J ^a  

^a DEPARTMENT OF AGRICULTURE AND FISHERIES   (Australia)

Author keywords

Flystrike; Lucilia cuprina; Tail length

Indexed keywords

ANIMAL WELFARE; PARASITE CONTROL; SELECTIVE BREEDING; SHEEP;

AUSTRALASIA; AUSTRALIA;

LUCILIA CUPRINA; OVIS ARIES;

EID: 32344447170     PISSN: 08161089     EISSN: None     Source Type: Journal    
DOI: 10.1071/EA05100     Document Type: Review

References (154)

1. Anonymous (1987) Tailless sheep. Australian Merino Society News 4, 1.
2. Atkins KD, McGuirk BJ (1979) Selection for Merino sheep for resistance to fleece-rot and body strike. Wool Technology and Sheep Breeding 27, 15-19.
3. Baker RL, Watson TG, Bisset SA, Viasoff A, Douch PGC (1991) Breeding sheep in New Zealand for resistance to internal parasites, research results and commercial application. In 'Breeding for disease resistance in sheep'. (Eds GD Gray, RR Woolaston) pp. 19-32. (Australian Wool Corporation: Melbourne, Australia)
4. Beattie AW (1962) Relationships amongst productive characters of Merino sheep in North Western Queensland. 2 Estimates of genetic parameters with particular reference to selection for wool weight and crimp frequency. Queensland Journal of Agricultural Science 19, 17-26.
5. Bell AK, May TJ, Gleeson AC (1983) Effect of tail treatment on the healed mules of Merino sheep mulesed at marking. In 'Proceedings of the second national symposium on the sheep blowfly and flystrike in sheep, Sydney, December 1983'. pp. 34-36. (Department of Agriculture New South Wales)
6. Belschner HG (1937a) A review of the sheep blowfly problem in New South Wales. New South Wales Department of Agriculture, Science Bulletin No. 54, pp. 7-60.
7. Belschner HG (19376) Observations on fleece rot and body strike in sheep, particularly in regard to their incidence, type of sheep susceptible and economic importance. New South Wales Department of Agriculture, Science Bulletin No. 54, pp. 61-95.
8. Beveridge WIB (1935) Urine soiling of ewes in relation to blowfly strike. Australian Veterinary Journal 11, 104-106.
9. Beveridge WIB (1984) The origin and early history of the Mules operation. Australian Veterinary Journal 61, 161-163.
10. Bisset SA, Vlassoff CJ, Morrison L (1997) Epidemiology of nematodosis in Romney lambs selectively bred for resistance or susceptibility to nematode infection. Veterinary Parasitology 70, 255-269. doi:10.1016/S0304-4017(96)01148- X
11. Bisset SA, Morris CA, McEwan JC, Vlassoff A (2001) Breeding sheep in New Zealand that are less reliant on anthelmintics to maintain health and productivity. New Zealand Veterinary Journal 49, 236-246.
12. Bowles VM, Carnegie PR, Sandeman R (1987) A scanning electron microscope study of L. cuprina larvae and the development of blowfly strike in sheep International Journal for Parasitology 17, 759-765. doi:10.1016/0020-7519(87) 90055-5
13. Bowles VM, Grey ST, Brandon MR (1992) Cellular immune responses in skin of sheep infected with larvae of Lucilia cuprina, the sheep blowfly. Veterinary Parasitology 44, 151-162. doi:10.1016/0304-4017(92)90153-Z
14. Bowles VM, Meeusen ENT, Young AR, Andrews AE, Nash AD, Brandon MR (1996) Vaccination of sheep against larvae of the sheep blowfly (Lucilia cuprina). Vaccine 14, 1347-1352. doi:10.1016/S0264-410X(96)00052-7
15. Branford-Oltenacu EA, Boylan WJ (1974) Inheritance of tail length in crossbred Finn sheep. The Journal of Heredity 65, 331-334.
16. Brown GH, Turner HN (1968) Responses to selection in Australian Merino sheep. II Estimates of phenotypic and genetic parameters for some production traits in Merino ewes and an analysis of the possible effect of selection on them. Australian Journal of Agricultural Research 33, 355-362.
17. Bull LB (1931) Some observations on dermatitis of the folds in the breech of sheep and its possible relationship to blowfly strike. Australian Veterinary Journal 7, 143-148.
18. Burrell DH (1985) Immunisation of sheep against experimental Pseudomonas aeruginosa dermatitis and fleece rot associated body strike. Australian Veterinary Journal 59, 140-144.
19. Cameron AW (1999) 'Unwelcome partner. The blowfly's pursuit of the Merino sheep.' (Hippo Books: New South Wales)
20. Carter HB (1943) Studies on the biology of the skin and fleece of sheep. Commonwealth Scientific and Industrial Organisation (Australia), Bulletin No. 164, Melbourne, Australia.
21. Carter AH (1976) Inherited tailessness in sheep. In 'Agricultural research in New Zealand'. pp 33-34. New Zealand Ministry of Agriculture and Fisheries, Annual Report of Research Division 1975-76, Wellington, New Zealand.
22. Chapman RE (1993) Progress towards a non-surgical alternative to the Mules operation for the control of blowfly strike. Wool Technology and Sheep Breeding 41, 1-10.
23. Chin JC, Watts JE (1992) Relationship between the immune response of sheep and the population dynamics of bacteria isolated from fleece rot lesions. Veterinary Microbiology 32, 63-74. doi:10.1016/0378-1135(92)90007-G
24. Colditz IG, Lax J, Mortimer SI, Clarke RA, Beh KJ (1994) Cellular inflammatory responses in skin of sheep selected for resistance or susceptibility to fleece rot and fly strike. Parasite Immunology 16, 289-296.
25. Colditz IG, Eisemann CH, Tellam RL, McClure SJ, Mortimer SI, Husband AJ (1996) Growth of Lucilia cuprina larvae following treatment of sheep divergently selected for fleece rot and flystrike with monoclonal antibodies to T lymphocyte subsets and interferon gamma. International Journal for Parasitology 26, 775-782. doi:10.1016/0020-7519(96)00048-3
26. Colditz IG, Piper LR, Atkins KD (2001) Breeding for resistance to flystrike. In 'Proceedings of the FLICS, flystrike and lice IPM control strategies conference'. (Ed. S Champion) pp. 383-394. (University of Tasmania: Hobart)
27. Colditz I, Smith J, Piper LR (2004) Heritable resistance at the skin barrier to blowfly strike in sheep. In 'Proceedings of the 46th annual conference of the Australian Society for Parasitology'. p. 62 (Abstract). (Australian Society for Parasitology Inc.: Fremantle, WA)
28. Deforest ME, Basrur PK (1979) Malformations and Manx syndrome in cats. The Canadian Veterinary Journal. La Revue Veterinaire Canadienne 20, 304-314.
29. Dennis SM (1965) Congenital abnormalities in sheep in Western Australia. Journal of Agriculture Western Australia 6, 691.
30. Dennis SM (1974) A survey of congenital defects of sheep. The Veterinary Record 95, 488-490.
31. Dennis SM (1972) Congenital tail defects in lambs. The Cornell Veterinarian 62, 568-572.
32. Dolling M, Cotton CL, Singletone DJ (1990) Skin freezing is not suitable as an alternative to the mules operation. Proceedings of the Australian Society of Animal Production 18, 470.
33. Douch PGC, Green RS, Morris CA, Bisset SA, Vlassoff A, Baker RL, Watson TG, Hurford AP, Wheeler M (1995) Genetic andphenotypic relationships among anti-Trichostrongylus colubriformis antibody level, faecal egg count and body weight traits in grazing Romney sheep. Livestock Production Science 41, 121-132. doi:10.1016/0301-6226(94)00046-A
34. Dun RB (1954) The radical mules operation and the modified mules operation. Agricultural Gazette of New South Wales 75, 1058-1062.
35. Dun RB (1964) Skin folds and Merino breeding. 1. The net reproductive rates of flocks selected for and against skin fold. Australian Journal of Experimental Agriculture and Animal Husbandry 4, 376-385. doi:10.1071/EA9640376
36. Dunlop LB, Johnston DC (1985) The effects of three mulesing treatments applied to lambs at marking and to ewes at first shearing on the prevention of blowfly strike. In 'Grazing animal welfare symposium'. (Eds BL Moore and PJ Chenoweth) pp. 39-47. (Australian Veterinary Association: Queensland, Australia)
37. Eady SJ, Woolaston RR, Mortimer SI, Lewer RP, Raadsma HW, Swan AA, Ponzoni RW (1996) Resistance to nematode parasites in Merinos Sheep, sources of variation. Australian Journal of Agricultural Research 47, 895-915. doi:10.1071/AR9960895
38. Eady SJ, Woolaston RR, Ward JL, Gray DG, Karlsson J, Greef J (1997) Nemesis- systems for incorporating resistance to worms in Merino breeding programs. Proceedings of the Association for the Advancement of Animal Breeding and Genetics 12, 507-511.
39. East IJ, Eisemann CH (1993) Vaccination against Lucilia cuprina, the causative agent of sheep blowfly strike. Immunology and Cell Biology 71, 453-462.
40. Ercanbrack SK, Knight AD (1978) Frequencies of various birth defects of Targhee and Columbia sheep. The Journal of Heredity 69, 223-227.
41. Ercanbrack SK, Price DA (1971) Frequencies of various birth defects of Rambouillet sheep. The Journal of Heredity 62, 237-243.
42. Ermias E, Rege JEO (2003) Characteristics of live animal allometric measurements associated with body fat in fat tailed sheep. Livestock Production Science 81, 271-281. doi:10.1016/S0301-6226(02)00256-7
43. Fisher MW, Gregory NG, Kent JE, Scobie DR, Mellor DJ, Pollard JC (2004) Justifying the appropriate length for docking lambs tails - a review of the literature. Proceedings of the New Zealand Society of Animal Production 64, 293-296.
44. French NP, Wall R, Morgan KL (1994) Lamb docking, a controlled study of the effects of tail amputation on health and productivity. The Veterinary Record 134, 463-467.
45. Froggat WW (1915) Sheep maggot flies. New South Wales Department of Agriculture, Farmers Bulletin. No. 95.
46. Froggat WW, Froggat JL (1916) Sheep maggot flies No. 2. New South Wales Department of Agriculture, Farmers Bulletin. No. 110.
47. Froggat WW, Froggat JL (1917) Sheep maggot flies No. 3. New South Wales Department of Agriculture, Farmers Bulletin. No. 113.
48. Froggat WW, Froggat JL (1918) Sheep maggot flies No. 4. New South Wales Department of Agriculture, Farmers Bulletin. No. 122.
49. Gill DA, Graham NPH (1939) Miscellaneous observations at 'Dungaleer' on the influence of the conformation of the tail and vulva in relation to 'crutch' strike. Council for Scientific and Industrial Research (Australia) Journal 12, 71-82.
50. Gogolewski RP, Nicholls PJ, Mortimer SI, Mackintosh JA, Nesa M, Ly W, Chin JC. (1996) Serological responses against Pseudomonas aeruginosa in Merino sheep bred for resistance or susceptibility to fleece rot and body strike. Australian Journal of Agricultural Science 47, 917-926. doi:10.1071/AR9960917
51. Graham NPH, Johnstone IL (1947) A surgical operation for the control of tail strike. Australian Veterinary Journal 23, 59-65.
52. Graham NPH, Riches JH, Johnstone IL (1941) The mules operation at marking time. Council for Scientific and Industrial Research (Australia) Journal 14, 233-240.
53. Graham NPH, Johnstone IL, Riches JH (1947) The effect of tail length on susceptibility to flystrike in ewes. Australian Veterinary Journal 23, 31-37.
54. Greeff JC, Karlsson LJE (1997) Genetic relationships between faecal worm egg count and diarrhoea in Merino sheep in a Mediterranean environment. Proceedings of the Association for the Advancement of Animal Breeding and Genetics 12, 333-337.
55. Greeff JC, Karlsson LJE (1999) Will selection for decreased faecal worm egg count result in an increase in diarrhoea? Proceedings of the Association for the Advancement of Animal Breeding and Genetics 13, 508-511.
56. Greeff JC, Karlsson LJE, Besier RB (1999) Breeding sheep resistant to internal parasites Proceedings of the Association for the Advancement of Animal Breeding and Genetics 13, 150-155.
57. Gregory IP (1982) Genetic studies of South Australian Merino sheep. Heritabilities of various wool and body traits. Australian Journal of Agricultural Science 33, 355-362. doi:10.1071/AR9820355
58. Hamori D (1983) 'Constitutional disorders and hereditary diseases in domestic animals.' (Elsevier Scientific Publishing Co.: Amsterdam)
59. Harvey TG, Clarke JN, Meyer HH (1984) Genetic variation in incidence of daggy sheep. Annual Report of the Agricultural Research Division, New Zealand Ministry of Agriculture and Fisheries 1983/84, Wellington, New Zealand.
60. Hawkins CD, Swan R, Chapman HM (1981) The epidemiology of squamous cell carcinoma of the perineal region of sheep Australian Veterinary Journal 57, 455-457.
61. Jackson N, James JW (1970) Comparison of 3 Australian Merino strains for wool and body traits. II. estimates of between-stud genetic parameters. Australian Journal of Agricultural Science 21, 837-856. doi:10.1071/AR9700837
62. James PJ, Ponzoni RW, Walkley JRW, Whiteley KJ, Stafford JE (1987a) Fleece rot in South Australian Merinos, heritability and correlations with fleece characters. In 'Merino improvement programmes in Australia'. (Ed. BJ McGuirk) pp. 341-346. (Australian Wool Corporation: Melbourne)
63. James PJ, Ponzoni RW, Walkley JRW, Whiteley KJ, Stafford JE (1987b) Fleece structure and fleece rot susceptibility in South Australian Merinos. Proceedings of the Association for the Advancement of Animal Breeding and Genetics 6, 352-356.
64. James PJ, Gare DW, Singh AW, Clark JP, Ponzoni RW, Ancell PM (1990) Studies of the potential for breeding short-tail Merinos. Wool Technology and Sheep Breeding 38, 106-111.
65. James PJ, Ponzoni RW, Gare DR, Cockrum KS (1991) Inheritance of short-tailedness in South Australian Merinos. Proceedings of the Association for the Advancement of Animal Breeding and Genetics 9, 404-407.
66. Johnstone IL (1944) The tailing of lambs: the relative importance of normal station procedures. Australian Veterinary Journal 20, 286-291.
67. Johnstone IL, Graham NPH (1941) Comparison of the incidence of crutch strike in plain-breeched sheep and in wrinkly breeched sheep treated by the mules operation. Council for Scientific and Industrial Research (Australia) Journal 14, 229-232.
68. Joint Blowfly Committee (1933) The sheep blowfly problem in Australia. Report No. 1. Council for Scientific and Industrial Research (Australia), Pamphlet No. 37, Melbourne, Australia.
69. Joint Blowfly Committee (1940) The prevention and treatment of blowfly strike in sheep. Report No. 2. Council for Scientific and Industrial Research (Australia), Pamphlet No. 98.
70. Joint Blowfly Committee (1943) Recent advances in the prevention and treatment of blowfly strike in sheep. Supplement to Report No. 2. Council for Scientific and Industrial Research (Australia), Bulletin No. 74.
71. Jordan RM (1952) The description of the No Tail breed of sheep following forty years of breeding. Proceedings of the South Dakota Academy of Science 31, 103-104.
72. Karlsson LJE, Greeff JC (1996) Preliminary genetic parameter of faecal worm egg count and diarrhoea traits in Merino sheep selected for low worm egg count in a Mediterranean environment. Proceedings of the Australian Society of Animal Production 21, 477.
73. Karlsson LJE, Greeff JC, Harris JF (1995) Genetic trends in a selection line for low faecal worm egg count. Proceedings of the Association for the Advancement of Animal Breeding and Genetics 11, 122-125.
74. Karlsson LJE, Evans DI, Greeff JC (2001) Future options to reduce reliance on surgical mulesing. In 'Proceedings of the FLICS, flystrike and lice IPM control strategies conference'. (Ed. S Champion) pp. 364-368. (University of Tasmania: Hobart)
75. Larsen JWA, Vizard AL, Webb-Ware JK, Anderson N (1995) Diarrhoea due to trichostrongylid larvae in Merino sheep - repeatability and differences between bloodlines. Australian Veterinary Journal 72, 196-97.
76. Larsen JWA, Anderson AL, Vizard AL (1999) The pathogenesis and control of diarrhoea and breech soiling in adult Merino sheep International Journal for Parasitology 29, 893-902. doi:10.1016/S0020-7519(99)00050-8
77. Lear D, Faulkner G (1977) Mules a crossbred, Why? Journal of Agriculture Victoria 75, 186-188.
78. Leathwick DM, Atkinson DS (1995) Dagginess and flystrike in lambs grazed on Lotus corniculatus or ryegrass. Proceedings of the New Zealand Society of Animal Production 55, 196-198.
79. Leathwick DM, Heath ACG (2001) Specialist forages - a role in flystrike management? In 'Proceedings of the FLICS, flystrike and lice IPM control strategies conference'. (Ed. S Champion) pp. 374-379. (University of Tasmania: Hobart)
80. Leiper JWG (1961) A new approach to phenothiazine therapy in sheep. The Veterinary Record 63, 885.
81. Lewer RP, Woolaston RR, Howe RR (1995) Studies on Western Australian Merino sheep. III Genetic and phenotypic estimates for subjectively assessed and objectively measured traits in ewe hoggets. Australian Journal of Agricultural Research 46, 379-388. doi:10.1071/AR9950379
82. Litherland AJ, Sorenson E, Niezen J, Bishop D (1992) A pilot evaluation of shedding sheep breeds compared with non-shedding breeds for susceptibility to nematodes and flystrike. Proceedings of the New Zealand Society of Animal Production 52, 233-235.
83. Lottkowitz SN, Presser HA, Hawkins HS (1984) 'Blowfly strike in sheep. Producers knowledge, opinions and use of methods of prevention and control in sheep.' (School of Agriculture and Forestry, University of Melbourne: Parkville, Vic.)
84. Lydekker R (1913) 'The sheep and its cousins.' (E.P. Outton and Co: New York)
85. Mackerras IM (1936) The sheep blowfly problem in Australia. Council for Scientific and Industrial Research, Pamphlet No. 66, pp. 1-39, Melbourne, Australia.
86. May TJ, O'Halloran WJ, Drice S (1983) Effect of tail treatment on the healed mules of Merino sheep at 10 months of age. In 'Proceedings of second national symposium on the sheep blowfly and flystrike in sheep, Sydney, December 1983'. pp. 37-40. (New South Wales Department of Agriculture)
87. McEwan JC, Dodds KG, Watson TG, Greer GJ, Hosking BC, Douch PGC (1995) Selection for host resistance to roundworms by the New Zealand sheep breeding industry, the Wormfec service. Proceedings of the Association for the Advancement of Animal Breeding and Genetics 11, 70-71.
88. McGuirk BJ, Atkins KD (1984) Fleece rot in Merino sheep. The heritability of fleece rot in unselected flocks of medium-wool Peppin Merinos. Australian Journal of Agricultural Research 35, 423-434. doi:10.1071/AR9840423
89. McMahon PR (1943) The inheritance of multifactor characters in sheep. Proceedings of the New Zealand Society of Animal Production 3, 70-81.
90. Morley FHW (1949) Manchester operation with Mules operation modifications. Agricultural Gazette of New South Wales 60, 543-548, 571-575, 655-657.
91. Morley FHW (1953) Selection for economic characters in Australian Merino sheep. III Inheritance of skin fold score in Merinos sheep and problems of scale. Australian Journal of Agricultural Science 4, 204-212. doi:10.1071/AR9530204
92. Morley FHW (1955) Selection for economic characters in Australian Merino sheep. VI Inheritance and interrelationship of some subjectively graded characteristics. Australian Journal of Agricultural Science 6, 873-881. doi:10.1071/AR9550873
93. Morley FHW, Johnstone IL (1984) Development and use of the mules operation. Journal of the Australian Institute of Agricultural Science 50, 86-97.
94. Morley FHW, Donald AD, Donnelly JR, Axelson A, Waller PJ (1976) Blowfly strike in the breech region of sheep in relation to Helminth infection. Australian Veterinary Journal 52, 325-329.
95. Morris CA, Vlassoff A, Bisset SA, Baker RL, West CJ, Hurford A (1997) Responses of Romney sheep to selection for resistance or susceptibility to nematode infection. Animal Science (Penicuik, Scotland) 70, 17-27.
96. Morris CA, Vlassoff A, Bisset SA, Baker RL, West CJ, Hurford A (2000) Continued selection for Romney sheep for resistance or susceptibility to nematode infection, estimates of direct and correlated responses Animal Science (Penicuik, Scotland) 64, 319-329.
97. Mortimer SI, Atkins KD, Raadsma HW (1998) Responses to selection for resistance and susceptibility to fleece rot and body strike in Merino sheep. In 'Proceedings of the 6th world congress on genetics applied to livestock production'. pp. 283-286. (Univeristy of New England: Armidale, NSW)
98. Mortimer SI (2001) Flystrike resistance in the breeding programs of ram breeding flocks. In 'Proceedings of the FLICS, flystrike and lice IPM control strategies conference'. (Ed. S Champion) pp. 406-413. (University of Tasmania: Hobart)
99. Moule GR (1948) The case for the Mules operation. Queensland Agricultural Journal 66, 93-101.
100. Moule GR (1955) The case for the Mules operation. Queensland Agricultural Journal 80, 233-240.
101. Murphy T (1988) Letter to the editor. Australian Merino Society Newsletter 5, 14.
102. Murray MD (1980) Blowfly strike of sheep in southern Australia. 3 Victoria. Agricultural Record 7, 54-58.
103. Murray MD, Ninnes BA (1980) Blowfly strike of sheep in southern Australia. 1 South Australia. Agricultural Record 7, 44-49.
104. Murray MD, Wilkinson (1980) Blowfly strike of sheep in southern Australia. 2 Western Australia. Agricultural Record 7, 50-53.
105. Norris KR (1990) Evidence for the multiple exotic origin of Australian populations of the sheep blowfly Lucilia cuprina (Diptera: Calliphoridae). Australian Journal of Zoology 38, 635-648. doi:10.1071/ZO9900635
106. O'Halloran WJ, Donnelly FB, Ferguson BD, Baillie BG (1983) A comparison of tail lengths and mulesing techniques on Merino lambs at marking. In 'Proceedings of second national symposium on the sheep blowfly and flystrike in sheep, Sydney, December 1983'. pp. 29-34. (New South Wales Department of Agriculture)
107. O'Meara TJ, Nesa M, Raadsma HW, Saville DG, Sandeman RM (1992) Variation in skin inflammatory responses between sheep bred for resistance or susceptibility to fleece rot and blowflystrike. Research in Veterinary Science 52, 205-210.
108. O'Meara TJ, Nesa M, Seaton DS, Sandeman RM (1995) A comparison of inflammatory exudates released from myiasis wounds on sheep bred for resistance or susceptibility to Lucilia cuprina. Veterinary Parasitology 56, 207-223. doi:10.1016/0304-4017(94)00676-4
109. Pocock MJ, Eady SJ, Abbot KA (1995) Nemesis in action - breeding for worm resistance. Proceedings of the Association for the Advancement of Animal Breeding and Genetics 11, 74-78.
110. Pratt MS, Hopkins PS (1976) The use of cryogenic, irritant, fixative and protein denaturing agents for mulesing sheep. Proceedings of the Australian Association of Animal Production 11, 189-192.
111. Raadsma HW (1991) Fleece rot and body strike in Merino sheep. V. Heritability of liability to bodystrike in weaner sheep under flywave conditions. Australian Journal of Agricultural Research 42, 279-293. doi:10.1071/AR9910279
112. Raadsma HW (1993) Fleece rot and bodystrike in Merino sheep. VI Experimental evaluation of some physical fleece and body characteristics as indirect selection criteria for fleece rot. Australian Journal of Agricultural Research 44, 915-931. doi:10.1071/AR9930915
113. Raadsma HW, Rogan IM (1987) Genetic variation in resistance to blowfly strike. In 'Merino Improvement Programs in Australia'. (Ed. BJ McGuirk) pp. 321-340. (Australian Wool Corporation: Melbourne)
114. Raadsma HW, Wilkinson BR (1990) Fleece rot and body strike in Merino sheep. IV Experimental evaluation of traits related to greasy wool colour for indirect selection against fleece rot. Australian Journal of Agricultural Research 41, 139-153. doi:10.1071/AR9900139
115. Raadsma HW, Sandeman RM, Sasiak AB, Engwerda CR, O'Meara TJ (1992) Genetic improvement in resistance to body strike in Merino sheep, where are we at with indirect selection? Proceedings of the Association for the Advancement of Animal Breeding and Genetics 10, 143-146.
116. Rathie KA, Tierney ML, Mulder JC (1994) Assessing Wiltshire Horn-Merino crosses 1. Wool shedding, blowfly strike and wool production traits. Australian Journal of Experimental Agriculture 34, 717-728. doi:10.1071/EA9940717
117. Reid TC, Cottle DJ (1999) Dag formation. Proceedings of the New Zealand Society for Animal Production 59, 52-54.
118. Reid RND, Jones AL (1976) The effect of mulesing in flystrike control in Corriedale and Crossbred sheep in Tasmania. Proceedings of the Australian Association of Animal Production 11, 189-192.
119. Richardson G (1971) Mulesing makes sense. Journal of Agriculture, Victoria 69, 10-11.
120. Riches JH (1941) The relation of tail length to the incidence of blowfly strike of the breech or Merinos sheep. Council for Scientific and Industrial Research (Australia) Journal 14, 88-92.
121. Riches JH (1942) Further observations on the relation of tail length to the incidence of blowfly strike of the breech or Merino sheep. Council for Scientific and Industrial Research (Australia). Journal 15, 3-9.
122. Ryan AF (1954) The sheep blowfly problem in Tasmania. Australian Veterinary Journal 30, 109-103.
123. Sandeman RM, Dowse CA, Carnegie PR (1985) Initial characterisation of the sheep immune response to infections of Lucilia cuprina. International Journal for Parasitology 15, 181-185. doi:10.1016/0020-7519(85)90085-2
124. Sandeman RM, Bowles VM, Stacey IW, Carnegie P (1986) Acquired resistance in sheep to infection with larvae of the blowfly Lucilia cuprina. International Journal for Parasitology 16, 69-75. doi:10.1016/0020-7519(86)90067-6
125. Scobie DR, O'Connell D (2002) Genetic reduction of tail length in New Zealand sheep. Proceedings of the New Zealand Society of Animal Production 62, 195-198.
126. Scobie DR, Bray AR, O'Connell D (1997) The ethically improved sheep concept. Proceedings of the New Zealand Society for Animal Production 57, 84-87.
127. Scobie DR, Bray AR, O'Connell D (1999) A breeding goal to improve the welfare of sheep. Animal Welfare (South Mimms, England) 8, 391-406.
128. Scobie DR, O'Connell D, Bray AR, Cunningham P (2002) Breech strike can be reduced by increased area of naturally bare skin around the perineum of lambs. Animal Production in Australia 24, 201-204.
129. Seaton DS, O'Meara TJ, Chandler RA, Sandeman RM (1992) The sheep antibody response to repeated infection with Lucilia cuprina. International Journal for Parasitology 22, 1169-1174. doi:10.1016/0020-7519(92)90037-L
130. Seddon HR (1931) Conditions which predispose sheep to blowfly attack. Agricultural Gazette of New South Wales 42, 581-594.
131. Seddon HR, Belschner HG (1937) The classification according to susceptibility to breech strike. New South Wales Department of Agriculture, Science Bulletin No. 54, pp. 111-122.
132. Seddon HR, Belschner HG, Mulhearn CR (1931) Studies on cutaneous myaisis of sheep (sheep blowfly attack). New South Wales Department of Agriculture, Science Bulletin. No. 37.
133. Shaw RJ, Morris CA, Green RS, Wheeler M, Bisset SA, Vlassoff A, Douch PGC (1999) Genetic and phenotypic relationships among Trichostrongylus colubriformis - specific immunoglobulin E, Trichostrongylus colubriformis antibody, immunoglobulin G1, faecal egg count and body weight traits in grazing Romney lambs Livestock Production Science 58, 25-32. doi:10.1016/S0301-6226(98) 00196-1
134. Shelton M (1977) Studies on tail length of Rambouillet and Mouflon sheep. The Journal of Heredity 68, 28-30.
135. Shelton M, Miller JC, Magee WT, Hardy WT (1954) A summary offour years work in ram progeny and performance testing. Journal of Animal Science 13, 215-228.
136. Sorrell GC, Hynd PI, Hocking JE, Kuchel T, deSaram W (1990) The use of high energy electrons to depilate the breech of sheep. Australian Veterinary Journal 67, 51-55.
137. Swan RA, Chapman HH, Hawkins CD, Howel J, Spalding VT (1984) The epidemiology of squamous cell carcinoma of the perineal region of sheep, abattoir and flock studies. Australian Veterinary Journal 61, 146-151.
138. Thomas DL, Waldron GD, Lowe GD, Morrical GD, Meyer HH, et al. (2003) Dock length and rectal prolapse in lambs. Length of docked tail and incidence of rectal prolapse in lambs. Journal of Animal Science 81, 2725-2732.
139. Tierney ML (1978) Easy care Merinos through crossbreeding with Wiltshire horn sheep. Wool Technology and Sheep Breeding 26, 21-25.
140. Turner HN, Hayman RH, Riches JH, Roberts NF, Wilson LT (1953) Physical definition of sheep and their fleeces for breeding and husbandry studies, with particular reference to Merino sheep. CSIRO Division of Animal Health, Divisional Report No. 4, Melbourne, Australia.
141. Vandegraaf R (1976) Squamous cell carcinoma of the vulva in Merino sheep Australian Veterinary Journal 52, 21-23.
142. Waghorn GC, Gregory NG, Todd SE, Wesselink R (1999) Dags in sheep; a look at faeces and reasons for dag formation. Proceedings of the New Zealand Grassland Association 61, 43-49.
143. Watts JE (1979) Breech strike in diarrhoea sheep. In 'Proceedings of the national symposium on the sheep blowfly and flystrike in sheep, Sydney, June 1979'. pp. 178-78. (New South Wales Department of Agriculture).
144. Watts JE, Luff RL (1978) The importance of the radical mules operation and tail length for the control of breech strike in diarrhoea Merino sheep. Australian Veterinary Journal 54, 356-357.
145. Watts JE, Marchant RS (1977) The effects of diarrhoea, tail length and sex on the incidence of breech strike in modified mulesed Merino sheep. Australian Veterinary Journal 53, 118-123.
146. Watts JE, Dash KM, Lisle KA (1978) The effect of anthelmintic treatment and other management factors on the incidence of breech strike in Merino sheep. Australian Veterinary Journal 54, 354-362.
147. Watts JE, Murray MD, Graham NPH (1979) The blowfly strike problem of sheep in New South Wales. Australian Veterinary Journal 55, 325-334.
148. Webb-Ware JK, Vizard AL, Lean GR (2000) Effects of tail amputation and treatment with an albendazole contrelled-release capsule on the health and productivity of prime lambs. Australian Veterinary Journal 78, 838-842.
149. Wesselink R, Waghorn GC, McNab WC (1995) 'Causes of dagginess in sheep: a survey of the literature.' (Wools of New Zealand: Palmerston North, New Zealand)
150. Wilson JW (1940) Development of the No Tail sheep. South Dakota Agricultural Experiment Station, Circular 28, Brookings, South Dakota.
151. Woolaston RR, Baker RL (1996) Prospects for breeding small ruminants for resistance to internal parasites. International Journal for Parasitology 26, 845-855. doi:10.1016/S0020-7519(96)80054-3
152. Woolaston RR, Ward JL (1999) Including dag score in Merino breeding programs. Proceedings of the Association for the Advancement of Animal Breeding and Genetics 13, 512-515.
153. Yeo D (1979) Mulesing. South Australian Department of Agriculture and Fisheries, Fact Sheet 430/26, Adelaide, Australia.
154. Young SSY, Turner HN, Dolling CHS (1960) Comparison of estimates of repeatability and heritability for some production traits in Merinos rams and ewes. II Heritability. Australian Journal of Agricultural Research 11, 604-617. doi:10.1071/AR9600604