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A Breeding Goal to Improve the Welfare of Sheep

Published online by Cambridge University Press:  11 January 2023

D R Scobie ,
A R Bray  and
D O'Connell
D R Scobie*
Affiliation:
AgResearch, PO Box 60, Lincoln 8152, New Zealand
A R Bray
Affiliation:
AgResearch, PO Box 60, Lincoln 8152, New Zealand
D O'Connell
Affiliation:
AgResearch, PO Box 60, Lincoln 8152, New Zealand
*
† Contact for correspondence and requests for reprints
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Abstract

A polled sheep with a short tail, and devoid of wool on the head, legs, belly and breech, has been proposed as a breeding goal (Scobie et al 1997). This paper examines the practical and welfare implications of such an objective. Mean shearing times were significantly (P < 0.001) slower for control Romney (97s) and Coopworth (88s) ewe hoggets compared to times for both breeds after they were ‘trimmed’ to resemble the breeding goal (47s). Romney wethers were slower to shear than ewes (P < 0.001), but trimmed wethers (53s) were much faster to shear than the untrimmed controls (99s). Trimmed sheep produced less wool (pooled mean weights of fleece wool for trimmed sheep vs total wool for controls being 2.5 vs 3.5 kg; P < 0.001), half the difference (ie 500g) consisting of lower value oddment wools from the untrimmed controls. Tails were docked to 0, 20, 40, 60, 80 and 100 per cent of the distance between the base of the tail and the hock of Perendole lambs, and 0, 20, 40 and 60 per cent on Coopworths. More dags accumulated as the tail stump increased in length, although significance was dependent on the time of year and management system. No flystrike (cutaneous myiasis) was observed in Perendales given physical and chemical protection, while a small proportion of all tail lengths were flystruck in Coopworths given only physical protection. When shorn as hoggets, the time taken to shear Perendole ewes increased with increasing tail length (P < 0.001). Provided the undocked short tail is bare of wool, the proposed breeding goal should deliver an economic solution to sheep breeders attempting to satisfy markets conscious of chemical residue and animal welfare issues in the new millennium.

Keywords

animal welfaredagsfleece coverflystriketail length
Type
Research Article
Information
Animal Welfare , Volume 8 , Issue 4: Special Issue: Genetics and Animal Welfare , November 1999 , pp. 391 - 406
Copyright
© 1999 Universities Federation for Animal Welfare

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References

AgResearch 1993 Code of Ethical Conduct for Animal Experimentation within the New Zealand Pastoral Agricultural Research Institute Inc. AgResearch: Hamilton, New ZealandGoogle Scholar
Billing, A E and Vince, M A 1987 Teat-seeking behaviour in newborn lambs. I. Evidence for the influence of maternal skin temperature. II. Evidence for the influence of the dam’s surface textures and degree of surface yield. Applied Animal Behaviour Science 18: 301–325CrossRefGoogle Scholar
Branford-Oltenacu, E A and Boylan, W J 1974 Inheritance of tail length in crossbred Finn sheep. The Journal of Heredity 65: 331–334CrossRefGoogle Scholar
Carter, A H 1976 Inherited tailessness in sheep. In: Agricultural Research in New Zealand pp 33–34. Annual Report of Research Division, Ministry of Agriculture and Fisheries: Wellington, New ZealandGoogle Scholar
Cockrem, F and Rae, A L 1966 Studies on face cover in the New Zealand Romney Marsh sheep. 1. The relationship between face cover, wool blindness, and productive characters. Australian Journal of Agricultural Research 17: 967–974CrossRefGoogle Scholar
Dun, R B 1954 A comparison between the radical mules operation and the modified mules operation. The Agricultural Gazette 64: 124–128Google Scholar
French, N P, Wall, R and Morgan, K L 1994a Lamb tail docking: a controlled field study on the effects of tail amputation on health and productivity. Veterinary Record 134: 463–467CrossRefGoogle Scholar
French, N P, Wall, R and Morgan, K L 1994b Tail docking of lambs in the control of flystrike. Veterinary Record 135: 47CrossRefGoogle ScholarPubMed
Hargreaves, A L and Hutson, G D 1990a The stress response in sheep during routine handling procedures. Applied Animal Behaviour Science 26: 83–90CrossRefGoogle Scholar
Hargreaves, A L and Hutson, G D 1990b An evaluation of the contribution of isolation, up-ending and wool removal to the stress response to shearing. Applied Animal Behaviour Science 26: 103–113CrossRefGoogle Scholar
James, P J, Gare, D R, Singh, A W, Clark, J P, Ponzoni, R W and Ancell, P M 1991a Studies of the potential for breeding short tail Merinos. Wool Technology and Sheep Breeding 38: 106–111Google Scholar
James, P J, Ponzoni, R W, Gare, D R and Cockrum, KS 1991b Inheritance of short tailedness in South Australian Merinos. Proceedings of the Association of Animal Breeding and Genetics 9: 404–407Google Scholar
Kilgour, R and de Langen, H 1970 Stress in sheep resulting from management practices. Proceedings of the New Zealand Society of Animal Production 30: 65–76Google Scholar
Larsen, J W A, Anderson, N, Vizard, A L, Anderson, G A and Hoste, H 1994 Diarrhoea in Merino ewes during winter: association with trichostrongylid larvae. Australian Veterinary Journal 71: 365–372CrossRefGoogle ScholarPubMed
McGuirk, B J, Ponzoni, R W, Atkins, K D, Gilmour, A R, Morley, F H W and Mäher, L 1981 Factors influencing the time required to shear Merino sheep and its importance as a breeding objective. Australian Journal of Experimental Agriculture and Animal Husbandry 21: 387–394CrossRefGoogle Scholar
Ott, R S 1996 Animal selection and breeding techniques that create diseased populations and compromise welfare. Journal of the American Veterinary Medical Association 208: 1969–1974Google ScholarPubMed
Rathie, K A, Tierney, M L and Mulder, J C 1994 Assessing Wiltshire Horn-Merino crosses: 1. Wool shedding, blowfly strike and wool production traits. Australian Journal of Experimental Agriculture 34: 717–728CrossRefGoogle Scholar
Rauw, W M, Kanis, E, Noordhuizen-Stassen, E N and Grommers, F J 1998 Undesirable side-effects of selection for high production efficiency in farm animals: a review. Livestock Production Science 56: 15–33CrossRefGoogle Scholar
Scobie, D R, Bray, A R and O’Connell, D 1997 The ethically improved sheep concept. Proceedings of the New Zealand Society of Animal Production 57: 84–87Google Scholar
Shutt, D A, Fell, L R, Connell, R, Bell, A K, Wallace, C A and Smith, A I 1987 Stress-induced changes in plasma concentrations of immunoreactive ß-endorphin and Cortisol in response to routine surgical procedures in lambs. Australian Journal of Biological Sciences 40: 97–103CrossRefGoogle Scholar
Shutt, D A, Fell, L R, Connell, R, Bell, A K, Wallace, C A and Smith, A I 1988 Effect of myiasis and acute restraint stress on plasma levels of immunoreactive ß-endorphin, adrenocorticotrophin (ACTH) and Cortisol in the sheep. Australian Journal of Biological Sciences 41: 297–301CrossRefGoogle Scholar
Simm, G, Conington, J, Bishop, S C, Dwyer, C M and Pattinson, S 1996 Genetic selection for extensive conditions. Applied Animal Behaviour Science 47: 47–59CrossRefGoogle Scholar
Tierney, M L 1980 Studies of Wiltshire Horn-Merino crosses. In; Wool Harvesting Research and Development pp 485–495. Australian Wool Corporation: Melbourne, AustraliaGoogle Scholar
Vandergraaff, R 1976 Squamous-cell carcinoma of the vulva in Merino sheep. Australian Veterinary Journal 52: 21–23CrossRefGoogle Scholar
Vizard, A L 1994 Tail docking of lambs in the control of flystrike. Veterinary Record 134: 583CrossRefGoogle ScholarPubMed
Watts, J E and Luff, R L 1978 The importance of the radical Mules operation and tail length for the control of breech strike in scouring Merino sheep. Australian Veterinary Journal 54: 356–357CrossRefGoogle ScholarPubMed
Watts, J E and Marchant, R S 1977 The effects of diarrhoea, tail length and sex on the incidence of breech strike in modified mulesed Merino sheep. Australian Veterinary Journal 53: 118–123CrossRefGoogle ScholarPubMed
Watts, J E, Murray, M D and Graham, N P H 1979 The blowfly strike problem of sheep in New South Wales. Australian Veterinary Journal 55: 325–334CrossRefGoogle ScholarPubMed
Woolaston, R R 1998 Breeding livestock for reduced reliance on chemicals. Wool Technology and Sheep Breeding 46: 124–132Google Scholar