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RESEARCH ARTICLE

Survival of twin lambs is increased with shrub belts

S. M. Robertson A B C D , M. A. Friend A B C , J. C. Broster A B C and B. J. King A B C
+ Author Affiliations
- Author Affiliations

A EH Graham Centre for Agricultural Innovation (NSW Department of Primary Industries and Charles Sturt University) Locked Bag 588, Wagga Wagga, NSW 2678, Australia.

B Co-operative Research Centre for Future Farm Industries, Nedlands, WA, Australia.

C Present address: School of Animal and Veterinary Sciences, Charles Sturt University, Locked Bag 588, Wagga Wagga, NSW 2678, Australia.

D Corresponding author. Email: surobertson@csu.edu.au

Animal Production Science 51(10) 925-938 https://doi.org/10.1071/AN11006
Submitted: 17 January 2011  Accepted: 29 July 2011   Published: 11 October 2011

Abstract

Perinatal lamb mortality is a major source of reproductive loss, particularly for twins. A study was conducted to determine whether provision of shelter in the form of shrub belts (a ‘maternity ward’) could increase survival of twin lambs compared with hedgerows, and whether hedgerows improve survival of single lambs compared with unsheltered paddocks. Measurements were recorded for Merino × Poll Dorset cross twin lambs born in hedgerows (phalaris or hessian) or shrub belts and single lambs born in hedgerows or unsheltered paddocks over the years 2007–2009. Records for 382 single and 726 twin lambs were used. The survival of single lambs was not increased (P = 0.06) by hedgerow shelter. The survival of twin lambs in shrubs was 10% higher (P < 0.05) than that in hessian hedgerow shelter in 2008–2009 (0.77 cf. 0.70), associated with a reduction in deaths from starvation and/or mismothering and/or exposure. The hessian shelter was associated with an increased (P < 0.05) growth rate to weaning of single lambs, but the growth rates of twin lambs were lower (P < 0.05) in shrub than in hessian shelter. In 2010, a second study of 178 twin Merino × Poll Dorset cross lambs found that survival of lambs born alive was not improved by shrubs compared with unsheltered paddocks (0.80 versus 0.77; P > 0.05). It is concluded that shrub belts which forced twin-bearing ewes to lamb in a sheltered environment reduced perinatal mortality in one of three datasets, but was not repeated. The shrubs take time to establish, and the benefit will be small if weather is mild during lambing.

Additional keywords: lamb survival, reproduction.


References

Alexander G (1960) Maternal behaviour in the Merino. Proceedings of the Australian Society of Animal Production 3, 105–114.

Alexander G (1962) Temperature regulation in the new-born lamb. IV. The effect of wind and evaporation of water from the coat on metabolic rate and body temperature. Australian Journal of Agricultural Research 13, 82–99.
Temperature regulation in the new-born lamb. IV. The effect of wind and evaporation of water from the coat on metabolic rate and body temperature.Crossref | GoogleScholarGoogle Scholar |

Alexander G (1964) Lamb survival: physiological considerations. Proceedings of the Australian Society of Animal Production 5, 113–122.

Alexander G (1974) Heat loss from sheep. In ‘Heat loss from animals and man.’ (Eds JL Monteith, LE Mount) pp. 173–203. (Butterworths: London)

Alexander G, Lynch JJ (1976) Phalaris windbreaks for shorn and fleeced lambing ewes. Proceedings of the Australian Society of Animal Production 11, 161–165.

Alexander G, Lynch JJ, Mottershead BE (1979) Use of shelter and selection of lambing sites by shorn and unshorn ewes in paddocks with closely or widely spaced shelters. Applied Animal Ethology 5, 51–69.
Use of shelter and selection of lambing sites by shorn and unshorn ewes in paddocks with closely or widely spaced shelters.Crossref | GoogleScholarGoogle Scholar |

Alexander G, Lynch JJ, Mottershead BE, Donnelly JB (1980) Reduction in lamb mortality by means of grass wind-breaks: results of a five-year study. Proceedings of the Australian Society of Animal Production 13, 329–331.

Arnold GW, Morgan PD (1975) Behaviour of the ewe and lamb at lambing and its relationship to lamb mortality. Applied Animal Ethology 2, 25–46.
Behaviour of the ewe and lamb at lambing and its relationship to lamb mortality.Crossref | GoogleScholarGoogle Scholar |

Banchero G (2003) Production of colostrum by Polwarth ewes grazing lucerne pastures: effect of birth type and body condition. In ‘9th world conference on animal production.’ (Eds N Paim, JOJ Barcellos, JB Neto, L Ferrerio, L Franke, ML Bernardi, M Dall’Agnol) pp. 221–222. (Gráfica UFRGS: Porto Alegre, Brazil)

Banchero GE, Quintans G, Martin GB, Milton JTB, Lindsay DR (2004) Nutrition and colostrum production in sheep. 2. Metabolic and hormonal responses to different energy sources in the final stages of pregnancy. Reproduction, Fertility and Development 16, 645–653.
Nutrition and colostrum production in sheep. 2. Metabolic and hormonal responses to different energy sources in the final stages of pregnancy.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2cXmslaksLg%3D&md5=49b5e6573c78dff851671821c49b8b0fCAS |

Banchero GE, Quintans G, Lindsay DR, Milton JTB (2009) A pre-partum lift in ewe nutrition from a high-energy lick or maize or by grazing Lotus uliginosus pasture, increases colostrum production and lamb survival. Animal 3, 1183–1188.
A pre-partum lift in ewe nutrition from a high-energy lick or maize or by grazing Lotus uliginosus pasture, increases colostrum production and lamb survival.Crossref | GoogleScholarGoogle Scholar |

Bird PR, Jackson TT, Kearney GA, Roache A (2007) Effects of windbreak structure on shelter characteristics. Australian Journal of Experimental Agriculture 47, 727–737.
Effects of windbreak structure on shelter characteristics.Crossref | GoogleScholarGoogle Scholar |

Broster JC, Dehaan RL, Swain DL, Friend MA (2010) Ewe and lamb contact at lambing is influenced by both shelter type and birth number. Animal 4, 796–803.
Ewe and lamb contact at lambing is influenced by both shelter type and birth number.Crossref | GoogleScholarGoogle Scholar |

Campbell NA, Arnold GW (1973) The visual assessment of pasture yield. Australian Journal of Experimental Agriculture and Animal Husbandry 13, 263–267.
The visual assessment of pasture yield.Crossref | GoogleScholarGoogle Scholar |

Cayley JWD, Bird PR (1996) ‘Techniques for measuring pastures.’ (Agriculture Victoria: Hamilton, Vic.)

Dennis SM (1974) Perinatal lamb mortality in Western Australia. Australian Veterinary Journal 50, 443–449.
Perinatal lamb mortality in Western Australia.Crossref | GoogleScholarGoogle Scholar | 1:STN:280:DyaE2M%2FptVSnsA%3D%3D&md5=d528300ea2f112a2689e6ead8afdb11cCAS |

Donnelly J (1984) The productivity of breeding ewes grazing on lucerne or grass and clover pastures on the tablelands of southern Australia. III. Lamb mortality and weaning percentage. Australian Journal of Agricultural Research 35, 709–721.
The productivity of breeding ewes grazing on lucerne or grass and clover pastures on the tablelands of southern Australia. III. Lamb mortality and weaning percentage.Crossref | GoogleScholarGoogle Scholar |

Donnelly JR, Moore AD, Freer M (1997) GRAZPLAN: decision support systems for Australian grazing enterprises – I. Overview of the GRAZPLAN project, and a description of the MetAccess and LambAlive DSS. Agricultural Systems 54, 57–76.
GRAZPLAN: decision support systems for Australian grazing enterprises – I. Overview of the GRAZPLAN project, and a description of the MetAccess and LambAlive DSS.Crossref | GoogleScholarGoogle Scholar |

Dwyer CM (2008) The welfare of the neonatal lamb. Small Ruminant Research 76, 31–41.
The welfare of the neonatal lamb.Crossref | GoogleScholarGoogle Scholar |

Egan JK, McLaughlin JW, Thompson RL, McIntyre JS (1972) The importance of shelter in reducing neonatal lamb deaths. Australian Journal of Experimental Agriculture and Animal Husbandry 12, 470–472.
The importance of shelter in reducing neonatal lamb deaths.Crossref | GoogleScholarGoogle Scholar |

Egan JK, Thompson RL, McIntyre JS (1976) An assessment of overgrown Phalaris tuberosa as shelter for newborn lambs. Proceedings of the Australian Society of Animal Production 11, 157–160.

Elliott J, Sneddon J, Lee JA, Blache D (2011) Producers have a positive attitude toward improving lamb survival rates but may be influenced by enterprise factors and perceptions of control. Livestock Science 140, 103–110.
Producers have a positive attitude toward improving lamb survival rates but may be influenced by enterprise factors and perceptions of control.Crossref | GoogleScholarGoogle Scholar |

Everett-Hincks JM, Dodds KG (2008) Management of maternal-offspring behavior to improve lamb survival in easy care sheep systems. Journal of Animal Science 86, E259–E270.
Management of maternal-offspring behavior to improve lamb survival in easy care sheep systems.Crossref | GoogleScholarGoogle Scholar | 1:STN:280:DC%2BD1c3lsVyqsw%3D%3D&md5=93237b69fd1804d176a5049121ae78f5CAS |

Everett-Hincks JM, Blair HT, Stafford KJ, Lopez-Villalobos N, Kenyon PR, Morris ST (2005) The effect of pasture allowance fed to twin- and triplet-bearing ewees in late pregnancy on ewe and lamb behaviour and performance to weaning. Livestock Production Science 97, 253–266.
The effect of pasture allowance fed to twin- and triplet-bearing ewees in late pregnancy on ewe and lamb behaviour and performance to weaning.Crossref | GoogleScholarGoogle Scholar |

Freer M, Moore AD, Donnelly JR (1997) GRAZPLAN: decision support systems for Australian grazing enterprises – II. The animal biology model for feed intake, production and reproduction and the GrazFeed DSS. Agricultural Systems 54, 77–126.
GRAZPLAN: decision support systems for Australian grazing enterprises – II. The animal biology model for feed intake, production and reproduction and the GrazFeed DSS.Crossref | GoogleScholarGoogle Scholar |

Gibb MJ, Treacher TT (1980) The effect of ewe body condition at lambing on the performance of ewes and their lambs at pasture. The Journal of Agricultural Science 95, 631–640.
The effect of ewe body condition at lambing on the performance of ewes and their lambs at pasture.Crossref | GoogleScholarGoogle Scholar |

Glover KMM, Milton JTB, Paganoni BL, Martin GB (2008) Survival of twin lambs born in edible shelter is not increased during mild winter weather in Western Australia. Animal Production in Australia 27, 87

Hancock R, Coe A, Conde de Albite Silva F (1996) Perinatal mortality in lambs in southern Brazil. Tropical Animal Health and Production 28, 266–272.
Perinatal mortality in lambs in southern Brazil.Crossref | GoogleScholarGoogle Scholar | 1:STN:280:DyaK2s7jslOqsQ%3D%3D&md5=39e1069336f01041bdd964b470a076abCAS |

Haughey KG (1980) The effect of birth injury to the foetal nervous system on the survival and feeding behaviour of lambs. In ‘Reviews in rural science no. 4.’ (Eds M Wodzicka-Tomasczewska, TN Edey, JJ Lynch) pp. 109–111. (University of New England: Armidale, NSW)

Haughey KG (1981) Perinatal lamb mortality. In ‘Refresher course on sheep. Proceedings of a refresher course for veterinarians’, Sydney. No. 58, pp. 657–673. (The Post-Graduate Committee in Veterinary Science, University of Sydney)

Hight GK, Jury KE (1970) Hill country sheep production 11. Lamb mortality and birth weights in Romney and Border Leicester × Romney flocks. New Zealand Journal of Agricultural Research 13, 735–752.

Holst PJ, Fogarty NM, Stanley DF (2002) Birth weights, meningeal lesions, and survival of diverse genotypes of lambs from Merino and crossbred ewes. Australian Journal of Agricultural Research 53, 175–181.
Birth weights, meningeal lesions, and survival of diverse genotypes of lambs from Merino and crossbred ewes.Crossref | GoogleScholarGoogle Scholar |

Jefferies BC (1961) Body condition scoring and its use in management. Tasmanian Journal of Agriculture 32, 19–21.

Kelly RW (1992) Lamb mortality and growth to weaning in commercial Merino flocks in Western Australia. Australian Journal of Agricultural Research 43, 1399–1416.
Lamb mortality and growth to weaning in commercial Merino flocks in Western Australia.Crossref | GoogleScholarGoogle Scholar |

Kenyon PR, Morris ST, Revell DK, McCutcheon SN (2003) Shearing during pregnancy – review of a policy to increase birthweight and survival of lambs in New Zealand pastoral farming systems. New Zealand Veterinary Journal 51, 200–207.
Shearing during pregnancy – review of a policy to increase birthweight and survival of lambs in New Zealand pastoral farming systems.Crossref | GoogleScholarGoogle Scholar | 1:STN:280:DC%2BD2MznsVantA%3D%3D&md5=a56cfa5e3c9fa1d9eb2fda58afba42e0CAS |

Kenyon PR, Morel PCH, Morris ST (2004) Effect of liveweight and condition score of ewes at mating, and shearing mid-pregnancy, on birthweights and growth rates of twin lambs to weaning. New Zealand Veterinary Journal 52, 145–149.
Effect of liveweight and condition score of ewes at mating, and shearing mid-pregnancy, on birthweights and growth rates of twin lambs to weaning.Crossref | GoogleScholarGoogle Scholar | 1:STN:280:DC%2BD2M7js1ahsg%3D%3D&md5=b2decef3c2739b5009b46a923fc5c9e2CAS |

Lynch JJ, Alexander G (1976) The effect of gramineous windbreaks on behaviour and lamb mortality among shorn and unshorn Merino sheep during lambing. Applied Animal Ethology 2, 305–325.
The effect of gramineous windbreaks on behaviour and lamb mortality among shorn and unshorn Merino sheep during lambing.Crossref | GoogleScholarGoogle Scholar |

Lynch JJ, Alexander G (1977) Sheltering behaviour of lambing Merino sheep in relation to grass hedges and artificial windbreaks. Australian Journal of Agricultural Research 28, 691–701.
Sheltering behaviour of lambing Merino sheep in relation to grass hedges and artificial windbreaks.Crossref | GoogleScholarGoogle Scholar |

Lynch JJ, Alexander G (1980) The effect of time since shearing on sheltering behaviour by Merino sheep. Proceedings of the Australian Society of Animal Production 13, 325–328.

Mannetje L, Haydock KP (1963) The dry-weight-rank method for the botanical analysis of pasture. Journal of the British Grassland Society 18, 268–275.
The dry-weight-rank method for the botanical analysis of pasture.Crossref | GoogleScholarGoogle Scholar |

McFarlane D (1965) Perinatal lamb losses 1. An autopsy method for the investigation of perinatal losses. New Zealand Veterinary Journal 13, 116–135.
Perinatal lamb losses 1. An autopsy method for the investigation of perinatal losses.Crossref | GoogleScholarGoogle Scholar | 1:STN:280:DyaF28%2FotVeqsw%3D%3D&md5=50507389037e9a32861dd11fcbbdee43CAS |

McLaughlin JW, Egan JK, Poynton WM, Thompson RL (1970) The effect upon neonatal lamb mortality of lambing systems incorporating partial and complete shelter. Proceedings of the Australian Society of Animal Production 8, 337–343.

Miller GR (1968) Some responses of hill ewes and lambs to artificial shelter. Animal Production 10, 59–66.
Some responses of hill ewes and lambs to artificial shelter.Crossref | GoogleScholarGoogle Scholar |

Miller BV (1991) Pregnancy and lambing. In ‘Australian sheep and wool handbook.’ (Ed. DJ Cottle) p. 136. (Inkata Press: Melbourne)

Morris ST, Kenyon PR, Burnham DL, Everett-Hincks JM (2003) The effect of sward height on twin and triplet lamb birth weights and survival rates to weaning. Proceedings of the New Zealand Society of Animal Production 63, 152–154.

Murphy PM, McNeill DM, Fisher JS, Lindsay DR (1996) Strategic feeding of Merino ewes in late pregnancy to increase colostrum production. Proceedings of the Australian Society of Animal Production 21, 227–230.

Nowak R (1996) Neonatal survival: contributions from behavioural studies in sheep. Applied Animal Behaviour Science 49, 61–72.
Neonatal survival: contributions from behavioural studies in sheep.Crossref | GoogleScholarGoogle Scholar |

Nowak R, Porter R, Levy F, Orgeur P, Schaal B (2000) Role of mother–young interactions in the survival of offspring in domestic mammals. Reviews of Reproduction 5, 153–163.
Role of mother–young interactions in the survival of offspring in domestic mammals.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD3cXnt1altb4%3D&md5=e0ab01c77bb86d342dda9ababa50c693CAS |

Obst JM, Day HR (1968) The effect of inclement weather on mortality of Merino and Corriedale lambs on Kangaroo Island. Proceedings of the Australian Society of Animal Production 7, 239–242.

Obst JM, Ellis JV (1977) Weather, ewe behaviour and lamb mortality. Agricultural Record 4, 44–49.

Oldham C, Davidson R, Gray S, Milton JTB, Paganoni B (2008) Edible shelter increases survival of twin but not single lambs born to Merino ewes in winter in Western Australia. Animal Production in Australia 27, 88

Osczevski RJ (1995) The basis of wind chill. Arctic 48, 372–382.

Paganoni BL, Milton JTB, Vinoles Gil C, Glover KMM, Martin GB (2008) Shelter does not increse survival of twin lambs born during mild winter weather. Animal Production in Australia 27, 89

Payne RW, Harding SA, Murray DA, Soutar DM, Baird DB, Glaser AI, Channing IC, Welham SJ, Gilmour AR, Thompson R, Webster R (2009) ‘Genstat release 12 reference manual.’ (VSN International: Hertfordshire, UK)

Plant JW, Ferguson B, O’Halloran W, Marchant R (1976) Proceedings of the Annual Conference of the Australian Veterinary Association 53, 189–190.

Pollard JC (2006) Shelter for lambing sheep in New Zealand: a review. New Zealand Journal of Agricultural Research 49, 395–404.
Shelter for lambing sheep in New Zealand: a review.Crossref | GoogleScholarGoogle Scholar |

Pollard JC, Littlejohn RP (1999) Shelter for lambing in southern New Zealand. II. Sheltering behaviour and effects on productivity. New Zealand Journal of Agricultural Research 42, 171–177.
Shelter for lambing in southern New Zealand. II. Sheltering behaviour and effects on productivity.Crossref | GoogleScholarGoogle Scholar |

SCA (Ed.) (1990) ‘Feeding standards for Australian livestock: ruminants.’ (CSIRO: Melbourne)

Schreurs NM, Kenyon PR, Mulvaney FJ, Morel PCH, West DM, Morris ST (2010) Effect of birthweight and birth rank on the survival of single and twin lambs born to ewe lambs. Animal Production Science 50, 460–464.
Effect of birthweight and birth rank on the survival of single and twin lambs born to ewe lambs.Crossref | GoogleScholarGoogle Scholar |

Smith GM (1977) Factors affecting birthweight, dystocia and preweaning survival in sheep. Journal of Animal Science 44, 745–753.

Stevens D, Alexander G, Lynch JJ (1981) Do Merino ewes seek isolation or shelter at lambing? Applied Animal Ethology 7, 149–155.
Do Merino ewes seek isolation or shelter at lambing?Crossref | GoogleScholarGoogle Scholar |

Stevens D, Alexander G, Lynch JJ (1982) Lamb mortality due to inadequate care of twins by Merino ewes. Applied Animal Ethology 8, 243–252.
Lamb mortality due to inadequate care of twins by Merino ewes.Crossref | GoogleScholarGoogle Scholar |

Sykes AR, Griffiths RG, Slee J (1976) Influence of breed, birthweight and weather on the body temperature of new-born lambs. Animal Production 22, 395–402.
Influence of breed, birthweight and weather on the body temperature of new-born lambs.Crossref | GoogleScholarGoogle Scholar |

Watson RH, Alexander G, Cumming IA, McDonald JW, Mclaughlin JW, Rizzoli D, Williams D (1968) Reduction in perinatal loss of lambs in winter in western Victoria by lambing in sheltered individual pens. Proceedings of the Australian Society of Animal Production 7, 243–249.