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RESEARCH ARTICLE

Fetal and lamb losses from pregnancy scanning to lamb marking in commercial sheep flocks in southern New South Wales

M. B. Allworth A B , H. A. Wrigley A and A. Cowling A
+ Author Affiliations
- Author Affiliations

A Fred Morley Centre, School of Animal and Veterinary Sciences, Charles Sturt University, Wagga Wagga, NSW 2644, Australia.

B Corresponding author. Email: ballworth@csu.edu.au

Animal Production Science 57(10) 2060-2065 https://doi.org/10.1071/AN16166
Submitted: 17 March 2016  Accepted: 23 June 2016   Published: 29 August 2016

Abstract

Perinatal lamb mortality is a major challenge for sheep producers worldwide. Lamb losses from ultrasound pregnancy scanning to lamb marking were assessed in 125 mobs of ewes sourced predominantly from sheep flocks in southern New South Wales. In total, 103 086 lambs were marked from100 165 ewes present at joining. Despite the majority of producers undertaking best-practice ewe management, including ultrasound scanning for pregnancy and preferential feeding of multiple bearing ewes, losses were similar to those reported previously (11% and 29% for singles and twins respectively). Non-Merino ewes had significantly lower losses than did Merino ewes, irrespective of ram type (13% versus 21%, P < 0.001). There was a tendency for mob size in twin-bearing ewes to influence survival, with a lower mob size (<200) having lower losses (29% versus 33%, P = 0.07). These results are discussed in the context of existing extension advice about ewe management and perinatal lamb mortality.

Additional keywords: lamb mortality, twinning, ultrasound pregnancy scanning.


References

Alexander G, Stevens D, Kilgour R, de Langen H, Mottersead MM, Lynch JJ (1983) Separation of ewes from twin lambs: incidence in several sheep breeds. Applied Animal Ethology 10, 301–317.
Separation of ewes from twin lambs: incidence in several sheep breeds.Crossref | GoogleScholarGoogle Scholar |

Anon. (2008) ‘Wean more lambs.’ (MLA) Available at http://www.makingmorefromsheep.com.au/wean-more-lambs/procedure_10.3.htm [Verified 1 April 2015]

Cumming IA (1977) Relationships in the sheep of ovulation rate with liveweight, breed, season and plane of nutrition. Australian Journal of Experimental Agriculture and Animal Husbandry 17, 234–241.
Relationships in the sheep of ovulation rate with liveweight, breed, season and plane of nutrition.Crossref | GoogleScholarGoogle Scholar |

Hatcher S, Hinch GN, Kilgour RJ, Holst PJ, Refshauge PG, Shands CG (2010) Lamb survival: balancing genetics, selection and management. Australian Farm Business Management Journal 7, 65–78.

Hinch GN, Brien F (2014) Lamb survival in Australian flocks: a review. Animal Production Science 54, 656–666.
Lamb survival in Australian flocks: a review.Crossref | GoogleScholarGoogle Scholar |

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.

Kleemann DO, Walker SK (2005) Fertility in South Australian commercial Merino flocks: sources of reproductive wastage. Theriogenology 63, 2075–2088.
Fertility in South Australian commercial Merino flocks: sources of reproductive wastage.Crossref | GoogleScholarGoogle Scholar | 15826674PubMed |

Paganoni BL, Ferguson MB, Kearney GA, Thompson AN (2014) Increasing weight gain during pregnancy results in similar increases in lamb birthweights and weaning weights in Merino and non-Merino ewes regardless of sire type. Animal Production Science 54, 727–735.
Increasing weight gain during pregnancy results in similar increases in lamb birthweights and weaning weights in Merino and non-Merino ewes regardless of sire type.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 |

Thompson AN, Ferguson MB, Campbell AJD, Gordon DJ, Kearney GA, Oldham CM, Paganoni BL (2011) Improving the nutrition of Merino ewes during pregnancy and lactation increases weaning weight and survival of progeny but does not affect their mature size. Animal Production Science 51, 784–793.
Improving the nutrition of Merino ewes during pregnancy and lactation increases weaning weight and survival of progeny but does not affect their mature size.Crossref | GoogleScholarGoogle Scholar |

VSN International (2013) ‘Genstat for Windows.’ 16th edn. (VSN International: Hemel Hempstead, UK) Available at Genstat.co.uk [Verified 20 December 2014]