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Parity, lamb weight, and litter size influence the delivery stance of ewes: standing or lying
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Edité par CCSD ; Wageningen Academic Publishers -
Session 79. Welfare issues for small ruminants. International audience. Lambs born to ewes that remain standing at lambing are predisposed to greater birth injuries than those bornto ewes that lie down during the process. Consequently, the type of birth (standing or lying) may influence thevigour of the lamb and compromise its survival. This study investigated how factors such as ewe´s age, bodyweight (BW), body condition score (BCS), duration of parturition, litter size, lamb´s weight and sex, influence theoccurrence of standing vs lying births. One hundred and forty-eight Corriedale ewes (28 primiparous (P): 2-yearold,BW 48.6 ± 4.6 kg, BCS 3.5 ± 0.5, carrying singleton; and 120 multiparous (M): 3-6-year-old, BW 58.6 ± 6.9kg, BCS 3.5 ± 0.5 carrying both singleton and twins) were monitored at an experimental farm in Uruguay (32◦S,54◦W). Data were analysed using GENMOD procedure of SAS. Results are expressed as frequency. For the comparisonbetween P and M, only singleton-lambing ewes were used. Primiparous ewes had more standing birthscompared to M (28.5 % vs 16 %), and the lowest percentage was registered in 6-year-old ewes (0 %, P˂0.001).Litter size influenced the type of birth, with twin births having a higher likelihood of occurring with the ewestanding (34.4 % vs 17.3 %), evident during the delivery of the second twin compared to the first one (21.8 % vs10.9 %). The weight of the lamb was found to correlate with the type of birth: lighter lambs demonstrated a higheroccurrence of standing births, with the percentage decreasing as weight increased (P˂0.001). Duration of parturition,maternal BCS, and sex of the lamb, did not affect the type of birth. In primiparous as well as in twin-bearingewes, lambing without recumbency can be a contributing factor to birth injuries in these susceptible groups.
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