Effect of time of joining and rate of stocking on the production of Corriedale ewes in southern Victoria. 2. Survival and growth of lambs

Kenney, P.A.; Davis, I.F.

Australian Journal of Experimental Agriculture and Animal Husbandry 14(69): 434-440

1974


Accession: 000076693

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Abstract
During 1968-70, 540 ewes, stocked at 5, 7.5 or 10 females /hectare, lambed between 6 July and 20 Aug. or between 10 Sep. and 29 Oct. each year. Stocking rate had no effect on lamb birth weight, but single lambs born in Sep. weighed 4.5 kg v 4.8 for those born in July (P less than or equal to 0.05). More twins were born in Sep. than in July, and a smaller proportion of lambs survived to weaning (12 wk) from the Sep. than from the July lambing (72-74 v 71-82%). Of lambs born to ewes at 10 females /hectare in 1968 and 1969, 66 and 69% resp. survived v 82 and 78% for lambs born to ewes at 5 females /hectare. The growth rate of lambs born in July was almost linear between birth and weaning within each stocking rate, but growth rate declined as stocking rate increased. For lambs born in Sep., weaning weights were similar at the different stocking rates. Lambs born in July at 5 or 7.5 females /hectare were as much as 8 kg heavier at weaning than lambs born in Sep. at the same stocking rates. [For Pt. I see ABA 42, 2694].