Effect of grazing different forage systems prior to and during mating on the liveweight, condition score, conception and reproductive rate of maternal-composite ewe lambs
M. C. Raeside
A D , J. Byron A , F. Cameron A , C. MacDonald A , S. Rochfort B , D. L. Partington A , G. A. Kearney C and R. Behrendt A
+ Author Affiliations
- Author Affiliations
A Agriculture Victoria Research, Department of Jobs, Precincts and Regions, 915 Mt Napier Road, Hamilton, Vic. 3300, Australia.
B Agriculture Victoria Research, Department of Jobs, Precincts and Regions, 5 Ring Road, La Trobe University, Bundoora, Vic. 3086, Australia.
C Paynes Road, Hamilton, Vic. 3300, Australia.
D Corresponding author. Email: margaret.raeside@agriculture.vic.gov.au
Animal Production Science 61(11) 1116-1128 https://doi.org/10.1071/AN19183
Submitted: 9 April 2019 Accepted: 12 December 2019 Published: 16 June 2020
Abstract
Context: Economic modelling identified that mating of ewe lambs for lambing at 1 year of age has the potential to increase the profitability of sheep-production systems in south-western Victoria. In order to optimise reproductive rates, ewe lambs should weigh at least 35–40 kg, have a condition score (CS) of 3.0 at mating, and be gaining weight (100–150 g/day) during mating. However, typical perennial ryegrass (Lolium perenne L.) pastures in south-west Victoria do not support the attainment of these targets without additional supplementation.
Aim: Our research aimed to determine how grazing summer-active pastures or brassica (Brassica napus L.) forages affects the liveweight, CS, conception and reproductive rate of ewe lambs when offered before and during mating compared with a system using perennial ryegrass plus supplement.
Methods: A field experiment was conducted at Hamilton, Victoria, Australia, in 2014 and 2016 testing seven forage treatments replicated four times in a complete block design. The treatments were: canola (B. napus, two treatments of different cultivars), forage brassica, lucerne (Medicago sativa L.), chicory (Cichorium intybus L.), plantain (Plantago lanceolata L.) and perennial ryegrass.
Key results: Ewe lambs grazing canola or forage brassica had higher (P < 0.05) liveweight gains during the pre-mating and mating periods than those grazing the perennial ryegrass treatment (148 vs 75 g/day in 2014, s.e.m. 17; 139 vs 54 g/day in 2016, s.e.m. 17). In 2014, spring-sown dual-purpose canola, lucerne and chicory resulted in higher (P < 0.05) reproductive rates (144–151%) than the perennial ryegrass treatment (103%); forage brassica and plantain gave intermediate results (128% and 129%).
Conclusion: Brassica forages (including spring-sown canola), lucerne and chicory can support the attainment of key liveweight and CS targets for successful mating of ewe lambs in autumn.
Implications: Spring-sown canola is therefore a viable alternative forage for use by livestock producers in southern Australia and presents an opportunity to incorporate an alternative income stream in mixed-farming systems.
Additional keywords: cropping, feed gap, feed use efficiency, high-rainfall zone, mixed farming systems, water use efficiency.
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