Abstract
An experiment investigated the effects of using ensiled alternative forages compared with ensiled ryegrass on lamb productivity, nutrient use efficiency and total excreta losses in a lamb finishing system. Lambs offered alternative forages had a higher liveweight gain and nitrogen use efficiency than lambs offered ryegrass silage (P < 0.001) (Marley et al., 2007). However, balancing the input and output of nutrients within the farm system is critical to ensure both short-term productivity and long-term sustainability, as producers aim to establish whole-farm nutrient balance plans and reduce reliance on bought-in fertilisers. Here we present the findings of the effects of feeding ensiled red clover (Trifolium pratense), lucerne (Medicago sativa), pea (Pisum sativum), kale (Brassica oleracea) compared with ensiled hybrid ryegrass (Lolium hybridicum) on excreta losses from these growing lambs and, therefore, the potential impact of incorporating these forages on nutrient budgets within livestock systems.
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