Economic efficiency of rapeseed oil production by-product use in farmed red deer ration
2011
Proskina, L., Latvia
The research study was targeted at efficiency evaluation of feeding the rapeseed oil cake to farmed red deer (Cervus elaphus) over the winter season thus replacing the traditional ration of rolled grain of equivalent feed value. The deer lose up to 20% of their body weight in the winter season. Hence, a well-balanced feeding programme should be provided to retain their body-weight over the winter season. The efficiency of the rapeseed oil cake in farmed red deer feeding was assessed at the end of the trial based on the feed consumption and costs, the meat outcome and utilisation of crude protein. The feeding trial was performed over the winter of 2010 with farmed red deer (Cervus elaphus). The trial included two groups of animals of identical age: the control (1) group (n1=10) and the trial (2) group (n2=10). Both groups of deer received identical value feed. The trial group received 0.200 kg of rapeseed oil cake replacing 0.450 kg of rolled grain per deer in comparison with the control group. The research data were analysed by a non-parametric statistical methods at the essentiality level α=0.01 for data comparison. The rapeseed oil cake ration of 0.200 kg per day for one deer over the winter season increased the acquired carcass meat outcome by 4.43% and reduced the amount of consumed feed and expenses correspondingly by 3.2% and 8.13% in comparison with the control group. By feeding rapeseed oil cake crude protein content in the excreted manure decreased by 15.02%, i.e. feed crude protein utilisation in deer organism increased by 6.18% in comparison with the control group.
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