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Effect of adaptation strategies when feeding fresh cassava foliage on intake and physiological responses of lambs

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Abstract

The objective of the experiment was to study different adaptation strategies to avoid HCN intoxication when feeding fresh cassava foliage to sheep. Twenty-four Phan Rang lambs (initial weight = 19.6 kg at 5.5 months of age) were used in the study. The four experimental diets contained guinea grass (Panicum maximum) supplemented with concentrate at 1.5% of body weight (BW) as dry matter (DM) (control) or supplemented with fresh cassava foliage (FCF) that was introduced into the diet with an adaptation period of 0 (FCF-0), 7 (FCF-7) or 21 (FCF-21) days before reaching the target feeding level of 2% of BW. The average intake of FCF expressed as DM was not different amongst the supplemented treatments and ranged from 1.4 to 1.5% of BW but gradually increased during the first 7 days without any adaptation. The hydrogen cyanide consumed varied from 5.1 to 5.4 mg/kg BW and no difference between treatments with cassava foliage in the diet was found. The live weight gain was significantly higher in the treatments control and FCF-7 compared to FCF-21. No significant differences in heart rate, respiration rate and rumen movement were found between diets. The thiocyanate concentration in the urine of the lambs increased concomitantly with the increase in fresh cassava foliage offered during the first part of the experiment. In conclusion, an adaptation period of approximately 7 days seems to be favourable in combined diets where cassava foliage is offered in quantities up to 2% of BW. This level of intake could enhance the intake and LWG of the lambs without any documented effects on heart rate, respiration rate or rumen movements.

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Acknowledgements

The authors wish to express their thanks to the Swedish International Development Agency/Department for Research Cooperation with Developing Countries (Sida/SAREC) for the financial support of the research.

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Correspondence to Ewa Wredle.

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Hue, K.T., Van, D.T.T., Spörndly, E. et al. Effect of adaptation strategies when feeding fresh cassava foliage on intake and physiological responses of lambs. Trop Anim Health Prod 44, 267–276 (2012). https://doi.org/10.1007/s11250-011-0013-0

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