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Use of whey and concentrate to partially replace whole milk consumption in the rearing of friesian x boran calves



Use of whey and concentrate to partially replace whole milk consumption in the rearing of friesian x boran calves



Animal Feed Science & Technology 36(1-2): 59-66



The feeding of whole milk (3 kg day-1) to cross-bred calves during rearing to weaning at 3 month limits farm income from the sale of milk and processed dairy products in Ethiopia and other parts of Africa. Two experiments were conducted using up to 11 and 7 calves per treatment where whey or additional concentrate were used as a partial replacement for milk solids. In Experiment 1 (days 22-84), 0.22 and 0.29 kg day-1 whey solids or 0.16 kg day-1 additional concentrate dry matter (DM) replacing 0.16 kg day-1 milk solids did not significantly (P > 0.05) affect liveweight gain (LWG; mean 0.36 kg day-1). However, feed conversion ratios (FCR; kg feed DM kg-1 gain) were increased (P < 0.001) from 2.50 with the milk-based diet to 2.63 and 3.16 by substituting while milk with low and high levels of whey, respectively and to 2.88 by substituting while milk with concentrate. Similar results were obtained in Experiment 2 (days 7-84), where 0.20 and 0.27 kg day-1 whey solids and 0.12 kg day-1 concentrate DM replaced 0.14 kg day-1 milk solids and mean LWG was 0.35 kg day-1. There was no significant difference (P > 0.05) in FCR between the milk-based diet (2.69) and that containing the low level of whey (2.70). Higher FCR (P < 0.001) occurred with diets containing a high level of whey (3.37) and the concentrate-based diet (2.94). The proportion of whey consumed of that offered increased as calves became older. Smallholder milk producers in Africa could reduce the milk used in calf rearing by one-third to 2 kg day-1 by feeding whey at 1 kg day-1 at day 15 increasing to 4 kg day-1 from day 57 to weaning. Alternatively, milk solids could be partially replaced in the rearing of cross-bred calves by providing 0.12-0.16 kg day-1 concentrate DM where this is available.

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Accession: 007989224

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DOI: 10.1016/0377-8401(92)90086-l


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