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The effects of protein and energy content of compound supplements offered at low levels to October-calving dairy cows given grass silage ad libitum


Animal Production 55(2): 169-175
The effects of protein and energy content of compound supplements offered at low levels to October-calving dairy cows given grass silage ad libitum
Ninety-six October calving, multiparous Friesian dairy cows were given from week 2 of lactation perennial ryegrass silage ad libitum, supplemented with one of four compound foods, offered at a flat rate of 3 kg/day. The compound foods differed in crude protein (CP) concentration (210 (LP) and 350 (HP) g/kg dry matter (DM)), achieved by including fish meal at 50 and 250 kg/t respectively; and in metabolizable energy (ME) concentration (12.8 (LE) and 14.0 (HE) MJ/kg, DM), achieved by adding protected fat (approx. 100/kg/t). There were no significant interactions between supplement type in terms of animal performance. Over a average feeding period of 152 days, milk yields were significantly increased by 0.49 kg/day per 100 g supplementary CP (P lt 0.01) and 0.05 kg/day per MJ on supplementary ME (P lt 0.05). Increasing the level of supplementary CP had no effect on milk composition but significantly increased yield of milk protein (67 g/day). An increase in supplementary ME significantly reduced protein concentration in the milk (1.1 g/kg) but had no effect on protein yield. Yield of milk fat was significantly increased (76 g/day). The additional energy also significantly improved cow fertility in terms of a reduced interval from calving to both first service and conception.


Accession: 002249417

DOI: 10.1017/S0003356100037429



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