caa a22 4500 386320748 CHVBK 20180307111625.0 cr unu---uuuuu 161130e198802 xx s 000 0 eng 10.1017/S0003356100003123 doi S0003356100003123 pii (NATIONALLICENCE)cambridge-10.1017/S0003356100003123 Responses of lactating sows to food level [Elektronische Daten] Eighty crossbred sows, following a standard feeding regime in pregnancy, received daily either 2·0, 3·5. 5·0 or 6·5 kg diet containing 130 g digestible crude protein, 8·0 g lysine and 13·1 MJ digestible energy per kg over a 28-day lactation to produce variation in body fatness and live weight. Sows on the highest level of feeding gained 13 kg and lost some 3 mm backfat between farrowing and weaning; corresponding changes on the lowest level of feeding were -31 kg and -9 mm backfat. Live weight of the litter at weaning was positively related to sow daily food allowance in lactation, but the major benefit of increasing lactation food allowance was in reducing the rate of maternal body weight and fatty tissue loss. These effects were described by the regression equations: maternal live-weight change in lactation (kg/day) = —1·7+0·34 lactation food intake (kg/day); maternal backfat change in lactation (mm LJSP2) = —0·40+0·05 lactation food intake fkg/day). Sows ingesting less food in lactation catabolized proportionately more body tissue to maintain milk yield and piglet growth, although they achieved this imperfectly, having lighter litters at weaning. Calculation of an overall net balance, taking into account the need subsequently to replenish tissues catabolized in lactation and ensuring efficient rebreeding of the sow, favoured a lactation feeding strategy towards ad libitum. Copyright © British Society of Animal Science 1988 Eastham P. R. Edinburgh School of Agriculture, West Mains Road, Edinburgh EH9 3JC Smith W. C. Edinburgh School of Agriculture, West Mains Road, Edinburgh EH9 3JC Whittemore C. T. Edinburgh School of Agriculture, West Mains Road, Edinburgh EH9 3JC Phillips P. AFRC Unit of Statistics, James Clark Maxwell Building, May field Road, Edinburgh EH9 3JZ Animal Production Cambridge University Press 46/1(1988-02), 71-77 0003-3561 46:1<71 1988 46 ASC https://doi.org/10.1017/S0003356100003123 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0003356100003123 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Eastham P. R. Edinburgh School of Agriculture, West Mains Road, Edinburgh EH9 3JC NATIONALLICENCE 700 1- Smith W. C. Edinburgh School of Agriculture, West Mains Road, Edinburgh EH9 3JC NATIONALLICENCE 700 1- Whittemore C. T. Edinburgh School of Agriculture, West Mains Road, Edinburgh EH9 3JC NATIONALLICENCE 700 1- Phillips P. AFRC Unit of Statistics, James Clark Maxwell Building, May field Road, Edinburgh EH9 3JZ NATIONALLICENCE 773 0- Animal Production Cambridge University Press 46/1(1988-02), 71-77 0003-3561 46:1<71 1988 46 ASC CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge