caa a22 4500 386320799 CHVBK 20180307111626.0 cr unu---uuuuu 161130e198808 xx s 000 0 eng 10.1017/S0003356100037120 doi S0003356100037120 pii (NATIONALLICENCE)cambridge-10.1017/S0003356100037120 Fatness, live weight and performance responses of sows to food level in pregnancy [Elektronische Daten] Sixty crossbred females received one of three pregnancy feeding rates over five parities: high (2·3 kg/day); medium (2·0 kg/day) and low (1·7 kg/day) to produce variation in body fatness and live weight. During a 32-day lactation all sows were fed the same allowance according to litter size. At the start of parity 5 ultrasonic P2 backfat depths for the high, medium and low treatments respectively were 11·2, 11·0 and 10·6 (s.e. 1·77) mm while live weight was 184, 177 and 167 (s.e. 8·6) kg. Averaged over five parities, backfat depths at conception were not significantly different between treatments. Sows given higher pregnancy feeding rates in pregnancy were heavier and fatter pre-partum but lost relatively more live weight and backfat during lactation. Regression coefficients for the slope of the relationship between total sow pregnancy weight (kg) and fatness (mm) change, and food intake (kg/day) were 0·2 and 0·04 respectively. Pregnancy feeding rate did not influence the number of live births but total litter weight at weaning was positively related to the weight and fatness of the sow at parturition and her subsequent rate of weight and fat loss during lactation (these characteristics of the sow also being positively related): live weight of litter at 32 days (kg) = 67 - 1·8 sow backfat change in lactation (mm) - 0·4 sow live-weight change in lactation (kg). Absolute sow live weight and fatness were positive influences on readiness to rebreed after weaning. Copyright © British Society of Animal Science 1988 Whittemore C. T. Edinburgh School of Agriculture, West Mains Road, Edinburgh EH9 3JG Smith W. C. Edinburgh School of Agriculture, West Mains Road, Edinburgh EH9 3JG Phillips P. AFRC Unit of Statistics, James Clerk Maxwell Building, Mayfield Road, Edinburgh EH9 3JZ Animal Production Cambridge University Press 47/1(1988-08), 123-130 0003-3561 47:1<123 1988 47 ASC https://doi.org/10.1017/S0003356100037120 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0003356100037120 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Whittemore C. T. Edinburgh School of Agriculture, West Mains Road, Edinburgh EH9 3JG NATIONALLICENCE 700 1- Smith W. C. Edinburgh School of Agriculture, West Mains Road, Edinburgh EH9 3JG NATIONALLICENCE 700 1- Phillips P. AFRC Unit of Statistics, James Clerk Maxwell Building, Mayfield Road, Edinburgh EH9 3JZ NATIONALLICENCE 773 0- Animal Production Cambridge University Press 47/1(1988-08), 123-130 0003-3561 47:1<123 1988 47 ASC CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge