Effect of level of dietary calcium-phosphorus during growth and gestation on calcium-phosphorus balance and reproductive performance of first-litter sows
Nimmo, R.D.; Peo, E.R.; Crenshaw, J.D.; Moser, B.D.; Lewis, A.J.
Journal of Animal Science 52(6): 1343-1349
24 mated gilts were used in a calcium-phosphorus metabolism trial. 12 gilts were fed gestation treatment A (13 g calcium and 10 g phosphorus per day), while the other 12 were fed gestation treatment B (19.5 and 15 g per day resp.). Half of the gilts in each treatment group were fed 0.65% calcium and 0.50% phosphorus from 7 to 94 kg bodyweight, and half were fed 0.975% calcium and 0.75% phosphorus for the same period. Treatment-B gilts excreted more (P<0.005) faecal and urinary phosphorus than gilts on treatment A. 24 first-litter sows fed the same treatment diets during growth and gestation and given 0.75% calcium and 0.50% phosphorus during lactation were used in a calcium and phosphorus balance trial conducted from days 38 to 42 of lactation. No differences in faecal, urinary or milk calcium or phosphorus were noted between sows fed the different diets during growth or gestation. A higher (P<0.05) value for calcium balance during lactation was observed for sows fed treatment diet B during gestation than for those fed gestation diet A. There were growth treatment X gestation treatment interactions (P<0.05) for both calcium and phosphorus balance. No differences were noted in the total number of piglets farrowed, total number of liveborn piglets, av. weaning weight or number of piglets weaned. Birth weights were higher (P<0.05) for piglets from sows fed diet B during gestation than for those from sows fed diet A. Pre- and postfarrowing weights, weaned sow weight and lactation gain were similar regardless of feeding regime during growth or gestation.