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Effect of Level of Dietary Calcium-Phosphorus during Growth and Gestation on Calcium -Phosphorus Balance and Reproductive Performance of First Litter Sows¹

University of Nebraska³, Lincoln 68583

Abstract

Twenty-four bred gilts were used in a Ca-P metabolism trial. Twelve gilts were fed gestation treatment A (13 g Ca, 10 g/day), while the other 12 were fed gestation treatment B (19.5 g Ca, 15 g P/day). One-half of the gilts in each treatment group were fed .65% Ca, .50% P from 7 to 94 kg, and half were fed .975% Ca, .75% P for the same period. Treatment B gilts excreted more (P<.005) fecal and urinary P. Twenty-four first litter sows fed the same treatment diets during growth and gestation and given .75% Ca, .50% P during lactation were used in a Ca and P balance trial conducted from day 38 to 42 of lactation. No differences in fecal, urinary or milk Ca or P were noted between sows fed the different diets during growth or gestation. A higher (P<-05) value for Ca 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<.05) for both Ca and P balance. No differences were noted in total pigs farrowed, total pigs farrowed alive, average weaning weight or number of pigs weaned. Birth weights were higher (P<.05) for pigs from sows fed diet B during gestation than for pigs from sows fed diet A. Pre- and postfarrowing weights, weaned sow weight and lactation gain were similar regardless of treatment fed during growth or gestation.

¹ Published as Paper No. 6081, Journal Ser., Nebraska Agr. Exp. Sta.

² Present address: Allied Mills, Libertyville, IL 60048.

³ Dept. of Anim. Sci. Acknowledgment is made to Alice Teter for assistance with the preparation of this manuscript and to Mary Barnes, Cecilia Stodd and Tom Crenshaw for laboratory and statistical counsel.