The Effect of Increasing Dietary Manganese from an Organic Source on the Reproductive Performance of Sows
Clint E. Edmunds | Alyssa S. Cornelison | Chantale Farmer | Christof Rapp | Valerie E. Ryman | Wes P. Schweer | Mark E. Wilson | C. Robert Dove
The objective of this study was to determine the effect of dietary manganese on the reproductive performance of sows. Sows (<i>n</i> = 39; 231 ± 8 kg) were randomly assigned to one of three dietary levels of supplemented Mn (CON: 0 ppm Mn; PRO20: 20 ppm Mn; PRO40: 40 ppm Mn). The experimental treatments were initiated at breeding and continued through two parities. The sows were blocked by parity within each farrowing group. The data were analyzed as a randomized complete block design using the MIXED procedure of SAS with diet as a fixed effect and block as a random effect. The lactation feed intake increased in the PRO20 sows compared to the CON and PRO40 sows (<i>p</i> < 0.05). The PRO20 and PRO40 sows farrowed piglets with improved average daily gain from birth to weaning (CON 214 g/day; PRO20 237 g/day; 220 g/day; <i>p</i> < 0.05) compared to the CON sows. The milk fat content was lower in the PRO20 (5.5%) and PRO40 sows (6.1%; <i>p</i> < 0.05) compared to the CON sows (7.8%), possibly due to increased milk demand. Supplementary dietary Mn throughout two gestation and lactation cycles led to improved birth weights and pre-weaning growth of piglets.
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