115 Late-Breaking: Multi-Parity evaluation of performance effects of Methionine Hydroxy Analogue Bis-Chelated Zn, Cu and Mn on sows and offspring compared with similar levels of mineral in the glycinate form.

Abstract A study with Topigs TN70 gilts was conducted to compare organic sources of Zn, Cu, and Mn when provided in the methionine hydroxy analogue bis-chelated (MHAC) or glycinate (GLYC) form over 3 parities (P). From 7 weeks pre-breeding through the first gestation (pen housing), diets were supplemented with 80 mg/kg of Zn, 10 mg/kg of Cu, and 20 mg/kg of Mn in the respective forms. From the first through third lactation, the treatments provided 50 mg/kg of Zn, 10 mg/kg of Cu, and 20 mg/kg of Mn. GLYC diets were supplemented with DL-methionine to have equivalent levels of methionine compared to the MHAC treatment (using 100% Methionine equivalence from 2-hydroxy-4-(methylthio)butanoic acid; HMTBa provided by the MHAC). Gestation and lactation feed intake were managed to result in similar intake between treatments. Cross-fostering occurred within treatment within 24-h of birth. Litter size was standardized to 14.7 pigs/litter in P1 and P2 and 15.0 pigs/litter in P3. Locomotion score was evaluated at d-108 and weaning in P1, P2, and P3 using a 5 pt scoring system (0 = non-lame to 4 = severely lame). At insemination, 175 gilts per treatment were selected to remain in the study. Data was analyzed by ANOVA using GenStat® for Windows (21st edition). During the pre-breeding period, there was no effect (P >0.10) of mineral source on initial weight (143.5 kg), insemination weight (163.5 kg), backfat (BF) at insemination (14.1 mm), loin depth (LD) at insemination (63.5 mm). MHAC females gained 4.4 (P< 0.01), 4.6 (P< 0.05), and 4.8 kg (P< 0.001) more gestation weight in P1 through P3. MHAC sows in each parity had higher BF gain (P< 0.05; P2 and P3). MHAC P1 females had less LD loss (P< 0.05) and greater LD gain in P3 (P< 0.001). Total born and piglet birth weights were not different between mineral sources (P >0.10), indicating that the greater sow weight gain was a result of greater sow, not conceptus, gain. MHAC females lost 3 kg (P1; P< 0.10), 3.5 kg (P2; P< 0.05), and 3.6 kg (P3; P< 0.05) more weight in lactation. MHAC sows had numerically greater BF and LD loss in each parity with BF response significant in P2 (P< 0.01) and LD significant in P1 and P3 (P< 0.05). Both litter and piglet weaning weights were higher in P1 and P2 (P< 0.11) as well as P3 (P< 0.01) in the MHAC sows. Even with little lameness, locomotion score was lower for P1 females at both d-108 of gestation and at weaning. Results indicate differences exist between organic trace mineral sources on efficiency of maternal nutrient utilization and lameness in P1 females during gestation and subsequent promotion of milk production during 3 parities.