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Table 6 Exploratory analysis of dietary betaine on subsequent reproductive performance during summer months (Exp. 1)c

From: Sow performance in response to natural betaine fed during lactation and post-weaning during summer and non-summer months

ItemBetaine in lactation diets, %SEMP-valuesd
000.20.2Betaine lactationBetaine post-weaningInteraction
Betaine in post-weaning diets, %
00.200.2
Parity 1, n39444442    
 Days to estrus5.786.827.805.190.9600.8430.4150.061
 Farrowed:weanede0.9230.8410.8180.8330.0540.3270.5550.328
 Total pigs born12.32a,b13.82a13.40a,b12.18b0.5980.6380.8210.025
 Pigs born alive11.61b13.33a12.93a,b11.38b0.5980.5990.8880.007
Parity 2 and 3, n71717172    
 Days to estrus7.215.697.166.660.8150.5690.2160.526
 Farrowed:weanede0.9290.9150.9150.8470.0350.2450.2450.444
 Total pigs born13.4213.2013.4113.010.5410.8480.5500.864
 Pigs born alive12.5812.5612.8512.250.5150.9690.5210.540
Parity 4, 5 and 6, n51484848    
 Days to estrus5.285.566.254.510.6850.9570.2420.107
 Farrowed:weanede0.9610.8540.9160.8960.0410.9770.1270.303
 Total pigs born14.1512.9015.3714.020.5850.0260.0140.927
 Pigs born alive13.0712.0613.5912.880.5520.1780.0840.768
  1. a,bMeans with different superscripts differ (P ≤ 0.05)
  2. cValues represent least squares means of n sows
  3. dThe statistical analysis tested for main effects of betaine supplementation during lactation and/or post-weaning, and their interaction. The group of placement (1 to 30) was used as the random effect in the analysis of total pigs born and pigs born alive
  4. eSows that were weaned and farrowed regardless of the day that were bred