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Table 2 Effect of Met:Lys ratio in the lactation diet on the performance of sows

From: Different dietary methionine to lysine ratios in the lactation diet: effects on the performance of sows and their offspring and methionine metabolism in lactating sows

Items Met:Lys SEM P-value
0.27 0.37 0.47 0.57   Linear Quadratic Feed
Basic information
 No. of sows 33 32 32 33     
 Culleda during lactation 4 1 1     
 Average body weight, kg 266.70 266.50 266.70 266.40 1.64    
 Average parity 4.40 4.10 4.00 4.38 0.07    
BW of sows, kg
 Day 110 of lactation 268.9 266.4 265.8 266.8 1.7 0.70 0.80 0.93
 Parturition 264.8 262.3 261.8 262.8 1.7 0.70 0.81 0.93
 Weaning 245.2 243.9 244.5 247.3 1.8 0.70 0.77 0.92
 Loss during lactation −19.6 −18.4 −17.2 −15.4 1.4 0.30 0.57 0.77
WEI of sows, d
 No. of sows 29 31 31 32     
 Within 1 week 4 5 4 5 0.13 0.97 0.99 0.93
 After 1 week 6 8 5 6 0.51 0.80 0.73 0.22
Estrus rate of sows, %b
 Within 1 week 89.66 77.42 93.55 90.63   0.66 0.86 0.22
 After 1 week 96.55 100.00 100.00 100.00   0.20 0.26 0.35
Sow backfat thickness, mm
 No. of sows 32 32 32 33     
 Day 110 of lactation 15.72 15.97 15.72 15.33 0.24 0.50 0.65 0.83
 Parturition 14.94 15.38 15.19 14.76 0.27 0.80 0.69 0.86
 No. of sows 29 31 32 33     
 Weaning 14.41 15.29 14.94 14.42 0.26 0.90 0.40 0.57
 Loss during lactation −0.59 −0.19 −0.25 −0.33 0.21 0.70 0.81 0.92
Lactation performance, kg
 Total milk yieldc 203.59 207.18 213.29 210.94 3.26 0.56 0.80 0.70
 Average daily milk yield 11.10 11.34 11.62 11.44 0.08 0.59 0.85 0.97
  1. SEM standard error of the mean, BW body weight, WEI weaning to estrous interval; Annotation: significance test for estrus rate of each group derived from the chi-square test; N indicates the number of sows
  2. aThe sows eliminated in each group for death, lameness, limb hoof disease and so forth during lactation
  3. bSignificance test for estrus rate of each group derived from the chi-square test
  4. cThe result of total milk yield during the whole lactation period is shown as Lsmeans and derived from the mixed procedure of SAS (8.0). The formula for the calculation of total milk yield is total milk yield (kg) = piglet ADG × litter size × lactating days × 4 [13]