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Table 2 Effects of gestational Se supply and nutritional plane on mammary gland weight, cellularity, cell proliferation, and vascularity when necropsied after d 20 of lactation

From: Mammary gland growth and vascularity at parturition and during lactation in primiparous ewes fed differing levels of selenium and nutritional plane during gestation

  Se supply1 Nutritional plane2 P-value3
Item ASe HSe SEM4 RES CON EXC SEM5 Se Nut Se×Nut
Final BW, kg 55.9 57.3 1.3 48.5a 56.7b 64.6c 1.6 0.46 <0.001 0.56
Empty BW6, kg 45.9 47.73 1.25 39.1a 46.9b 54.4c 1.6 0.29 <0.001 0.31
Mammary gland, g 577.7 634.4 31.7 541.8 628.1 648.4 38.8 0.21 0.13 0.74
g/kg EBW7 12.6 13.5 0.8 14.0 13.4 11.7 0.9 0.42 0.19 0.78
DNA, mg/g 3.43 3.26 0.12 3.15 3.48 3.40 0.14 0.30 0.26 0.89
DNA, g 1.98 2.10 0.15 1.71a 2.23b 2.18b 0.18 0.54 0.09 0.96
RNA, mg/g 8.50 8.10 0.39 7.46 8.76 8.68 0.48 0.48 0.11 0.37
RNA, g 5.00 5.22 0.43 4.14a 5.59b 5.60b 0.52 0.71 0.09 0.69
RNA:DNA 2.49 2.49 0.09 2.39 2.52 2.56 0.11 0.99 0.53 0.13
Protein, mg/g 27.71 30.83 2.62 28.19 30.40 29.23 3.21 0.41 0.89 0.48
Protein, g 16.20 19.77 2.05 15.37 19.33 19.25 2.51 0.22 0.45 0.74
Protein:DNA 8.26 9.55 0.87 9.18 8.93 8.60 1.07 0.30 0.93 0.50
Proliferation, % 9.81 11.15 1.34 10.55 11.11 9.78 1.64 0.85 0.48 0.62
Vascular area, % 45.37 48.59 1.36 48.20 46.75 46.00 1.69 0.10 0.64 0.08
  ASe -- -- -- 48.01y 42.07z 46.03yz 2.48    
  HSe -- -- -- 48.38y 51.42y 45.96yz 2.29    
Alveoli per area7 0.54 0.52 0.03 0.45a 0.55b 0.59b 0.03 0.45 0.02 0.33
  1. a,b,c Within an item, main effect means differ (P ≤ 0.07).
  2. y,z Within an item, interactive means differ (P ≤ 0.09).
  3. 1Ewes fed 11.5 μg/kg BW Se (ASe) or 77.0 μg/kg BW Se (HSe) during gestation.
  4. 2Ewes fed 60% (RES), 100% (CON), or 140% (EXC) of nutrient requirements from d 40 of gestation to term.
  5. 3Probabilities of difference for Se supply (Se), nutritional plane (Nut), and the interaction (Se×Nut).
  6. 4Standard error means for ASe n = 21 and HSe n = 21.
  7. 5Standard error means for RES n = 14, CON n = 14, and EXC n = 14.
  8. 6Empty BW (EBW) = Final BW – digesta weight.
  9. 7Alveoli per area = (number of alveoli/total picture area) ×1,000.