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Table 1 Effects of gestational Se supply and nutritional plane on mammary gland weight, cellularity, cell proliferation, and vascularity when necropsied after parturition

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 54.5 54.9 1.4 46.3a 54.0b 63.8c 1.7 0.86 <0.001 0.79
Empty BW6, kg 47.8 47.9 1.3 40.2a 47.2b 56.2c 1.7 0.96 <0.001 0.87
Mammary gland, g 754.1 850.7 46.9 715.3a 773.5ab 918.4b 59.6 0.15 0.05 0.55
g/kg EBW7 15.9 18.2 1.1 18.0 16.7 16.4 1.4 0.14 0.69 0.33
DNA, mg/g 3.59 3.59 0.24 3.63 3.62 3.53 0.30 0.98 0.96 0.94
DNA, g 2.67 3.00 0.22 2.58 2.79 3.14 0.28 0.30 0.36 0.48
RNA, mg/g 5.49 5.42 0.38 5.60ab 6.21a 4.56b 0.48 0.90 0.04 0.90
RNA, g 3.89 4.55 0.30 3.92 4.57 4.17 0.39 0.13 0.46 0.78
RNA:DNA 1.57 1.52 0.09 1.57ab 1.71a 1.36b 0.11 0.67 0.07 0.41
Protein, mg/g 29.37 25.64 2.64 25.02 27.72 29.79 3.36 0.32 0.59 0.25
Protein, g 22.75 21.54 2.27 18.16a 21.16ab 27.12b 2.89 0.71 0.09 0.10
Protein:DNA 8.80 7.98 1.03 7.86 7.76 9.54 1.32 0.57 0.53 0.51
Proliferation, % 3.38 2.14 0.40 1.63 2.96 3.69 0.51 0.02 0.03 0.07
 ASe -- -- -- 1.82y 3.06y 5.27z 0.75    
 HSe -- -- -- 1.44y 2.86y 2.11y 0.68    
Vascular area, % 48.74 51.27 1.08 50.78 49.47 49.77 1.35 0.09 0.76 0.33
Alveoli per area7 0.57 0.53 0.02 0.52 0.55 0.59 0.02 0.23 0.10 0.46
  1. a,b,c Within an item, main effect means differ (P ≤ 0.05).
  2. y,z Within an item, interactive means differ (P ≤ 0.02).
  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 = 19 and HSe n = 19.
  7. 5Standard error means for RES n = 12, CON n = 14, and EXC n = 12.
  8. 6Empty BW (EBW) = Final BW – digesta weight.
  9. 7Alveoli per area = (number of alveoli/total picture area) ×1,000.