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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.