NCI APP breeding data comparison
NCI APP breeding data comparison of 4 inbred strains mated 1 female x 1 male versus
2 female x 1 male in the same size cage.
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NCI Breeding Data March 2011 - February 2012
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Strain
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C57BL/6NCr
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BALB/cAnNCr
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DBA/2NCr
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C3H/HeNCr MTV-
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Room 1
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Room 2
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Room 3
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Room 1
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Room 2
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Room 1
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Room 1
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1:1 Litter Average
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6.50
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5.70
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7.00
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6.80
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6.00
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5.20
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5.40
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1:2 Litter Average
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6.90
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6.20
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7.30
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6.20
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6.10
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5.40
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6.30
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1:1 PEI
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0.76
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1.01
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0.78
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1.20
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0.96
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0.57
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0.92
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1:2 PEI
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0.78
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0.86
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0.69
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0.99
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0.81
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0.71
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0.95
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1:1 % not reaching wean age
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0.050
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0.190
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0.050
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0.027
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0.015
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0.050
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0.028
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1:2 % not reaching wean age
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0.028
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0.140
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0.030
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0.015
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0.013
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0.033
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0.012
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Cage Size
11” L X 5 1/8” W X 5 ¾” H = 56.38 sq.in.
1:1 breeding - 1 female and 1 male per cage
1:2 breeding - 2 females and 1 male per cage
Litter Average = average number of pups born per litter per female
PEI = Production Efficiency Index