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Table 1 Fertility rates of 5 month old TR4+/+ and TR4-/- males

From: The roles of testicular nuclear receptor 4 (TR4) in male fertility-priapism and sexual behavior defects in TR4 knockout mice

TR4 genotype Litters Offspring
  total per male total per litter
+/+ (N = 5) 22 4.4 168 7.6
-/- (N = 5) 2 NA 13 6.5
  1. Continuous mating with TR4+/+ females for 4 month NA, not applicable since only one male produced offspring in the TR4-/- group.