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Stage of Breeding Affected
____________________________________________________________
Proven or Suspected Factors
Puberty
After Weaning
After Service
Insufficient male stimulation
+a
+
−b
Housing and social environment
−
High ambient temperature
Season of year (summer/fall)
Photoperiod
?c
Genotype
Nutrition
Short lactation
Large litter reared
Adapted, with permission, from Meredith MJ, Pig News and Information 5, 1984, published by CAB International, Wallingford, Oxon, UK.
a Effect has been demonstrated
b No evidence for effect
c Effect uncertain
