Table 1.

Genotype and allele frequency of β-casein in Polish Red cows and bulls.

Group	N (%) of β-Casein Genotypes			Frequency of Alleles		p-Value
	A1A1	A1A2	A2A2	A1	A2
Cows	65 (36.7)	93 (52.5)	19 (10.7)	0.63	0.37	0.001
Bulls	3 (12.5)	14 (58.3)	7 (29.2)	0.42	0.58	0.001