Table 2 Mean ± SE peak concentrations of LH, androstenedione, testosterone, and total estrogens in Group I (14–16 months), Group II (9–12 months), and Group III (6–8 months) Holstein × Tharparkar bull calves

29.5 ± 8.49^a

23.4 ± 4.41^a

11.6 ± 9.91^a

3.01 ± 0.72^a

2.59 ± 0.71^a

0.31 ± 0.22^b

3.04 ± 0.29^a

0.93 ± 0.27^b

0.52 ± 0.17^b

21.8 ± 4.7^a

29.9 ± 14.4^a

26.0 ± 11.0^a