Roles of hCG in Advancing Follicular Growth to Ovulation after Concurrent Injections of PGF_𝟐𝛼 and GnRH in Postpubertal Holstein Heifers Bearing a CL

Table 2

Means and standards errors for progesterone concentrations in ovulating heifers by treatment and by day (ng/ml).

Treatment	𝑁	Day-7	Day 0*	Day 2	Day 7
PGF	11	7.19±1.68^aɛ′	7.03±0.96^aɛ′	2.50±0.77^a£	5.65±0.83^abɛ′£
PGF + GnRH	11	6.37±1.17^aɛ′£	8.96±1.48^aɛ′	3.99±1.00^a£ γ	3.03±0.71^aγ
PGF + GnRH + hCG	11	5.72±1.18^aɛ′£	6.34±1.29^aɛ′£	3.78±1.34^a£	9.04±1.85^bɛ′

^a,bMeans within the same column lacking a common superscript differ (𝑃<.05)
^ɛ′,£,γMeans within the same row lacking a common symbol differ (𝑃<.05)
𝑁: Number of heifers
*Injection of PGF_2𝛼.