Vol. 11, Issue 10 (2022)

A study was conducted to evaluate the efficacy of GnRH treatment in repeat breeder cattle as single dose at the time of AI (T-1), single dose after 12 days of AI (T-2) and two doses, both at the time of AI and 12 days after AI(T-3) as compared to the no treatment group (T-4). Out of 158 animals screened, 32 healthy animals in the age group of 6 to 8 years with atleast 2 to 3 calvings were selected. Repeat breeder animals with history of more than three services were selected and White side test (for subclinical infection) was performed on the day of estrus to rule out any subclinical infection. GnRH [6] injection (Gynarich, 2.5 mL, i/m) was administered in the study. Blood samples were collected on day of insemination, day 12th, day 20th and day 40th for assay of progesterone to ascertain pregnancy. The highest conception rate was observed in T-1 group (75%) followed by T-3% (62%) with T-2 and T-4 showing same conception rates (37.5%). The study revealed that single dose of GnRH at the time of AI is best and economical to treat the repeat breeder syndrome in cattle.

Highlights: Single dose of GnRH at the time of AI is economical for treating repeat breeder cattle.