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Aim:The aim was to evaluate the estrus response, incidence of accessory corpus luteum formation and fertility following different hormonal protocols in repeat breeding crossbred cows.Materials and Methods:This study was carried out on 24 repeat breeding crossbred cows allotted into four groups. Cows of Group I was not given any treatment, Group II was treated with gonadotropin-releasing hormone (GnRH) injection on day 6 post-estrus, Group III was treated with Ovsynch protocol, and Group IV was treated with Ovsynch based GnRH treatment. Estrus responses such as duration, onset, percentage, and intensity of estrus were recorded during the study. The incidence of accessory corpus luteum was recorded per rectally on day 7 after first and additional GnRH of Ovsynch treatment. The conception rate for all groups was calculated by the absence of estrus and on day 45 after artificial insemination (AI) per rectum. Serum samples were collected at AI and day 12 post-AI in Group I and II. Serum samples were also collected at GnRH, Prostaglandin F2α (PGF2α), timed AI (TAI) and day 12 post-TAI in Group III and IV.Results:Ovsynch and Ovsynch based GnRH treatments are resulted in 100.00% induction of estrus after the PGF2α injection. Onset of induced estrus after the PGF2α injection for Group III and IV was recorded as 48.750±0.713 and 51.472±1.989 h, respectively, and it was not significant. There was no significant difference in duration of estrus among the groups. The incidence of intermediate estrus intensity was found to be highest. All the cows showed the incidence of formation of accessory corpus luteum subsequent to GnRH treatment on day 6 of the estrous cycle in Group II, III, and IV. The conception rate was 0.00%, 16.67%, 50.00%, and 50.00% in Group I, II, III, and IV, respectively.Conclusion:Ovsynch and Ovsynch based GnRH treatments initiated on day 6 of estrous cycle capable of responding with a higher percentage of ovulation and formation of accessory corpus luteum which helped in higher conception rate over single post-AI GnRH treatment in repeat breeders. These treatments responded with better estrus response but did not significantly improve estrus intensity.

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Present study was undertaken to characterize Staphylococcus spp. associated with respiratory tract infection in small ruminants. A total of 139 bacterial isolates were recovered from clinically sick and apparently healthy small ruminants. The prevalence rate of Staphylococcus spp. in sick and healthy animals was 44.94 and 24% respectively. The sensitivity pattern of selected antibiotics was similar in both clinically sick and apparently healthy animals except streptomycin and penicillin-G. PCR assay was standardized for the detection of pathogenic genes of Staphylococcus spp. viz. clfA and spa. Among 34 random isolates selected, the prevalence rate of clfA and spa gene was 79.41 and 58.82% respectively indicating their pathogenic potential. In conclusion, Staphylococcus spp. was found to be one of the highly prevalent organism in respiratory tract infections.

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