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Abstract
The objective of this study was to evaluate the efficacy of four different treatment regimens for repeat breeder dairy cattle with antibiotic and hormonal. The study was conducted in 50 apparently healthy crossbred repeat breeding dairy cows and divided in to five groups with 10 animals each. Animals of group 1 were administered 2 ml of hydroxyl progesterone i/m administered on 4 th day of estrum after 1 st insemination. Animal in group 2, were administered 60 ml of diluted cephalixen intra uternally immediately after the first time artificial insemination. Animals in group 3 and 4 were administered i/m 1500 IU human chronic gonadotrophin and i/m 10 mg GnRH analogue respectively, immediately after first insemination. All the 5 groups’ animals were re-inseminated at interval of 12 hrs after the first insemination. The group 5 animals were inseminated without any hormone or antibiotic therapy and were kept as control for the various treatments. Pregnancy diagnosis was carried out in all groups at 60 days after AI by per rectal examination. Analysis of data showed that there was a significant lower in duration of estrum in the treatment compared to control group except group 2. The conception rate in groups 1 to 5 was 40; 40; 50; 30 and 30 per cent respectively. A maximum of 50 per cent conception rate was observed in group 3 repeat breeder dairy cows. All groups were re-inseminated at 12 hrs interval for increasing the conception rate in repeat breeder dairy cows with prolonged oestrum.
Highlights
Repeat breeding has long been considered as one of the important reproductive disorders in dairy cattle and its incidences are varies among different management systems, environments and regions
Mathew et al (2013) reported that treatment with human Chorionic gonadotrophin (hCG) or GnRH analogue at the time of insemination affected the duration of estrum
On 11th day of cycle, palpation of ovary indicated functional CL were present in all treatment groups where as in control group animals, only 7 out of 10 (70%) indicated presence of functional CL
Summary
Repeat breeding has long been considered as one of the important reproductive disorders in dairy cattle and its incidences are varies among different management systems, environments and regions. GnRH or human Chorionic gonadotrophin (hCG) administration at the time of insemination favours LH surge, which results improved conception rate. Progesterone or intrauterine antibiotic administration prevents the early embryonic mortality, which results in improved conception rate. Four therapeutic approaches viz, progesterone, intrauterine antibiotic, human chorionic. IJAVST – An Open Access Journal (ISSN 2320-3595). Gonadotrophin and GnRH analogue were used, following artificial insemination in repeat breeding dairy cattle and their efficacy and pregnancy rate were compared
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