Effects of Intrauterine Infusion of Antibiotics and Quality of Mucous on Non Return Rate in Repeat Breeding Dairy Cows

Abstract

A study was conducted to observe the effect of intrauterine infusion of three antibiotics (viz. penicillin, gentamycin and streptopenicillin) and mucous quality on non return rate in post AI repeat breeding dairy cows. 101 cows were selected from Central Cattle Breeding Station and Dairy Farm (CCBSDF), Savar, Dhaka and Artificial Insemination (Al) centre in Chittagong metropolitan area during the period from July/2006 to December/2006. The experimental cows were divided into 4 groups (Group I, n= 21, Group II, n= 29, Group III, n= 26 and Group VI, n= 25). The first three groups received intrauterine infusion of penicillin,gentamycin and streptopenicillin, respectively, while Group TV was control. First dose of each antibiotic was infused 8 hours post AT then 2nd dose 24 hrs later of 1* infusion. Physical observation and rectal palpation have been done to detect heat within 18-24 days of treatments. The non-returned rate (%) was 51.72, 46.15 and 38.10 in group II, III and I, respectively, and 28.0 were in group IV. The same animals were divided into 4 groups depending on the quality of mucous: Group A (n=30, clear mucous), Group B (n=7, slight cloudy), Group C (n=2, slight frothy) and Group D (n=3, voluminous mucous). The non return rate (%) was 51.72, 50.0, 25.0 and 22.22 in group A, D, B and C, respectively. Comparatively higher non return rate was found in those cows treated with gentamycin compared to other antibiotics and cows discharged clear mucous than others. However, the result was not statistically significant.