MANAGEMENT OF ANESTRUS COWS USING HORMONAL AND NON-HORMONAL DRUGS

Abstract

This study was conducted at two upazillas (Birganj and Kaharol) of Dinajpur Districts to investigate the prevalence of anestrus and determine the comparative effectiveness between hormonal and non-hormonal treatment for anestrus cows and heifers. Forty (40) cows were confirmed to be anestrus through questionnaire and rectal palpation. All cows were divided into pre-partum heifers and post-partum cows. According to the design of treatment, again each group randomly allocated into 3 groups, in which Group I, (Nutritional supplement as balance diet, Appetizer, Vitamin ADE, Group II (a single dose of 2.5 ml GnRH analogue (Gonadorelin 100 µg, Ovurelin, Renata Limited), Group III (a single dose of 2.5 ml GnRH analogue (Gonadorelin) and 3ml PGF2α (Cloprostenol). We found that the overall prevalence of anestrus was 20%. Incidence of anestrus was high in post-partum cow (20.16%) than that of the pre-partum heifers (19.74%). Results found that the highest incidence of estrus (83.3%) in postpartum cows were achieved with treatment of cows with 2.5 ml GnRH followed by 3 ml PGF2α.The incidence of estrus in pre-partum heifers and post-partum cows were respectively 75.0% and 66.0%, respectively after 2.5 ml GnRH injection. On the other hand, the mean intervals between treatments to the 1st estrus (onset of estrus) were significantly shorter (P < 0.05) in group II and III than that of group 1 (52.25 ± 12.78, 24.00 ± 6.93, vs. 583.11 ± 44.27 hours, respectively) in case of pre-partum heifers. The mean intervals than that of group I (74.67 ± 1.33, 365.94 ± 58.59. vs. 590.40 ± 58.59 hours, respectively). There is no significance differences in service per conception and pregnancy rate were observed among different groups. There was no significant variation in service per conception rate among the all treated groups, therefore, more than one insemination is required in both pre-partum heifers and post-partum cows. It might be suggested that both nutritional and hormonal treatment is effective -for the treatment of anestrus.