MANAGEMENT OF ANOESTROUS IN CROSSBRED CATTLE

Abstract

This study was conducted at two upazillas (Faridpur, Santhia) of Pabna District to investigate the prevalence of anoestrous and determine the comparative effectiveness between hormonal and non-hormonal treatment for anoestrous cows and heifers. Out of 230 animals, 48 (20.9%) some where as well animals were confirmed to be anoestrous through questionnaire and rectal palpation. All selected animals were divided into two classes (heifers and cows). All animals were treated by Triclabendazole (900mg) & levamisole (600mg) (Renadex, Renata limited, Bangladesh) @ 1 bolus per 75kg. According to the design of treatment, each class randomly allocated into 3 groups, in which Group I were treated with Nutritional supplements that include balance diet, VitADE (Vit-AD3E vet. Nutech limited, Bangladesh), Selenium (E-Sel, Square limited, Bangladesh and mineral, (DCP Plus, Opsonin Limited, Bangladesh). The animals of Group II were treated with a single dose (5 ml/animal) GnRH analogue (Gonadorelin 100 µg, Fertilon® , Techno Limited, Bangladesh) and the animals of Group III were treated with a single dose of 5 ml GnRH analogue (Gonadorelin 100 µg, Fertilon® , Techno Limited, Bangladesh) 2.5 ml PGF2α (Cloprostenol Na 250 µg, Ovuprost® , Renata Limited, Bangladesh) followed by after 7 days. The overall prevalence of anoestrous was 20.9 %. Prevalence of anoestrous was higher in cows (21.1 %) than heifers (20.5 %). The highest prevalence of oestrus response (85.7 %) in cows were shown in Group III (with 5 ml GnRH followed by 2.5 ml PGF2α). The response of estrous in heifers and cows after the treatment were 755.3 ± 31.9 and 675.7 ± 29.2 in Group I respectively. After the treatment, estrous was observed in heifers and cows that were 529.0 ± 1.6 and 478.4 ± 8.1 in Group II respectively. The onset of estrous (hrs) in heifers and cows after the treatment were 57.2 ± 0.7 and 50.9 ± 0.9 in Group III respectively. There were highly significant (P < 0.05) differences in the onset of estrous among different groups. The conception rate was less in hormonal treatment (1.4 ± 0.2 and 1.29 ± 0.2, respectively than the nutritional treatment (1.50 ± 0.2 and 1.29 ± 0.2, respectively) in both heifers and cows. Pregnancy rate was higher in hormonal treatment (75 % and 83.3 %, respectively) than the nutritional treatment (71.4 % and 81.8 %, respectively) in both heifers and cows. There was no significance (P < 0.05) differences in between conception and pregnancy rates were observed among different groups. It might be suggested that both nutritional and hormonal treatments were effective -for the treatment of anoestrous, however, cows were showed estrous earlier by the hormonal treatment than nutritional treatment.