Abstract
The aim of this study was to produce lambs through hormonal synchronization of oestrous cycle in 1.5 to >3.5 year-old ewes. From coastal region of Bangladesh, a total of 45 ewes were selected and grouped as treatment (n=30) and control (n=15) group. Based on synchronization protocol, the treatment group was again divided into sub-group A (n=15) and B (n=15). In subgroup A, the ewes were injected intramuscularly with 2 ml of Ovuprost(R) (PGF2α) 9 days apart from first injection whereas in sub-group B, the ewes were injected intramuscularly with 2.5 ml Ovurelin(R) (GnRH) once. Though, sub-group A showed higher oestrus (93.33%) than control (60%), the differences were not significant (p>0.05). The pregnancy rate in treatment group (80%) was significantly (p 0.05) different. The ewes between 2.6 and 3.5 yr aged showed comparatively higher oestrus and pregnancy than 1.5 to 2.5 and >3.5 yr. The mean litter size and average birth weight of lambs were 1.13±0.41, 1.46±0.31, 1.27±0.34 and 1.17±0.04, 1.32±0.03, 1.29±0.04 kg in control, sub-groups A and B, respectively. It was concluded that the hormonal synchronization of oestrous cycle in ewes of coastal region of Bangladesh increased pregnancy rate.
Published Version
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