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KMID : 1005220120270040223
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Journal of Embryo Transfer
2012 Volume.27 No. 4 p.223 ~ p.228
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Use of Two Estrus Synchronization Protocols and Their Success on Pregnancy in Zebu and Crossbred Heifers at Char Areas of Bangladesh
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Ghosh Tapas
Paul Ashit Kumar
Talukder Anup Kumar
Alam M. Golam Shahi
Bari Farida Yeasmin
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Abstract
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This study was designed to adopt two estrus synchronization protocols in zebu and crossbred heifers and their effects on pregnancy rate after timed artificial insemination (TAI). A number of 120 cyclic heifers were allotted for two different treatment groups and one control group. Heifers under protocol A were injected with GnRH at first day followed by a single dose of PGF2α at Day 11 and injection of GnRH at the day of AI; and heifers belonged to protocol B were treated with GnRH, two PGF2α injections at 11 days apart and injection of GnRH at AI. AI was done at fixed time (within 72~96 hours after PGF2α injection) in both protocols and pregnancy was confirmed by rectal palpation on 80~120 days of post AI. In control group; local heifers were conceived higher (30%) proportion than that of crossbred heifers (25%; p<0.05). In protocol A, the local breed were conceived higher (38.9%) proportion compared with crossbred (25%; p<0.05). In protocol B, local breed heifers were conceived higher (38.9%) proportion compared with crossbred heifers (33.3%; p<0.05). The overall pregnancy rate in protocol A and protocol B was 33.3% and 36.6%, respectively. The proportion of pregnancy rate of local heifers (38.9%; Protocol A) was significant (p<0.05) in comparison with local heifers (30%) in control group (p<0.05). The overall pregnancy rate between pooled control group (28.3%) and treatment group (35%) was significantly (p<0.05) differ from each other's. Results of present study concluded that estrus synchronization followed by fixed time AI could be applied for higher pregnancy rate in zebu and crossbred heifers.
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KEYWORD
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estrus synchronization , pregnancy rate , zebu and crossbred heifer
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