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Oestrus synchronisation with a prostaglandin analogue. III. Special aspects of synchronisation



Oestrus synchronisation with a prostaglandin analogue. III. Special aspects of synchronisation



New Zealand Veterinary Journal 26(4): 104-108



Two groups of lactating dairy cows in each of 4 dairy herds were injected with either 0.5 mg (219 cows) or 0.3 mg (118 cows) of cloprostenol. The first group of cows were injected from day 6 to day 17 of the oestrous cycle (day O-oestrus) and the second group from day 6 to day 12. The four herds were selected specifically because oestrus-detection procedures were thorough and reliable. Of the cows receiving the 0.5 mg dose rate, 54.3% were observed in oestrus within 4 days of treatment. The remainder were in groups which were: (i) in oestrus from 5 to 10 days post-treatment (20.5% with prolonged response intervals), and 11 to 20 days post-treatment (15.5% with unaltered cycle lengths); or (ii) experienced a "silent oestrus" in the immediate post-treatment period and either did not show oestrus for a further 3 weeks (6.4% in oestrus from 21 to 29 days post-treatment) or conceived to a single set-time insemination 72 h after treatment (0.9%). Use of the lower dose rate resulted in fewer cows being observed in oestrus within 72 h (43.8% and 31.4%) and a corresponding rise in the percentage experiencing a "silent oestrus" and returning to service (6.4% and 13.6%) or conceiving to set-time insemination (0.9% and 3.4%). Most of the unaltered cycle lengths occurred with cows being treated on day 6 of the oestrous cycle. The pregnancy rate for the 171 cows observed in oestrus within 4 days of treatment and inseminated at 72 h, or 72 h and 96 h, was 57.3%. Records from this trial, as well as previous trials in which cows were injected with 0.5 mg of cloprostenol, showed that 446 of 524 cows (85%) injected at from day 6 to day 17 of the oestrous cycle were observed in oestrus within 5 days (144 h) of treatment. Among these 446 cows, the interval to post-treatment oestrus was influenced by the stage of the cycle at injection. Whereas 89% of the oestrous responses in cows treated on days 6-9 were observed within 72 h of injection, the comparable figures for cows treated on days 10-13 and days 14-17 were 48% and 70% respectively.

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Accession: 000447053

Download citation: RISBibTeXText

PMID: 276764

DOI: 10.1080/00480169.1978.34507


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