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Oestrus synchronisation with a prostaglandin analogue: II. Systems in maiden heifers



Oestrus synchronisation with a prostaglandin analogue: II. Systems in maiden heifers



New Zealand Veterinary Journal 26(4): 96



Groups of maiden heifers (105 dairy and 199 beef) were treated twice with an 11-day-interval between injections of cloprostenol (0.5 mg/i.m.), and were then inseminated at 72 h and 96 h after the second injection. The pregnancy rate (PR) was 39% in both types of heifers. Significant PR differences between groups of heifers were largely due to differences in the proportion of non-cycling (anoestrus) animals within each group. Excluding these animals from the analyses increased PR's to the set-time inseminations by over 11%. An alternative treatment regime was used in a second series of trials. Entire bulls fitted with chin-ball mating harnesses were run with groups of heifers. Those heifers served in the first 11-day-period were subsequently injected with 0.5 mg of cloprostenol 6 days later and inseminated 72 h and 96 h after treatment. The second sub-group of heifers served in the second 11-day-period received the same injection-insemination sequence. Unmated heifers were examined at the same time as the second sub-group was injected. The PR among the 90 treated dairy heifers (from a total of 102 animals) was 69%, and 58% in 163 treated beef heifers. Almost all of the heifers not served by bulls in the pretreatment period were subsequently found to be anoestrous, pregnant to a previous (unrecorded) mating, or abnormal (freemartin).

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Accession: 000447052

Download citation: RISBibTeXText

PMID: 276772

DOI: 10.1080/00480169.1978.34506


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