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Research Article| Volume 4, ISSUE 1, P39-44, June 1988

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Increasing Reproduction of Commercial Ewes by Fecundin® (Ovandrotone) Immunization1

DOI:https://doi.org/10.15232/S1080-7446(15)32329-9
Increasing Reproduction of Commercial Ewes by Fecundin® (Ovandrotone) Immunization1
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      Abstract

      A commercial flock of whiteface and blackface crossbred ewes (total of 672 ewes) was immunized with a commercial preparation of androstenedoine-7HSA in DEAE dextran adjuvant (trade name Fecundin®; Glaxo, Australia) in a two year trial. In Year 1, 100 ewes of each genotype were untreated while the remainder were immunized with Fecundin. In Year 2 the previous controls remained untreated while the previously treated ewes were randomized to receive either a booster or no additional treatment. Fecundin increased ovulation rate by .21 ova/ewe in Year 1 and by .17 ova/ewe in Year 2. Litter size of treated ewes was increased by .07 lambs/ewe in Year 1 (n.s.) and .15 lambs/ewe in Year 2 (P<.05). Second year ovulation rates and litter size were no higher for ewes receiving a booster than for those receiving Fecundin in Year 1 only. Uterine efficiency of twin-ovulating ewes averaged .78 with no difference between years or treatment groups. However, uterine efficiency of twin-ovulating whiteface ewes averaged .12 higher than for blackface ewes, resulting in an extra .09 lambs/ewe in Year 1 and .15 lambs/ewe (P<.05) in Year 2. Litter size increased with increasing body condition. No interaction was observed between body condition and Fecundin for any reproductive measure.

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      Article info

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      DOI: https://doi.org/10.15232/S1080-7446(15)32329-9

      Copyright

      © 1988 American Registry of Professional Animal Scientists. Published by Elsevier Inc. All rights reserved.

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