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Animal Science Database

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Abstract

The Phantom Cow Syndrome is a major impediment to achieving compact conception patterns in Victorian herds. Some inseminated cows fail to return for a further insemination even though they are not pregnant because the corpus luteum formed following insemination is maintained for an extended period. ...

Author(s)
Pino, C. S.; Macmillan, K. L.; Anderson, G. A.
Publisher
New Zealand Society of Animal Production, Hamilton, New Zealand
Citation
Proceedings of the New Zealand Society of Animal Production, 2006, 66, pp 325-328
Abstract

Treatments designed to synchronize luteolysis, preovulatory follicular development, and ovulation, and resynchronize oestrus after a first AI have improved responses to synchronization treatments. Protocols based only on the use of PGF result in variable onset of oestrus. Concentrations of...

Author(s)
Cavalieri, J.; Hepworth, G.; Fitzpatrick, L. A.; Shephard, R. W.; Macmillan, K. L.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2006, 65, 1, pp 45-64
Abstract

Objective: To compare the effects of two doses of estradiol benzoate (ODB) administered as part of a treatment designed to resynchronize returns to oestrus on the reproductive performance of cows in a controlled breeding programme. Design: Cohort study. Procedure: Lactating dairy cows on two farms...

Author(s)
Cavalieri, J.; Hepworth, G.; Eagles, V. E.; Macmillan, K. L.
Publisher
Australian Veterinary Association, Artarmon, Australia
Citation
Australian Veterinary Journal, 2003, 81, 6, pp 348-354
Abstract

This study investigated the hypothesis that a reduction in submission rates at a resynchronised oestrus is not due to the resynchrony treatment involving intravaginal progesterone releasing devices (IVDs) and oestradiol benzoate (ODB) but is associated with artificial insemination (AI) at the first ...

Author(s)
Cavalieri, J.; Rabiee, A. R.; Hepworth, G.; Macmillan, K. L.
Publisher
Elsevier, Amsterdam, Netherlands
Citation
Animal Reproduction Science, 2005, 90, 1/2, pp 39-55
Abstract

One aim of this study was to compare the reproductive performance of cows and heifers when resynchronizing returns to oestrus for a second insemination by treating with an intravaginal progesterone-releasing device (IVD) for 7 or 8 d when estradiol benzoate (EB) was administered at the start of...

Author(s)
Cavalieri, J.; Hepworth, G.; Smart, V. M.; Ryan, M.; Macmillan, K. L.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2007, 67, 4, pp 824-834
Abstract

Objective: To compare the sensitivity and positive predictive value of four methods for detection of oestrus in dairy cows with resynchronized oestrous cycles. Procedure: Oestrous cycles in cows in three herds were synchronized for a first round of artificial insemination (AI) and then...

Author(s)
Cavalieri, J.; Eagles, V. E.; Ryan, M.; MacMillan, K. L.
Publisher
Australian Veterinary Association, Artarmon, Australia
Citation
Australian Veterinary Journal, 2003, 81, 7, pp 422-425
Abstract

An oestrus synchronization protocol was developed for use in lactating dairy cows using PGF, GnRH, and estradiol cypionate (ECP). In experiment I, lactating dairy cows received two injections of PGF (on days 0 and 11) (PP; n=10) or two injections of PGF (days 0 and 11) and 100 µg of GnRH on...

Author(s)
Borman, J. M.; Radcliff, R. P.; McCormack, B. L.; Kojima, F. N.; Patterson, D. J.; Macmillan, K. L.; Lucy, M. C.
Publisher
Elsevier Science B.V., Amsterdam, Netherlands
Citation
Animal Reproduction Science, 2003, 76, 3/4, pp 163-176
Abstract

Calving records were obtained from 1617 heifers in 26 herds which were part of the GenermateTM synchrony programme. Each heifer was fitted with a controlled internal drug-releasing (CIDR) device which released progesterone over a 10-day period. Oestradiol benzoate (10 mg) was given at the time of...

Author(s)
Cliff, S. C.; Morris, G. R.; Hook, I. S.; MacMillan, K. L.
Citation
Proceedings of the New Zealand Society of Animal Production, 1995, 55, pp 70-71

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