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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

Semen from 2 bulls was microencapsulated in an alginate poly-L-lysine matrix. Oestrus was synchronized in 417 primiparous Friesian and Jersey heifers with a CIDR-B intravaginal device and the heifers were inseminated with encapsulated semen or with diluted liquid semen (control) during pro-oestrus...

Author(s)
Vishwanath, R.; Nebel, R. L.; McMillian, W. H.; Pitt, C. J.; Macmillan, K. L.
Citation
Theriogenology, 1997, 48, 3, pp 369-376
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
Abstract

An artificial insemination programme for replacement dairy heifers is outlined. Consideration is given to grazing management, animal handling facilities, oestrus synchronization methods, oestrus detection techniques, management of heifers during natural mating following artificial insemination, and ...

Author(s)
Macmillan, K. L.
Citation
Proceedings of the Ruakura Farmers' Conference, 1991, No. 43, pp 36-41
Abstract

Oestrus was synchronized in 308 Friesian heifers, aged 15 months, using a subcutaneous ear implant (3 mg norgestomet implant for 10 days, followed by injection of 6 mg norgestomet and 5 mg oestradiol valerate) or an intravaginal device (1.9 g progesterone and 10 mg oestradiol, for 10 days, followed ...

Author(s)
MacMillan, K. L.; Taufa, V. K.; Morris, G. R.
Publisher
New Zealand Society of Animal Production, Hamilton, New Zealand
Citation
Proceedings of the New Zealand Society of Animal Production. Volume 56, 1996., 1996, 56, pp 347-349
Abstract

338 dairy heifers were given a progesterone-releasing intravaginal device (PRID) for 7 days. At PRID insertion heifers were also given a capsule containing 10 mg oestradiol benzoate (OB, Cidirol) and at PRID removal (day 0) they were given an injection of 1.25 mg PGF (Lutalyse). 131 heifers were...

Author(s)
MacMillan, K. L.; Taufa, V. K.
Citation
Proceedings of the New Zealand Society of Animal Production, 1997, 57, pp 238-241