The reproductive performance of anoestrous dairy cows following treatment with progesterone and oestradiol prior to the start of mating

References

• Anonymous . 1999 . CIDR Product Information Hamilton : Livestock Improvement Corporation, .
   Google Scholar
• Grainger , C , Wilhelms , GD and McGowan , AA . 1982 . Effect of body condition at calving and level of feeding in early lactation on milk production of dairy cows . Australian Journal of Experimental Agriculture and Animal Husbandry , 22 pp9-17
   Google Scholar
• Hanlon , DW . 1998 . “ Reproductive problems in the postpartum cow ” . In Proceedings of the 15th Annual Seminar of the Society of Dairy Cattle Veterinarians 209 – 17 . Palmerston North : Foundation for Continuing Education of the New Zealand Veterinary Association, .
   Google Scholar
• Hanlon , DW . 1995 . The use of oestradiol benzoate and progesterone to synchronise oestrus in dairy cattle Palmerston North : Massey University, . MVSc thesis
   Google Scholar
• Hayes , DP . 1998 . “ Reproductive performance of New Zealand herds ” . In Proceedings of the 15th Annual Seminar of the Society of Dairy Cattle Veterinarians 189 – 205 . Palmerston North : Foundation for Continuing Education of the New Zealand Veterinary Association, .
   Google Scholar
• Macmillan , KL . 1995 . “ Reducing the use of induced calving ” . In Proceedings of Ruakura Farmers Conference 36 – 41 . Hamilton : Ruakura Agricultural Research Centre, .
   Google Scholar
• Macmillan , KL , Taufa , VK , Day , AM and McDougall , S . 1995 . Some effects of using progesterone and oestradiol benzoate to stimulate oestrus and ovulation in dairy cows with anovulatory anoestrus . Proceedings of the New Zealand Society of Animal Production , 55 : 239 – 41 .
   Google Scholar
• McDougall , S . 1994 . Postpartum anoestrum in the pasture grazed New Zealand dairy cow Palmerston North : Massey University, . PhD thesis
   Google Scholar
• McDougall , S , Burke , CR , Williamson , NB and Macmillan , KL . 1995 . The effect of stocking rate and breed on the period of postpartum anoestrum in grazing dairy cattle . Proceedings of the New Zealand Society of Animal Production , 55 : 236 – 8 .
   Google Scholar
• Nation , DP , Macmillan , KL and Taufa , VK . 1997 . Efficacy of an anoestrous treatment for dairy cows is reduced if administered within three weeks of calving . Proceedings of the New Zealand Society of Animal Production , 57 : 228 – 30 .
   Google Scholar
• Rhodes , FM , Clark , B , Nation , DP , Taufa , VK , Macmillan , KL , Day , ML , Day , AM and McDougall , S . 1998 . Factors influencing the prevalence of postpartum anoestrus in New Zealand dairy cows . Proceedings of the New Zealand Society of Animal Production , 58 : 79 – 81 .
   Google Scholar
• Rhodes , FM and Morgan , SR . 1999 . Milk production and production worth of anoestrous dairy cows compared with their cycling herd mates . Proceedings of the New Zealand Society of Animal Production , 59 : 208 – 10 .
   Google Scholar
• Roche , JF , Austin , EJ , Ryan , M , O'Rourke , M , Mihm , M and Diskin , MG . 1999 . Regulation of follicular waves to maximize fertility in cattle . Journal of Reproduction and Fertility , 54 : 61 – 71 .
   Google Scholar
• SAS Institute Inc. 1989 . SAS/STAT User's Guide Version 6 Cary : SAS Institute Inc., .
   Google Scholar
• Stevenson , MA , Williamson , NB and Hanlon , DW . 1999 . The effects of calcium supplementation of dairy cattle after calving on milk, milk fat and protein production, and fertility . New Zealand Veterinary Journal , 47 : 53 – 60 .
   PubMed Web of Science ®Google Scholar
• Taufa , VK , Macmillan , KL , Nation , DP , Day , AM and Ashcroft , MJ . 1997 . The responses of lactating dairy cows treated for anoestrum to an oestradiol capsule and an oestradiol injection . Proceedings of the New Zealand Society of Animal Production , 57 : 241 – 241 .
   Google Scholar
• Camp , SD Van . 1991 . Understanding the processes of placental separation and uterine involution . Veterinary Medicine , 86 : 642 – 6 .
   Google Scholar
• Xu , ZZ and Burton , LJ . 1996 . Reproductive efficiency in lactating dairy cows Proceedings . of the New Zealand Society of Animal Production , 56 : 34 – 37 .
   Google Scholar
• Xu , ZZ and Burton , LJ . 1997 . Reproductive performance of postpartum anoestrous dairy cows treated with progesterone and oestradiol benzoate . New Zealand Veterinary Journal , 45 : 213 – 4 .
   PubMed Web of Science ®Google Scholar
• Xu , ZZ , Burton , LJ and Macmillan , KL . 1996 . Reproductive performance of lactating dairy cows following oestrus synchronisation with progesterone, oestradiol and prostaglandin . New Zealand Veterinary Journal , 44 : 99 – 104 .
   PubMed Web of Science ®Google Scholar
• Xu , ZZ , Burton , LJ and Macmillan , KL . 1997 . Treatment of postpartum anoestrous dairy cows with progesterone, oestradiol and equine chorionic gonadotrophin . New Zealand Veterinary Journal , 45 : 205 – 7 .
   PubMed Web of Science ®Google Scholar