Supplementing treated anoestrous dairy cows with progesterone does not increase conception rates

References

• Bulman , DC and Lamming , GE . 1978 . Milk progesterone levels in relation to conception, repeat breeding and factors influencing acyclicity in dairy cows . Journal of Reproduction and Fertility , 54 : 447 – 458 .
   PubMedGoogle Scholar
• Drew , SB and Peters , AR . 1994 . Effect of buserelin on pregnancy rates in dairy cows . Veterinary Record , 134 : 267 – 269 .
   PubMedGoogle Scholar
• Lukaszewska , J and Hansel , W . 1980 . Corpus luteum maintenance during early pregnancy in the cow . Journal of Reproduction and Fertility , 59 : 485 – 493 .
   PubMedGoogle Scholar
• Macmillan , KL and Curnow , RJ . 1976 . The application of oestrus synchronisation in New Zealand dairy herds . Proceedings of the New Zealand Society of Animal Production , 36 : 50 – 57 .
   Google Scholar
• Macmillan , KL and Peterson , AJ . 1993 . A new intravaginal progesterone releasing device for cattle (CIDR-B) for oestrous synchronisation, increasing pregnancy rates and the treatment of post-partum anoestrus . Animal Reproduction Science , 3. : 1 – 25 .
   Google Scholar
• Macmillan , KL , Taufa , VK and Day , AM . 1986 . Effects of an agonist of gonadotrophin releasing hormone (Buserelin) in cattle. III. Pregnancy rates after a post-insemination injection during metoestrus or dioestrus . Animal Reproduction Science , 11 : 1 – 10 .
   Google Scholar
• Mann , GE , Merson , P , Fray , MD and Lamming , GE . 1998 . Conception rate following progesterone supplementation at second insemination in dairy cows . Journal of Reproduction and Fertility, Abstract Series 22, Abstract 47 ,
   Google Scholar
• Mann , GE , Lamming , GE , Robinson , RS and Wathes , DC . 1999 . The regulation of interferon-τ production and uterine hormone receptors during early pregnancy . Journal of Reproduction and Fertility Supplement , 54 : 317 – 328 .
   PubMedGoogle Scholar
• Munro , RK and Bertram , J . 1990 . Progesterone administered after insemination did not affect the fertility of cattle following a controlled breeding program . Australian Journal of Experimental Agriculture , 30 : 179 – 181 .
   Google Scholar
• Rhodes , FM , Clark , BA , Nation , D P , Taufa , VK , Day , ML , Day , AM , Macmillan , KL and McDougall , S . 1998a . 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 , Peterson , AJ , Clark , BA and Verkerk , GA . 1998b . Ovarian steroidogenesis of postpartum anoestrous cows following treatment with progesterone differs from cows which have resumed oestrous cycles . Proceedings of the Australian Society of Reproductive Biology , 29 : 35 – 35 .
   Google Scholar
• Rhodes , FM , Clark , BA , McDougall , S and Macmillan , KL . 1999 . Insemination at the second of two induced oestrous periods in anoestrous dairy cows increases conception rates to first service . New Zealand Veterinary Journal , 47 : 39 – 43 .
   PubMed Web of Science ®Google Scholar
• Robinson , NA , Leslie , KE and Walton , JS . 1989 . Effect of treatment with progesterone on pregnancy rate and plasma concentrations of progesterone in Holstein cows . Journal of Dairy Science , 72 : 202 – 207 .
   PubMed Web of Science ®Google Scholar
• Sheldon , IM and Dobson , H . 1993 . Effects of gonadotrophin releasing hormone administered 11 days after insemination on the pregnancy rates of cattle to the first and later services . Veterinary Record , 133 : 160 – 163 .
   PubMedGoogle Scholar
• Starbuck , GR , Darwash , AO , Mann , GE and Lamming , GE . “ The detection and treatment of post insemination progesterone insufficiency in dairy cows ” . In Fertility in the High Producing Dairy Cow , Edited by: Diskin , MG . Occasional Publication, British Society of Animal Science . In press.
   Google Scholar
• Thatcher , WW , Drost , M , Savio , JD , Macmillan , KL , Entwistle , KW , Schmitt , E , Sota , RL and Morris , GR . 1993 . New clinical uses of GnRH and its analogues in cattle . Animal Reproduction Science , 33 : 27 – 49 .
   Google Scholar
• Verkerk , GA and Meier , S . 1999 . The use of buserelin, a synthetic GnRH analogue, to elevate plasma progesterone concentrations and pregnancy rates in dairy cows treated for anoestrus . Proceedings of the New Zealand Society for Endocrinology , 42 : 240 – 240 .
   Google Scholar
• Xu , ZZ and Burton , LJ . 1997 . Reproductive performance of post-partum anoestrous dairy cows treated with progesterone and oestradiol benzoate . New Zealand Veterinary Journal , 45 : 213 – 214 .
   PubMed Web of Science ®Google Scholar