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Manukau City, New Zealand

Bryan M.A.,VetSouth Ltd. | Bo G.,Institute Reproduccion Animal Cordoba IRAC | Mapletoft R.J.,University of Saskatchewan | Emslie F.R.,Bomac Laboratories Ltd.
Journal of Dairy Science

In seasonally calving, pasture-based dairy farm systems, the interval from calving to first estrus is a critical factor affecting reproductive efficiency. This study evaluated the effects of equine chorionic gonadotropin (eCG) on the reproductive response of lactating, seasonally calving dairy cows diagnosed with anovulatory anestrus by rectal palpation. Cows on 15 commercial dairy farms were selected for initial inclusion based on nonobserved estrus by 7d before the planned start of mating. All cows were palpated rectally and evaluated for body condition score and ovary score, and were included for treatment according to the trial protocol if diagnosed with anovulatory anestrus. All cows received a standard anestrous treatment protocol consisting of insertion of a progesterone device, injection of 100μg of GnRH at the time of device insertion, and injection of PGF2α at device removal (GPG/P4). Cows were randomly assigned to 1 of 2 groups (6d or 7d) for duration of progesterone device insertion. Within each of these groups, cows were further randomly assigned to receive either 400IU of eCG at device removal or to remain untreated as controls, resulting in a 2×2 arrangement of treatment groups: (1) 6-d device and no eCG (n=484); (2) 6-d device and eCG (n=462); (3) 7-d device and no eCG (n=546); and (4) 7-d device and eCG (n=499). Cows were detected for estrus from the time of progesterone device removal and were inseminated; those not detected in estrus within 60h after progesterone device removal received 100μg of GnRH and were inseminated at 72h. The primary outcomes considered were proportion of cows conceiving within 7d of the beginning of breeding (7-d conception rate; 7-d CR), proportion pregnant within 28d (28-d in calf rate; 28-d ICR), and days to conception (DTC). We found no significant differences between the 6- and 7-d insertion periods and found no 6- or 7-d insertion period × eCG treatment interactions. Inclusion of eCG into either length of GPG/P4 protocol increased 7-d CR (36.0 vs. 30.6%) and 28-d ICR (58.6 vs. 52.3%) and decreased median days to conception. The use of eCG in GPG/P4 breeding protocols will improve reproductive efficiency in seasonally calving, anestrous dairy cattle. © 2013 American Dairy Science Association. Source

Bryan M.A.,VetSouth Ltd. | Bo G.A.,Catholic University of Cordoba | Heuer C.,Massey University | Emslie F.R.,Bomac Laboratories Ltd.
Reproduction, Fertility and Development

In seasonally calving dairy areas, a critical index of efficiency and profitability is the ability to maintain a short annual calving spread. In essence, this means that all cows need to conceive within 90 days of calving. Anovulatory anoestrus (AA) is a major barrier to reproductive performance under these conditions and the successful treatment of AA is an important aspect of reproductive intervention. The present paper reviews regimens used to treat AA in New Zealand and reports on a large-scale field trial investigating the effects of equine chorionic gonadotrophin (eCG) within a proven efficacious treatment protocol. The administration of eCG at the time of removal of a progesterone-releasing device in an 8-day, oestradiol benzoate (EB)-based treatment protocol increased the percentage of cows in calf after 7 and 28 days of breeding. The interaction between cow age and treatment with eCG was significant, with cows over 5 years of age having higher conception rates (P ≤ 0.002) and 7 day in-calf rates (P ≤ 0.002) than cows on a standard 8-day treatment protocol without eCG. The addition of eCG to a standard 8-day EB/progesterone protocol can improve reproductive success in seasonally calving AA dairy cows.© 2010 IETS. Source

Bayer Aktiengesellschaft and Bomac Laboratories Ltd | Date: 2007-10-09

Veterinary preparations for the treatment of animal illnesses, namely milk fever, acidosis, wheat pasture poisoning, and metabolic disorders.

Bayer Aktiengesellschaft and Bomac Laboratories Ltd | Date: 2007-04-24

Veterinary preparations, namely mineral supplements for livestock.

Bayer Aktiengesellschaft and Bomac Laboratories Ltd | Date: 2005-01-18

Veterinary preparations to aid in the delivery of medicated tablets and capsules to companion animals; feed supplements for companion animals, namely, dogs and cats; medicated animal feed for companion animals. Foodstuffs for companion animals.

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