Exciting New Mastitis Research

  Exciting New Mastitis Research By Dr David Beggs In the next few weeks, an important research project will commence at Warrnambool Veterinary. We have been contracted by Bayer Animal Health to trial a new treatment for mastitis. The trial is being run to assist registration of the new product in Australia. Because of this a large number of samples are required. The target number is 600 cases of mastitis in each treatment group. With each herd involved, and with each case of mastitis there will be a bit of paperwork involved so that everything undertaken as part of the trial can be documented. Milk samples will need to be collected for culture by Warrnambool Veterinary staff before treatment, and the treatment course will be also be commenced by one of our staff members. The upside for farmers who choose to be involved are: All treatment costs provided at no cost to the farmer; Mastitis sampling and culture provided at no cost to the farmer, and undertaken by Warrnambool Veterinary Staff; Mastitis sampling will occur before first treatment, and again around three weeks later to assess success of treatment; There will be a payment to the farmer for each case enrolled into the trial; and Dairy farmers will receive up to date knowledge on the mastitis organisms causing mastitis in their herds. We are very excited at being involved in this project, and any farmers who are as excited as us and would like to be involved are invited to contact us for further information. Several farmers have already expressed their interest, but because a large number of samples...

Sexed semen Fixed Time AI Trial 2015–2016 Results

  Sexed semen Fixed Time AI Trial 2015–2016 Results By Dr Jon Kelly Background In 2015/16 WVC conducted a trial on 19 herds and 1780 dairy heifers to determine if conception rates using frozen sexed semen could be improved by altering the timing of AI, when a 12 day Fixed Time AI program was used. The reason the trial was conducted was because in a previous project by WVC, fertility using frozen sexed semen was improved when AI was delayed more than 50hrs post CIDR pull. Also, the sexed semen processors have proposed that fertility using sexed semen may be increased by timing AI closer to ovulation than what is usually necessary with conventional(non-sexed) frozen semen. Method To investigate if this effect could be achieved in Dairy heifers, the following trial protocol was followed, with age, weight, Body Condition Score(BCS),heat at the time of AI as well as timing of AI assessed for their effect on fertility. The key to the trial was altering the time of AI on Day 12. This was done by having half of the heifers AI’ed at approximately 48hrs post CIDR pull(Day10), while the other half of the heifers were AI’ed 3 hrs later. If more than 1 sire was used, then the sires were also equally distributed between the early and late groups. Timing of AI was deliberately instructed to begin “approximately” 48 hrs from CIDR pull as this would ensure that insemination would occur over a wide range of times. This was achieved with AI occurring from between 47 – 53 hours post CIDR pull (Day 10). Logistically, this means AI was...