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CRT Catalogue Pull-out Feature : CRT Spring 2013 - Tech Update
www.crt.com.au There's always better value at CRT. Animal Health Tech Update -- Spring 2013 Issue 6 Spring 2013 Tech Update Improve the calving pattern to improve your bottom line It's simple math --- higher conception rates means more calves on the ground and more profit for you. But have you considered how long it's taking for your cows and heifers to become pregnant and how much the calving pattern influences your bottom line? Meat and Livestock Australia recommend that beef producers aim for 95% of cows calving in a 9 week period. This is made up of 65% calved in the first three weeks, followed by 20% and 10% in the following three week periods. The benefits of a tight calving pattern include heavier average weaning weights as there are less light calves, and heavier pre-breeding weights in heifers, which will increase their chance of cycling and conceiving at joining. A thirteen year study at the University of Nebraska1 found that the impact of calving pattern continued for generations. Heifers that were born earlier in the season were more likely to calve earlier themselves and have heavier calves at weaning. The calving pattern is influenced most by the length of time the bulls are in with the cows and the maximum number of times cows are given to conceive before they are culled from the breeding herd. However other factors affecting calving pattern include the number of cycles it takes before the cow conceives and the maintenance of early pregnancy. The goal is to have the majority of cows conceive on their first oestrus cycle (heat) but then also maintain the pregnancy to full term. So what can we do to increase the probability of cows and heifers conceiving on their first cycle and maintaining the early pregnancy? While many factors affect the fertility of cows and heifers and all need to be considered, one relatively new concept is increasing the trace mineral status of cows and heifers before joining with injectable trace minerals. Essential trace minerals, such as selenium, copper, zinc and manganese are involved in many important functions of the fertilisation (conception) process. Trace minerals also have important roles in embryo survival and development of the foetus. The roles of these trace minerals in reproduction often overlap; no single trace mineral is superior to the others and a combination will give the best result. So it's important to provide a timed and balanced trace mineral treatment pre-joining rather than just a single element at a random time. The importance of the trace minerals selenium, copper, zinc and manganese on conception and the calving pattern was demonstrated in a recent trial.2 Angus cross cows and heifers were divided We know Cattle We know Sheep In this issue: • Improve the calving pattern to improve your bottom line • Step ahead in your drench program with Sequel® • Extinosad® Dead fast, Dead easy • Avenge® kills lice and protects against re-infestation • The emerging cattle drench resistance problem We know Parasite Control Continued on page 2.
Crop Feature - Winter 2013
CRT Summer 2013 - Tech Update