Refurbishment rate
Replacement rate (abbreviation RMR , whether inventory replenishment rate ) denotes the fraction of the heifers of stocks which are used for obtaining the Durchschnittskuhbestandes.
detection
The remounting rate is calculated as follows:
Dairy farming
Consequences of the remounting rate
Together with other factors such as animal losses during rearing or the time between calving, the animal owner can determine whether he or she can cover the need for animals from his own offspring. With a number of cows of 500 cows, a remounting rate of 35%, a calving interval of 405 days, a first calving age of 26 months and a 10–15% loss in rearing, this results in an annual reduction in the number of cows by 1%. So after 5 years there are only 475 instead of 500 cows from our own offspring in the barn. If you manage to shorten the first calving age by 2 months and reduce the replacement rate by 5 percentage points, you can already give around 60 animals annually to other farms for breeding or fattening.
Causes of remounting
The main causes in cows are above all sterility , udder diseases and problems with the feet and legs , especially the hooves. In most cases, however, various factors play a role, metabolic disorders such as ketosis also have a major influence on the overall condition of the animal.
Guide values & decision factors
High replacement rates of 50% generate proportionally high rearing and feed costs for new young animals. At the same time, it is no longer possible to sell large quantities of calves or heifers to other farms. With a usage period of only 2 lactations, the cost of reassembly can amount to 8 cents per kilogram of milk.
However, an extremely small amount of remounting is also not desirable, since the milk yield of a cow decreases again in the course of its life. In addition, breeding advances cannot be used. In the case of herd production over 8000 kg milk per cow and year, the replacement rate should not exceed 35%.
Remounting in breeding sows
The replacement rate is also of great importance for breeding sows.
If the replacement rate is set too low, the sows are too old. This increasingly leads to decreasing litter sizes, increasing losses of suckling piglets and often to weak piglets. The advantage here is that in economically difficult times the expenses for buying gilts can be postponed a little.
As with dairy cows, a high RMR is mostly due to health problems in the herd. In some cases, sows often drop out after the first or second litter, i.e. well before they reach their existing life performance potential.
As a rough guide, around 40 percent of the breeding sows in the herd should be replaced by gilts each year.
Individual evidence
- ↑ poratl-rind.de key figures on the dairy industry
- ↑ Innovationsteam.net (PDF; 2.9 MB)
- ↑ a b Deutsche Tiernahrung Cremer ( Memento of the original from June 23, 2006 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. (PDF; 1.7 MB)
- ↑ a b Competence Center Organic Farming Lower Saxony ( Memento of the original from May 20, 2011 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. (PDF; 126 kB)
- ↑ landwirt.com; Remounting rate in breeding sows
