Lambing Calculator

The lambing percentage distributions displayed in the lambing calculator are sourced from the Beef + Lamb New Zealand Economic Service Sheep and Beef farm survey.

Compare Lambing Percentage

Add your number of lambs tailed from ewes to compare your ewe Lambing Percentage.

The lambing percentage distributions displayed in the lambing calculator are sourced from the Beef + Lamb New Zealand Economic Service Sheep and Beef farm survey.

The lambing percentage is calculated as follows.

The number of lambs tailed from ewes on hand at 1 July that have been run with a ram. However note:

  1. Where ewes run with a ram are diagnosed as dry through scanning and sold, these are included in the ewes to ram tally. If these were excluded it would not be measuring the true ewe flock fertility. It would be including an element of management practice and overstate the lambing percentage and true flock fertility.
  2. Bought in in-lamb ewes are included in the ewes to ram tally.
  3. Sold in-lamb ewes are excluded from the ewes to ram tally.
  4. Lambs from hoggets are recorded separately in the Survey and are not included in the lambs tailed from ewes lambing percentage calculation.

The lambing percentage distributions displayed in the lambing calculator are sourced from the Beef + Lamb New Zealand Economic Service Sheep and Beef farm survey.

Data up to the spring of 2015 are actual lambing percentages from surveyed farms and are provisional for the spring of 2016 and estimated for 2017.

The spring 2017 benchmark data for lambing percentages will be updated from data collected in the Beef + Lamb New Zealand Economic Service New Season Outlook report to be completed in September 2018. The 2015 data will be finalised at that time.

The All Classes distributions are 'weighted averages' of individual Farm Class data to correctly portray a whole region or the New Zealand lambing percentage distribution. These allow you to evaluate where your lambing percentage result sits nationally, within your region and within a particular Farm Class. If there are insufficient observations within a Class and Region you will need to compare your farm with its whole Farm Class or your All Classes Region distribution.

The Farm Class descriptions are noted below and Table 1 shows the estimated number of commercial sheep and beef farms in each Class.

Table 1: Sheep and Beef Farm Survey 2015-16
Farm Class Estimated Farms
1 South Island High Country 215
2 South Island Hill Country 810
3 North Island Hard Hill Country 1,065
4 North Island Hill Country 3,640
5 North Island Intensive Finishing 1,275
6 South Island Finishing Breeding 2,505
7 South Island Intensive Finishing 1,290
8 South Island Mixed Finishing 495
Total All Classes 11,295

The eight farm classes are defined as follows.

  1. South Island High Country

    Extensive run country located at high altitude carrying fine wool sheep, with wool as the main source of revenue. Located mainly in Marlborough, Canterbury and Otago.
  2. South Island Hill Country

    Mainly mid micron wool sheep mostly carrying between two and seven stock units per hectare. Three quarters of the stock units wintered are sheep and one quarter beef cattle.
  3. North Island Hard Hill Country

    Steep hill country or low fertility soils with most farms carrying six to ten stock units per hectare. While some stock are finished a significant proportion are sold in store condition.
  4. North Island Hill Country

    Easier hill country or higher fertility soils than Class 3. Mostly carrying between seven and thirteen stock units per hectare. A high proportion of sale stock sold is in forward store or prime condition.
  5. North Island Intensive Finishing Farms

    Easy contour farmland with the potential for high production. Mostly carrying between eight and fifteen stock units per hectare. A high proportion of stock is sent to slaughter and replacement are often bought in.
  6. South Island Finishing-Breeding Farms

    A more extensive type of finishing farm, also encompassing some irrigation units and frequently with some cash cropping. Carrying capacity ranges from six to eleven stock units per hectare on dryland farms and over twelve stock units per hectare on irrigated units. Mainly in Canterbury and Otago. This is the dominant farm class in the South Island.
  7. South Island Intensive Finishing Farms

    High producing grassland farms carrying about ten to fourteen stock units per hectare with some cash crop. Located mainly in Southland, South and West Otago.
  8. South Island Mixed Finishing Farms

    Mainly on the Canterbury plains with a high proportion of the revenue being derived from grain and small seed production as well as stock finishing.

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