Example results screens

The results from TANDEM are printed directly into a series of Excel spreadsheets. The results are divided up into those for the milking heifers, cows, and whole herd respectively. The tabular data helps to show the results of the 'What if' analysis with columns of information representing the different management scenarios.

You can extend TANDEM by conducting your own calculations in the surrounding cells, drawing on information held within the main tables.

Examples of tables and charts are shown below.

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Tabular outputs: All Year Round Calving This sheet displays the results for all animals in herd in year 5 This herd has a VWP of 45 days, an HDR or 90% and a conception rate to all services of 55%. This represents a very good level of fertility. What if? analysis - Whole herd   What happens if I change the following... Heat detection rate, % Voluntary waiting period, (days)   Deviation from actual value -10% Actual +10% -10 Actual +10       Culling summary       Animals in herd (mean) 99 100 100 99 100 100 Animals calving/yr 104 105 106 109 105 102 Animals served/yr 93 94 95 98 94 92 Animals culled for old age/yr 0 0 0 0 0 0 Other non-fertility culls/yr 10 10 11 11 10 10 Failure to conceive (FTC) culls/yr 3 2 1 1 2 2 Total culls/yr 13 12 11 12 12 12       Fertility       Services per conception 1.82 1.82 1.82 1.82 1.82 1.82 Calving to conception, days 81 76 71 67 76 86 Calving Index, days 362 357 352 348 357 367 FTC culling rate, % of animals calved/yr 3% 2% 1% 1% 2% 2% 100 day In calf rate, % of animals calved 74% 79% 82% 81% 79% 74% 200 day In calf rate, % of animals calved 87% 89% 89% 89% 89% 89%       FERTEX - Economics of herd fertility       Cost of FTC culling, £/yr/herd £2,305 £1,248 £634 £657 £1,248 £1,224 Semen cost £/animal conceiving £27 £27 £27 £27 £27 £27 Semen cost, £/herd £2,469 £2,523 £2,581 £2,652 £2,523 £2,474 FERTEX cost £/animal calved £53 £41 £34 £34 £41 £41 TANDEM FERTEX, £/herd/yr £4,774 £3,771 £3,215 £3,310 £3,771 £3,697       Lactation performance       Annual Milk yield/animal 7,315 7,265 7,295 7,517 7,265 7,215 Milk output, kg/herd/yr 724,154 726,450 731,325 746,686 726,450 721,458 Annual Milk value/animal £1,317 £1,308 £1,313 £1,353 £1,308 £1,299 Milk income, £/herd/yr £130,348 £130,761 £131,638 £134,404 £130,761 £129,862       Economic summary       Milk income - FERTEX, £/herd/yr £125,573 £126,990 £128,424 £131,094 £126,990 £126,165
	Graphical outputs: A range of standard charts are used to display the changing nature of the herd during the final year of the simulation. The split between milking cows and heifers is kept clear, as is the distinction between calving months. Use these charts to identify your herd's strengths and weaknesses. You may also find value in applying the milk production calculations to your quota management regime for your milk buyer.