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  • Introduction
  • Ayrshire
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  • Introduction
  • Ayrshire
  • British Friesian
  • Brown Swiss
  • Guernsey
  • Holstein
  • Island Jersey
  • Montbeliarde UK
  • UK Jerseys
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INTRODUCTION

The National Bovine Data Centre (NBDC) collates the completed lactation results recorded in the United Kingdom from a range of ICAR approved organisations (see “Sources”). The results used for the performance statistics in this section are gathered exclusively for animals registered with the appropriate dairy cattle breed society.

 

COMMENTARY

Throughout the period 2015 to late 2017, many UK dairy farms experienced a period of depressed milk prices below the long-term average (source: AHDB UK, GB & NI Farmgate Prices). This did not encourage producers to manage for higher lactation milk yields. From late 2017 and into 2018 however farmgate process improved closer to the 5-year average. The impact of this across most breeds can be seen in the charts for annual average lactation yields. Where during 2015-2017 yields stagnated or even declined slightly. While over the 2018 production year yields have improved by around 1-2% for most major UK breeds.

Over the same periods, by contrast, overall health and fertility measures have shown consistent improvements. Particularly lactation average Somatic Cell Counts (SCC) and overall Calving Intervals. Most herds and breeds have produced year on year improvement in those two key measures. Except perhaps where a relatively small population size means some temporary reversals are apparent among a generally improving longer term trend. Influenced by a relatively small number of animals within those populations.

Particularly among the Holstein-Friesian and Ayrshire populations, which collectively account for over 95% of the data collected for these results, the sustained improvements in Calving Intervals (as a measure of fertility) are most marked. These are visible in the charts for annual trends in Calving Interval in the following sections. In all three population sectors Calving Intervals have improved from peaks around 2008-2009 to levels approaching 400 days, last seen around the turn of the millennium. Geneticists and pundits agree that these trends are at least in part, influenced by the introduction of daughter fertility indices into to the overall genetic index scores produced for breeding bulls. Which have made it increasingly difficult for a bull transmitting poor daughter fertility to achieve a top overall score. Along with the efforts of breeders and genetic source suppliers to eliminate bulls with poor daughter fertility from their studs.

 

Lactation Criteria

To be selected for inclusion in these analyses, lactation records must meet selected qualifying criteria.
Each lactation must:

  • Have a minimum of 5 genuine sample test results, analysed for constituents.
  • Have lasted a minimum of 200 days from calving,
  • Have ended the lactation or completed the 305th day within the 12 months up to 30th September of the year quoted.
  • Include production up to and including the 305th day of lactation, but not beyond.
  • Excluding animals culled prematurely (e.g. for reasons of disease control) where the lactation was ended when the animal was recorded as moved directly for slaughter below 250 days.
  • Only those lactations with a valid Cell Count result are included in the SCC aggregates.
  • Calving Intervals are included in averages where the period between successive pairs of calving dates falls into the range 280 to 730 days. This excludes very premature calvings where the event has started a fresh lactation record and animals with extended intervals due to embryo transfer activity.

 

SOURCES

The lactation data held by NBDC includes results recorded in the UK by the organisations listed below. Each of these organisations perform milk recording to the guidelines and standards defined by the International Committee for Animal Recording (ICAR).

 

The Cattle Information Service

National Milk Records Plc

Dale Farm Ltd

Isle of Man Dept. of Agriculture

Royal Jersey Agriculture & Horticulture Society

Production Trends Ayrshires (AYR)

The breed specific results,shown here, include data from breed society registered animals (both fully and supplementary) giving confidence that the statistics shown are representative of the breed. Breed results are listed in bold type in tables and thick lines on charts.

The change over time reveals how much of the progress is due to improved genetic potential, nutrition and management practices. The number of Lactations show how many full qualifying lactations were completed during the year and used in the analysis of Milk, Fat & Protein results. Calving interval (CI) and Somatic Cell Count (SCC) statistics will use slightly fewer results. The count does not equate to the number of animals registered, nor include those who may have ended their lactation below 200 days. It does however give a consistent guide to the trend in lactations recorded.

Lactation Production of Registered Animals (all ages)

Year ended Sep No. of Lactations#(AYR) Milk Yield (kg) Fat % Protein % Fat Yield (kg) Protein Yield (kg) SCC ('000 cells/ml) Calving Interval (days)
2006 10766 6832 4.07 3.30 278 226 212 415
2007 12872 6873 4.06 3.32 279 228 213 415
2008 12937 6913 4.10 3.33 283 230 204 419
2009 12854 6844 4.09 3.35 280 229 208 416
2010 12112 6944 4.11 3.32 285 230 196 418
2011 12880 7107 4.09 3.31 291 236 185 415
2012 13919 7040 4.11 3.29 289 231 196 415
2013 12893 6829 4.14 3.29 282 225 207 416
2014 12851 7037 4.10 3.31 288 233 204 416
2015 13168 6940 4.06 3.33 282 231 190 414
2016 12858 6897 4.12 3.34 284 230 176 411
2017 11894 6828 4.14 3.33 283 227 175 406
2018 11583 6923 4.15 3.32 288 230 167 404
2019 11263 7066 4.14 3.33 293 235 166 405

# Derived from animals completing a 305-day Lactiation Period. Minimum of 200 days and 5 full tests. Registered animals only.

Breed Performance Standards

(Production level required to meet the top n% of breed. Derived from LP/305-day lactations completed 2019)

Percentile Milk (kg) Fat % Protein % Fat (kg) Protein (kg) F+P (kg) C Interval
1% 11759 5.39 3.87 494 385 866 314
2% 11135 5.22 3.78 472 364 829 319
5% 10169 4.98 3.68 427 335 757 328
10% 9427 4.78 3.60 394 311 700 338
25% 8196 4.44 3.47 341 272 612 356

Values have been derived independently for each trait, so should be read and treated separately. For example, an individual cow who falls into (say) the top 25% for one trait (such as Milk Yield), may be at a very different level for another trait (such as Fat %, Protein % or Calving Interval).

Performance trends

for all registered animals

Year20062007200820092010201120122013201420152016201720182019%3.33.43.53.63.73.83.944.14.2Kg01000200030004000500060007000Fat%Protein%Milk Yield (kg)

Somatic Cell Count

Lactation Averages

Year20062007200820092010201120122013201420152016201720182019'000 cells/ml160165170175180185190195200205210215AyrshireNational/All Breeds Average

Calving Interval

annual trend

Year20062007200820092010201120122013201420152016201720182019Calving Interval (days)400405410415420425430AyrshireNational/All Breeds Average

 

Parity Group Production Ayrshires (AYR)

Parity group results are derived from all eligible lactation data within each age group.These show how first lactation heifers measure up against more mature animals, along with the relative performance of 7th, 8th and later lactation animals.These results may be particularly useful to those Farmers and Herd Owners wishing to benchmark their herd against the breed contemporaries.

The ‘Change between lactations’ column in the table below shows the increase (if positive) or decrease (if negative) in Milk Yield, between successive lactations. This indicates how much more (or less) milk might be expected from each of the different age groups in a herd and acts as a very broad guide to the effects of maturity. Individual animals may of course vary considerably from this pattern as they age themselves.

Performance of Registered Animals (Parity Groups - 2019)

Parity Lactation Count#(AYR) Milk Yield (kg) Change between lactations Fat % Protein % Fat Yield (kg) Protein Yield (kg) SCC ('000 cells/ml) Calving Interval (days)
1 3191 6233   4.18 3.34 261 208 112  
2 2494 7178 15 % 4.16 3.35 298 241 130 405
3 1812 7382 2 % 4.17 3.33 308 245 168 402
4 1433 7612 3 % 4.12 3.32 313 253 201 400
5 965 7632 0 % 4.10 3.30 313 252 215 403
6 579 7585 0 % 4.10 3.30 311 250 293 404
7 376 7407 -2 % 4.07 3.29 302 244 307 419
8 208 7344 0 % 4.03 3.27 296 240 425 424
9 108 7292 0 % 4.03 3.24 294 236 362 428
10+ 82 6539 -10 % 4.02 3.27 263 214 280 416

# Derived from animals completing a lactation period (305-days) within the year from October to Seprtember. Minimum 200 days and 5 full tests.

Lactation Milk Yields

Parity/Lactation Age12345678910+kg0100020003000400050006000700080002019

Somatic Cell Count

Parity/Lactation Age12345678910+'000 cells/ml0501001502002503003504004502019

Calving Interval

(days since previous calving)

Parity/Lactation Age12345678910+days0501001502002503003504004502019

Lactation Fat & Protein (kg)

Parity/Lactation Age12345678910+kg050100150200250300Fat 2017Fat 2018Fat 2019Protein 2017Protein 2018Protein 2019

Lactation Fat & Protein (%)

Parity/Lactation Age12345678910+%00.511.522.533.544.5Fat 2017Fat 2018Fat 2019Protein 2017Protein 2018Protein 2019

 

Genetic TREND FOR PLI

The genetic trend for the population shows the mean PLI of females per year of birth, plotted alongside the mean PLI of their sires, weighted by daughter numbers. The PLI was calculated in the latest year shown and applied to all animals dated back to the year 2000. This allows an objective comparison across time for all animals in the data set.

Genetic Trend – PLI

Mean PLI of females by year of birth, with mean PLI of their sires *

Year of Birth20062007200820092010201120122013201420152016201720182019PLI (£)-100-80-60-40-20020406080100FemalesSires

PLI results are based on the latest evaluations from AHDB.
* Sires PLI averages weighted according to the number of daughters

 

Production Trends British Friesian (BFR)

The breed specific results,shown here, include data from breed society registered animals (both fully and supplementary) giving confidence that the statistics shown are representative of the breed. Breed results are listed in bold type in tables and thick lines on charts.

The change over time reveals how much of the progress is due to improved genetic potential, nutrition and management practices.The number of Lactations show how many full qualifying lactations were completed during the year and used in the analysis of Milk, Fat & Protein results.Calving interval (CI) and Somatic Cell Count (SCC) statistics will use slightly fewer results.The count does not equate to the number of animals registered, nor include those who may have ended their lactation below 200 days. It does however give a consistent guide to the trend in lactations recorded.

Lactation Production of Registered Animals (all ages)

Year ended Sep No. of Lactations#(FRI) Milk Yield (kg) Fat % Protein % Fat Yield (kg) Protein Yield (kg) SCC ('000 cells/ml) Calving Interval (days)
2006 5534 6820 4.12 3.31 281 226 201 405
2007 6827 6761 4.09 3.34 277 226 195 402
2008 6037 6818 4.09 3.36 279 229 190 406
2009 5869 6775 4.09 3.35 277 227 185 405
2010 5372 6822 4.10 3.33 280 227 188 401
2011 5411 6965 4.07 3.33 283 232 184 401
2012 5688 6926 4.10 3.31 284 229 183 402
2013 6111 6642 4.13 3.30 274 219 188 399
2014 6545 6966 4.08 3.34 284 233 163 396
2015 6936 6889 4.06 3.36 280 232 164 394
2016 7509 6977 4.11 3.37 287 235 164 393
2017 7787 6815 4.16 3.33 283 227 154 392
2018 7978 6783 4.18 3.33 283 226 155 389
2019 8086 6777 4.14 3.37 281 228 153 389

# Derived from animals completing a 305-day Lactiation Period. Minimum of 200 days and 5 full tests. Registered animals only.

Breed Performance Standards

(Production level required to meet the top n% of breed. Derived from LP/305-day lactations completed 2019)

Percentile Milk (kg) Fat % Protein % Fat (kg) Protein (kg) F+P (kg) C Interval
1% 10977 5.36 3.94 471 368 829 309
2% 10468 5.20 3.86 446 350 792 316
5% 9707 4.92 3.75 407 324 727 325
10% 9004 4.72 3.66 377 302 674 333
25% 7892 4.42 3.52 328 266 595 349

Values have been derived independently for each trait, so should be read and treated separately. For example, an individual cow who falls into (say) the top 25% for one trait (such as Milk Yield), may be at a very different level for another trait (such as Fat %, Protein % or Calving Interval).

Performance trends

for all registered animals

Year20062007200820092010201120122013201420152016201720182019%3.33.43.53.63.73.83.944.14.2Kg01000200030004000500060007000Fat%Protein%Milk Yield (kg)

Somatic Cell Count

Lactation Averages

Year20062007200820092010201120122013201420152016201720182019'000 cells/ml150155160165170175180185190195200205210British FriesianNational/All Breeds Average

Calving Interval

annual trend

Year20062007200820092010201120122013201420152016201720182019Calving Interval (days)385390395400405410415420425430British FriesianNational/All Breeds Average

 

Parity Group Production British Friesian (BFR)

Parity group results are derived from all eligible lactation data within each age group.These show how first lactation heifers measure up against more mature animals, along with the relative performance of 7th, 8th and later lactation animals.These results may be particularly useful to those Farmers and Herd Owners wishing to benchmark their herd against the breed contemporaries.

The ‘Change between lactations’ column in the table below shows the increase (if positive) or decrease (if negative) in Milk Yield, between successive lactations. This indicates how much more (or less) milk might be expected from each of the different age groups in a herd and acts as a very broad guide to the effects of maturity. Individual animals may of course vary considerably from this pattern as they age themselves.

Performance of Registered Animals (Parity Groups - 2019)

Parity Lactation Count#(FRI) Milk Yield (kg) Change between lactations Fat % Protein % Fat Yield (kg) Protein Yield (kg) SCC ('000 cells/ml) Calving Interval (days)
1 2077 5648   4.21 3.36 238 190 99  
2 1717 6672 18 % 4.16 3.41 278 228 105 386
3 1386 7251 8 % 4.14 3.38 300 245 137 385
4 993 7418 2 % 4.11 3.37 305 250 176 386
5 717 7521 1 % 4.09 3.34 308 251 219 387
6 500 7594 0 % 4.09 3.33 310 253 259 396
7 314 7507 -1 % 4.09 3.32 307 249 285 402
8 199 7279 -3 % 4.09 3.32 298 242 276 394
9 94 6634 -8 % 4.06 3.32 270 220 368 391
10+ 88 6449 -2 % 4.06 3.27 262 211 489 411

# Derived from animals completing a lactation period (305-days) within the year from October to Seprtember. Minimum 200 days and 5 full tests.

Lactation Milk Yields

Parity/Lactation Age12345678910+kg0100020003000400050006000700080002019

Somatic Cell Count

Parity/Lactation Age12345678910+'000 cells/ml0501001502002503003504004505002019

Calving Interval

(days since previous calving)

Parity/Lactation Age12345678910+days0501001502002503003504004502019

Lactation Fat & Protein (kg)

Parity/Lactation Age12345678910+kg050100150200250300Fat 2017Fat 2018Fat 2019Protein 2017Protein 2018Protein 2019

Lactation Fat & Protein (%)

Parity/Lactation Age12345678910+%00.511.522.533.544.5Fat 2017Fat 2018Fat 2019Protein 2017Protein 2018Protein 2019

 

Genetic TREND FOR PLI

The genetic trend for the population shows the mean PLI of females per year of birth, plotted alongside the mean PLI of their sires, weighted by daughter numbers. The PLI was calculated in the latest year shown and applied to all animals dated back to the year 2000. This allows an objective comparison across time for all animals in the data set.

Genetic Trend – PLI

Mean PLI of females by year of birth, with mean PLI of their sires *

Year of Birth20062007200820092010201120122013201420152016201720182019PLI (£)-100-50050100150FemalesSires

PLI results are based on the latest evaluations from AHDB.
* Sires PLI averages weighted according to the number of daughters

 

Production Trends Brown Swiss (BSW)

The breed specific results,shown here, include data from breed society registered animals (both fully and supplementary) giving confidence that the statistics shown are representative of the breed. Breed results are listed in bold type in tables and thick lines on charts.

The change over time reveals how much of the progress is due to improved genetic potential, nutrition and management practices.The number of Lactations show how many full qualifying lactations were completed during the year and used in the analysis of Milk, Fat & Protein results.Calving interval (CI) and Somatic Cell Count (SCC) statistics will use slightly fewer results.The count does not equate to the number of animals registered, nor include those who may have ended their lactation below 200 days. It does however give a consistent guide to the trend in lactations recorded.

Lactation Production of Registered Animals (all ages)

Year ended Sep No. of Lactations#(BSW) Milk Yield (kg) Fat % Protein % Fat Yield (kg) Protein Yield (kg) SCC ('000 cells/ml) Calving Interval (days)
2006 844 7833 4.01 3.31 314 259 190 420
2007 1097 7851 4.01 3.32 315 261 206 419
2008 1180 7475 4.11 3.43 307 256 171 431
2009 1378 7387 4.05 3.45 299 255 174 421
2010 1618 7380 4.10 3.41 303 252 147 422
2011 1766 7519 4.15 3.40 312 255 158 418
2012 2056 7427 4.18 3.38 310 251 149 420
2013 2133 7137 4.17 3.38 298 241 174 418
2014 2161 7331 4.11 3.42 301 251 183 423
2015 2264 7261 4.06 3.45 295 250 189 425
2016 2302 7333 4.12 3.44 302 253 188 417
2017 2083 7257 4.10 3.43 297 249 187 417
2018 1845 7499 4.04 3.44 303 258 194 412
2019 1824 7544 3.99 3.45 301 261 167 419

# Derived from animals completing a 305-day Lactiation Period. Minimum of 200 days and 5 full tests. Registered animals only.

Breed Performance Standards

(Production level required to meet the top n% of breed. Derived from LP/305-day lactations completed 2019)

Percentile Milk (kg) Fat % Protein % Fat (kg) Protein (kg) F+P (kg) C Interval
1% 12648 5.47 4.01 501 422 928 312
2% 11887 5.23 3.94 475 404 868 318
5% 10851 4.99 3.86 442 371 803 329
10% 10115 4.74 3.77 406 345 744 337
25% 8828 4.37 3.62 354 302 655 357

Values have been derived independently for each trait, so should be read and treated separately. For example, an individual cow who falls into (say) the top 25% for one trait (such as Milk Yield), may be at a very different level for another trait (such as Fat %, Protein % or Calving Interval).

Performance trends

for all registered animals

Year20062007200820092010201120122013201420152016201720182019%3.33.43.53.63.73.83.944.14.2Kg010002000300040005000600070008000Fat%Protein%Milk Yield (kg)

Somatic Cell Count

Lactation Averages

Year20062007200820092010201120122013201420152016201720182019'000 cells/ml150160170180190200210Brown SwissNational/All Breeds Average

Calving Interval

annual trend

Year20062007200820092010201120122013201420152016201720182019Calving Interval (days)400405410415420425430Brown SwissNational/All Breeds Average

 

Parity Group Production Brown Swiss (BSW)

Parity group results are derived from all eligible lactation data within each age group.These show how first lactation heifers measure up against more mature animals, along with the relative performance of 7th, 8th and later lactation animals.These results may be particularly useful to those Farmers and Herd Owners wishing to benchmark their herd against the breed contemporaries.

The ‘Change between lactations’ column in the table below shows the increase (if positive) or decrease (if negative) in Milk Yield, between successive lactations. This indicates how much more (or less) milk might be expected from each of the different age groups in a herd and acts as a very broad guide to the effects of maturity. Individual animals may of course vary considerably from this pattern as they age themselves.

Performance of Registered Animals (Parity Groups - 2019)

Parity Lactation Count#(BSW) Milk Yield (kg) Change between lactations Fat % Protein % Fat Yield (kg) Protein Yield (kg) SCC ('000 cells/ml) Calving Interval (days)
1 376 6098   4.07 3.44 248 210 78  
2 347 7659 25 % 3.98 3.51 305 268 125 419
3 326 8137 6 % 3.97 3.46 323 281 151 411
4 280 8128 0 % 3.98 3.47 323 282 211 419
5 199 8073 0 % 3.94 3.41 318 276 244 423
6 131 7845 -2 % 4.04 3.43 317 269 358 418
7 92 7477 -4 % 4.04 3.44 302 257 319 421
8 47 7731 3 % 3.91 3.38 302 261 318 436
9 15 7570 -2 % 3.62 3.24 274 246 921 422
10+ 10 7397 -2 % 3.89 3.50 288 259 367 408

# Derived from animals completing a lactation period (305-days) within the year from October to Seprtember. Minimum 200 days and 5 full tests.

Lactation Milk Yields

Parity/Lactation Age12345678910+kg0100020003000400050006000700080002019

Somatic Cell Count

Parity/Lactation Age12345678910+'000 cells/ml010020030040050060070080090010002019

Calving Interval

(days since previous calving)

Parity/Lactation Age12345678910+days0501001502002503003504004502019

Lactation Fat & Protein (kg)

Parity/Lactation Age12345678910+kg050100150200250300350Fat 2017Fat 2018Fat 2019Protein 2017Protein 2018Protein 2019

Lactation Fat & Protein (%)

Parity/Lactation Age12345678910+%00.511.522.533.544.5Fat 2017Fat 2018Fat 2019Protein 2017Protein 2018Protein 2019

 

Genetic TREND FOR PLI

The genetic trend for the population shows the mean PLI of females per year of birth, plotted alongside the mean PLI of their sires, weighted by daughter numbers. The PLI was calculated in the latest year shown and applied to all animals dated back to the year 2000. This allows an objective comparison across time for all animals in the data set.

Genetic Trend – PLI

Mean PLI of females by year of birth, with mean PLI of their sires *

Year of Birth20062007200820092010201120122013201420152016201720182019PLI (£)-140-120-100-80-60-40-20020406080100120FemalesSires

Production Trends Guernsey (GUE)

The breed specific results,shown here, include data from breed society registered animals (both fully and supplementary) giving confidence that the statistics shown are representative of the breed. Breed results are listed in bold type in tables and thick lines on charts.

The change over time reveals how much of the progress is due to improved genetic potential, nutrition and management practices.The number of Lactations show how many full qualifying lactations were completed during the year and used in the analysis of Milk, Fat & Protein results.Calving interval (CI) and Somatic Cell Count (SCC) statistics will use slightly fewer results.The count does not equate to the number of animals registered, nor include those who may have ended their lactation below 200 days. It does however give a consistent guide to the trend in lactations recorded.

Lactation Production of Registered Animals (all ages)

Year ended Sep No. of Lactations#(GUE) Milk Yield (kg) Fat % Protein % Fat Yield (kg) Protein Yield (kg) SCC ('000 cells/ml) Calving Interval (days)
2006 2992 5598 4.62 3.52 259 197 182 417
2007 3372 5603 4.62 3.56 259 199 174 417
2008 3877 5693 4.66 3.57 265 203 189 425
2009 3201 5689 4.64 3.57 264 203 177 428
2010 2745 5927 4.71 3.61 279 210 184 420
2011 2793 5949 4.67 3.54 278 210 189 422
2012 2896 6013 4.72 3.52 284 212 180 422
2013 2853 5824 4.81 3.54 280 206 210 422
2014 2934 5884 4.81 3.57 283 210 190 419
2015 2799 5866 4.76 3.61 279 212 193 418
2016 2662 5770 4.79 3.59 277 207 209 415
2017 2420 5615 4.78 3.56 268 200 195 411
2018 2336 5625 4.80 3.55 270 200 186 415
2019 2093 5830 4.76 3.55 277 207 204 414

# Derived from animals completing a 305-day Lactiation Period. Minimum of 200 days and 5 full tests. Registered animals only.

Breed Performance Standards

(Production level required to meet the top n% of breed. Derived from LP/305-day lactations completed 2019)

Percentile Milk (kg) Fat % Protein % Fat (kg) Protein (kg) F+P (kg) C Interval
1% 9946 6.40 4.21 468 338 800 315
2% 9330 6.10 4.14 444 322 750 322
5% 8464 5.66 4.00 406 291 690 332
10% 7814 5.44 3.89 374 274 645 342
25% 6819 5.12 3.73 328 243 568 360

Values have been derived independently for each trait, so should be read and treated separately. For example, an individual cow who falls into (say) the top 25% for one trait (such as Milk Yield), may be at a very different level for another trait (such as Fat %, Protein % or Calving Interval).

Performance trends

for all registered animals

Year20062007200820092010201120122013201420152016201720182019%3.43.63.844.24.44.64.8Kg0500100015002000250030003500400045005000550060006500Fat%Protein%Milk Yield (kg)

Somatic Cell Count

Lactation Averages

Year20062007200820092010201120122013201420152016201720182019'000 cells/ml160165170175180185190195200205210GuernseyNational/All Breeds Average

Calving Interval

annual trend

Year20062007200820092010201120122013201420152016201720182019Calving Interval (days)400405410415420425430GuernseyNational/All Breeds Average

 

Parity Group Production Guernsey (GUE)

Parity group results are derived from all eligible lactation data within each age group.These show how first lactation heifers measure up against more mature animals, along with the relative performance of 7th, 8th and later lactation animals.These results may be particularly useful to those Farmers and Herd Owners wishing to benchmark their herd against the breed contemporaries.

The ‘Change between lactations’ column in the table below shows the increase (if positive) or decrease (if negative) in Milk Yield, between successive lactations. This indicates how much more (or less) milk might be expected from each of the different age groups in a herd and acts as a very broad guide to the effects of maturity. Individual animals may of course vary considerably from this pattern as they age themselves.

Performance of Registered Animals (Parity Groups - 2019)

Parity Lactation Count#(GUE) Milk Yield (kg) Change between lactations Fat % Protein % Fat Yield (kg) Protein Yield (kg) SCC ('000 cells/ml) Calving Interval (days)
1 531 5020   4.78 3.48 240 175 117  
2 517 5855 16 % 4.75 3.58 278 210 100 411
3 361 6194 5 % 4.85 3.61 301 223 167 412
4 276 6433 3 % 4.74 3.54 305 228 301 417
5 154 6357 -1 % 4.73 3.55 301 226 390 411
6 124 6121 -3 % 4.66 3.53 285 216 378 418
7 58 6151 0 % 4.62 3.57 284 219 378 423
8 34 5788 -5 % 4.72 3.53 273 204 397 429
9 24 5698 -1 % 4.53 3.49 258 199 297 433
10+ 10 4958 -12 % 4.61 3.52 229 175 350 383

# Derived from animals completing a lactation period (305-days) within the year from October to Seprtember. Minimum 200 days and 5 full tests.

Lactation Milk Yields

Parity/Lactation Age12345678910+kg010002000300040005000600070002019

Somatic Cell Count