New Zealand Dairy Statistics 2014-15

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The distribution of estimated 6-week in-calf rates is tighter than the actual results reflecting that estimates tend towards the mean. This is because estimates for low performing herds tend to be overestimated while estimates for high performing herds tend to be underestimated. In 2014/15, 50% of herds had an estimated 6-week in-calf rate of 65% or higher and 10% of these herds had an estimated 6-week in-calf rate of 71% or higher (Table 4.12). Ten per cent of herds had an in-calf rate of 55% or lower. Table 4.12: Estimated 6-week in-calf rate in 2014/15 Number of herds Median Top 10% Top 25% Bottom 25% Bottom 10% 6-week in-calf rate 3,918 65 >71 >69
E. Calving i) Planned start of calving and median calving dates The trend in calving dates within and between regions is best shown by the “planned start of calving” date. The planned start of calving date is 282 days from the date that mating is started in the herd. The farmer has control over, and the ability to change, the start of mating. Mating and calving information is recorded on the LIC Herd Improvement Database for approximately 85% of all herds. Calving spread can be controlled to some degree by farm management (for example, cow condition score at calving, level of nutrition in the four to six weeks prior to mating, and the use of CIDR devices and other reproductive technology). The actual start of calving can be meaningless, since the first calving in a herd can be premature, occurring well before the rest of the herd calves. Hence the median calving date (the date that occupies the middle position after the dates are arranged in ascending order) is used as an indicator of actual calving spread. The forecast planned start of calving and actual median calving dates for cows (excluding first calvers) for the 2014/15 season are shown in Graph 4.14. Graph 4.14: Planned start of calving and median calving dates for cows (excluding first calvers) by region 30 Aug 20 Aug 10 Aug Date 31 Jul 21 Jul 11 Jul 1 Jul Northland Waikato Bay of Plenty/ East Coast Taranaki Manawatu/ Wairarapa Region Tasman/ Westland Planned start of calving 2015/16 Median calving 2014/15 Marlborough/ Canterbury Otago/ Southalnd The planned start of calving for five-yearly intervals since 2000/01 is shown in Graph 4.15. The trend is for an earlier planned start of calving compared with five and ten years ago. New Zealand Dairy Statistics 2014-15 41
Page 1 and 2: New Zealand Dairy Statistics 2014-1
Page 3 and 4: Contents 1. Introduction 4 2. Natio
Page 5 and 6: List of graphs 2.1 Trend in the num
Page 7 and 8: 2. National dairy statistics A. Ind
Page 9 and 10: The total cow population in the 201
Page 11 and 12: i) Production per cow and per hecta
Page 13 and 14: ii) Herd size distribution • 12%
Page 15 and 16: 3. Regional dairy statistics A. Reg
Page 17 and 18: • Highest average production reco
Page 19 and 20: (table 3.3 continued) Region Distri
Page 21 and 22: (table 3.4 continued) Region Distri
Page 23 and 24: Herd production in each of the main
Page 25 and 26: Table 3.10 shows the number and per
Page 27 and 28: 4. Herd improvement A. Use of herd
Page 29 and 30: B. Herd test averages The lactation
Page 31 and 32: ii) Monthly averages • Highest av
Page 33 and 34: iii) Breed category averages • Ho
Page 35 and 36: C. Artificial Breeding (AB) statist
Page 37 and 38: In 2014/15 the average number of in
Page 39 and 40: The percentage of inseminations for
Page 41: Mean actual 6-week in-calf rate ran
Page 45 and 46: F. Animal Evaluation The genetic me
Page 47 and 48: ii) Cow Evaluations The Breeding Wo
Page 49 and 50: The genetic trend for cows is based
Page 51 and 52: 5. Prices received A. Milk prices U
Page 53 and 54: 6. Disease Control A. Tuberculosis

New Zealand Dairy Statistics 2014-15

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