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Heard-health-parameters Dairy Herds Calculating Workability
Comparison of Different Heard-health-parameters used in Dairy Herds concerning algorithm of Calculating and Workability
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Heard-Health-Parameters
No Single-Health-Parameters concerning one animal (Temp, Heart Rate, Respiratory Rate, Milk Yield measured on a day or longer period, Calving interval, Time to first service, SCC) Concerning more animals in a herd (Culling Rate, Service Rate, Conception Rate, Pregnancy efficiency, Cows pregnant)
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Workability Making sense Unique Fast Low Costs
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Milk Yield Fertility Longevity Milk Quality
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Milk Animals Fertility Longevity Udder Health Metabolism sold
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Relation Amount a Amount b
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Proportion Part amount a Whole amount a
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Average
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Does only make sense as a stock variable
Average and Time Average Time Does only make sense as a stock variable
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Events as Relation or Proportion
Time
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Which fertility parameter make sense?
Calving interval “In-Calf-Rates” Conception rate Submission rate
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Calving Interval Can a herd have a calving interval?
Single cow parameter How we can transform it to a herd parameter? Mean calving interval? Which cows in a herd? heifers? how we can put it in relation to a time period?
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What we look upon as fertility?
Amount of cows calving in a period of time? end of the pregnancies Amount of cows conceiving in a period of time? start of the pregnancies How to put it in relation to herdspecific parameters? Eligible, herdsize How to put it in relation to time. Which calendar? Gregorian, 21 day period
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The event time relationship
Rates, Flow variables, events per time telling you what happens in a period of time Possible events start of the pregnancies, served cows, culled cows Gregorian calendar Months 28 – 31 days, quarter 60 – 62 days, year 365 to 366 days 21 day period different calenders, or periods in a year.
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Pregnancy Rate 21 day period
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Pregnancy Rate Monthly
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Fertility Events Relations Conceptions (start of pregnancy) Services
Conceptions/Services /Time Conceptions/ Herdsize/Time
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Stock variables in a time period
Herd size in February 2016: days. 10 days x 100 cows, 10 days x 98 cows, 9 days x 101 cows cow days/29 days = 99.62 Cow days, heifer days, cow <= 63 days in lactation days, cow eligible to breed days start of the pregnancies, served cows, culled cows
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The 21 day period 17 periods in a year confusing: days x 101 cows cow days/29 days = 99.62 How to get the 21 day period character?
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A cow counts every 21 days as 1 eligible cow.
Usual calculation: cow 21 days in February 2017 counts 21/29 = 0.72 How to get the 21 day period character? cow 21 days in February 2017 counts 21/29 * 29/21 = 1
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January 31 days Cow days Counts Cow 15 0.71 Cow 5 0.24 Cow 21 1
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“In calf rates cumulative”
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“In calf rates to DIM”
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Rates: Culling Rates (all cows, cows -42, cows -64, calves -21 days, youngstock 12 to 56 weeks) Fertility Rates (pregnancy rate, pregnancy efficiency, submission rate, conception rate, fertility rate) Udder health Rates (scc per month, -new infections, cured –during lactations and over dry period) Metabolism Rates (Milk per cow and day in lactation stages Percentage Fat content higher 5.1 percent -42 Dim, -84 Dim)
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Fertility Pregnancy Rate Service/Mating Rate Conception Rate
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Concieved /Time! Served Eligibles
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Time Pregnancy Rate Eligible to conceive Conceptions served served
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Pregnancy rate Conceptions Eligible to conceive Time
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Fertility Rate Conceptions Cow Herd Size Time
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Submission Rate Served Eligible to conceive Time
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Conception Rate Conceptions Served Time
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Fertility Rate Yearly
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Fertility Rate Quarterly
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Fertility Rate Monthly
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Eligible Rates Yearly
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Eligible Rates Quarterly
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Eligible Rates Monthly
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Udder health parameter
SCC average values Proportion Infected Infection history lactation dry Period When a cow deems as infected?
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When a cow deems as infected?
140 k/ml in USA 200 k/ ml in UK 100 k/ ml in Germany On from 100 k/ml composition changes On from 120 k/ml no hard cheese
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Culling Parameters Cows: lactation, lactation-stage
Youngstock: Grouping in ages Breeds, Genetics
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The meaning of workable Herd-Health-Parameters
Making decisions on farm Making conclusions in research
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Meaningful, unique, fast and low cost
Purchase software packages (check the criteria) Do a lot yourself (with some training and some IT-Tools)
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How to do it? Microsoft Office
Use some software tools that control Microsoft Office to calculate the figures and prepare the graphs.
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PDF CDL FILES MS Access More than hundred in one go in minutes
BCMS Data BCMS Data More than hundred in one go in minutes CDL FILES PDF MS Access MS EXCEL Download many in one go Farmers Data Farmers Data Vets Data Vets Data
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