Irish Veterinary Journal

Table 4 Comparison of distributions of unusable and usable monthly volume and SCC records - annually and monthly

From: The impact of removal of the seasonality formula on the eligibility of Irish herds to supply raw milk for processing of dairy products

Period	SCC			Monthly volume
Period	Number of unusable records^a	Number of usable records^a	p-value^b	Number of unusable records^a	Number of usable records^a	p-value^b
Annual	102810	71815	<0.001	103391	73245	<0.001
Monthly
January	4237	4157	<0.001	4366	4169	<0.001
February	8391	5822	<0.001	8445	5838	<0.001
March	9426	6386	<0.001	9462	6400	<0.001
April	9641	6469	0.002	9665	6478	<0.001
May	9684	6307	0.007	9711	6487	<0.001
June	9673	6318	<0.001	9707	6487	<0.001
July	9665	6300	<0.001	9687	6459	<0.001
August	9638	6284	<0.001	9682	6468	<0.001
September	9615	6321	<0.001	9641	6476	<0.001
October	9630	6307	0.005	9662	6469	0.003
November	8845	6222	<0.001	8931	6405	<0.001
December	4365	4922	0.009	4432	5109	<0.001

^aRecords with or without a national herd identifier were termed usable or unusable data, respectively
^bA p-value of <0.05 indicates there is no evidence to suggest the distribution of the usable and all records are the same

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ISSN: 2046-0481

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