2-Input-data/2.3-Animal-Numbers.md

@@ -28,7 +28,7 @@ The official goat-population figures available for 2010, 2013, 2016 and 2020 wer
 
 In the inventory, horse numbers are subdivided into the two categories "heavy horses" and "light horses and ponies", to take account of the differences in emissions behaviour between the two categories. Since the agricultural census 2010 numbers of equids, rather than numbers of horses, were counted. The equid figures inseparable include the counts for mules and asses. Hence, as of the 2015 submission, the inventory no longer includes "mules and asses" as a separate category; until the year 2009, the counts for mules and asses were added to the counts for light horses and ponies. In keeping with data of the INTERESSENGEMEINSCHAFT FÜR ESEL UND MAULTIERE (Interest assocation for mules and asses – IGEM) (personal communication, B. Schmutz, 28 Sept 2009) the applicable number for mules and asses has been estimated at 8,500 mules and asses. Data gaps within the time series of the animal numbers are closed by linear interpolation. The animal numbers for 2021 and 2022 are estimated by extrapolating the trend between 2016 and 2020.
 
-In official surveys including 2007, pullets up to the age of six months were counted, although in common husbandry practice pullets are considered laying hens when they complete their 18th week of life. For the inventory, therefore, a fraction of the pullets was shifted into the laying-hen category up to and including the year 2007. At the same time, the total sum of pullets and laying hens was not changed. The next official survey after 2007 took place in 2010. As of this survey the animal number shifting between both categories is no longer needed as the animals are now counted according to husbandry practice. However, the number of laying hens, pullets and broilers in the years before 2013 are corrected upwards to avoid the unrealistic trend of the official figures between 2010 and 2013 (see above). The correction was carried out for the animal categories of laying hens, pullets and broilers in the state of Lower Saxony, as the large farms that were not included in the poultry censuses until 2013 are almost exclusively located in Lower Saxony. In a first step, the number of poultry for 2010 was corrected by assuming the trend between the survey years 2013 and 2016 for the period between the survey years 2010 and 2013. The poultry number determined in this way for 2010 was assumed to be true and the factor f2010 between the corrected and the recorded number of poultry in 2010 was determined. f2010 is around 1.6, 2.2 and 1.8 for laying hens, pullets and broilers, respectively. The poultry numbers collected for 1990 were assumed to be true because there were probably no large farms that were not included in the statistics at that time. For the year 1990, the factor f1990 between the corrected and recorded poultry numbers is 1. For the survey years in between (1992, 1994, 1996, 1999, 2003 and 2007), corresponding factors were created by linear interpolation between 1 (f1990) and f2010 and the number of animals collected was multiplied by the respective factor.
+In official surveys until 2007, pullets up to the age of six months were counted, although in common husbandry practice pullets are considered laying hens when they complete their 18th week of life. For the inventory, therefore, a fraction of the pullets was shifted into the laying-hen category up to and including the year 2007. At the same time, the total sum of pullets and laying hens was not changed. The next official survey after 2007 took place in 2010. As of this survey the animal number shifting between both categories is no longer needed as the animals are now counted according to husbandry practice. However, the number of laying hens, pullets and broilers in the years before 2013 are corrected (according to [IPCC(2006a)](https://git-dmz.thuenen.de/vos/emissionsagriculture2024/-/wikis/9%20Literature#ipcc-intergovernmental-panel-on-climate-change-2006a) Vol.1 Chapter 5) upwards to avoid the unrealistic trend of the official figures between 2010 and 2013 resulting from the fact that some poultry farms had not been surveyed before 2013. The correction was carried out for the animal categories of laying hens, pullets and broilers in the state of Lower Saxony, as the large farms that were not included in the poultry censuses until 2013 are almost exclusively located in Lower Saxony. In a first step, the number of poultry for 2010 was corrected by assuming the trend between the survey years 2013 and 2016 for the period between the survey years 2010 and 2013. The poultry number determined in this way for 2010 was assumed to be true and the factor f2010 between the corrected and the recorded number of poultry in 2010 was determined. f2010 is approximately 1.6, 2.2 and 1.8 for laying hens, pullets and broilers, respectively. The poultry numbers collected for 1990 were assumed to be true because there were probably no large farms that were not included in the statistics at that time. For the year 1990, the factor f1990 between the corrected and recorded poultry numbers is therefore 1. For the survey years in between (1992, 1994, 1996, 1999, 2003 and 2007), corresponding factors were created by linear interpolation between 1 (f1990) and f2010 and the number of animals collected was multiplied by the respective factor.
 
 For all poultry categories the data gaps in the time series are closed by linear interpolation. For 2021 and 2022 the 2020 figures have been maintained, as extrapolation of trends between 2016 and 2020 would have led, at least in part, to implausible (partly negative) animal numbers in the next few years. For laying hens, the figures of 2021 and 2022 were estimated on the basis of the 2020 figures and the trends of data published by the Federal Statistical Office on number of housing places (see [Genesis data base](/9-Literature#statistisches-bundesamt)).