By Frerking, H., Praktische Tierarzt, 1999
Description
Between 1958 and 1997, 13 713 649 cows in the district of Hannover, Germany, were involved in a milk recording programme for _1 year. 4 205 027 (30.27%) of these animals were culled during this period. Fertility problems (29.88%) were the main reason for culling, followed by farm closure (23.61%), low milk yield (11.66%), sale of breeding cows (9.18%), mastitis (8.60%), lameness (4.50%), other diseases (4.49%) and poor milkability (1.85%). 5.87% of the cows were slaughtered because of age. During this study, the number of cows/farm increased from 7.8 to 36.5%, the proportion of cows involved in milk recording increased from 57.1 to 82%, the average milk yield increased from 4292 to 7285 kg/year and milk fat yield from 161 to 311 kg. Over the last 20 years, milk protein yield increased from 203 to 245 kg
Between 1958 and 1997, 13 713 649 cows in the district of Hannover, Germany, were involved in a milk recording programme for _1 year. 4 205 027 (30.27%) of these animals were culled during this period. Fertility problems (29.88%) were the main reason for culling, followed by farm closure (23.61%), low milk yield (11.66%), sale of breeding cows (9.18%), mastitis (8.60%), lameness (4.50%), other diseases (4.49%) and poor milkability (1.85%). 5.87% of the cows were slaughtered because of age. During this study, the number of cows/farm increased from 7.8 to 36.5%, the proportion of cows involved in milk recording increased from 57.1 to 82%, the average milk yield increased from 4292 to 7285 kg/year and milk fat yield from 161 to 311 kg. Over the last 20 years, milk protein yield increased from 203 to 245 kg
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