Reduction in milk yield associated with Mycobacterium avium subspecies paratuberculosis Map infection in dairy cowsReport as inadecuate




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Abstract : To assess the profitability of control schemes for Mycobacterium avium subspecies paratuberculosis Map-infection implemented in dairy herds, accurate estimates of its production effects are needed. This study aimed at quantifying the variation in milk yield of dairy cows according to their Map-infection status. The cow-status was determined by combining i its testings-results serum ELISA, faecal culture FC, PCR, Ziehl staining, ii the Map-status of its herd, and iii its possible vaccination against Map. A total of 15 490 cows in 569 herds located in western France was considered. The effect on test-day milk yield TDMY of the cow-status to Map was assessed separately in parity 1, 2 and 3 or more, using mixed linear models, after adjustment for herd-season random, days in milk and breed. Average TDMY was significantly lower in cows from herds with at least one Map-infected cow defined as positive herds. Individual TDMY showed a reduction ranging from 1.58 to 3.30, 2.03 to 2.51, 5.36 to 7.20 kg-day $P$ $



Author: François Beaudeau Maud Belliard Alain Joly Henri Seegers

Source: https://hal.archives-ouvertes.fr/



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