Bacillary white diarrhoea : results of testing a breeding flock / by T. Dalling, J.H. Maosn, and W.S, Gordon.

  • Dalling, Thomas.
Date:
[1927?]
Catalogue details

Licence: In copyright

Credit: Bacillary white diarrhoea : results of testing a breeding flock / by T. Dalling, J.H. Maosn, and W.S, Gordon. Source: Wellcome Collection.

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    Extract from w THE VETERINARY RECORD —^...——r- ]- ■ t ■„ 'tf—imn Mtr-- n nm Tr ini i ■ .. unm-i.i -rrmn Tm--rf r No. 33, August 13th, 1927. vrol. 7, BACILLARY WHITE DIARRHOEA : RESULTS OP TESTING A BREEDING FLOCK 3Y t* Dalling, M.E.C.V.S., J. H. and W. S. Gordon, M.R.C.V.S., Bee Icenham, Kent. Mason, M,R.C.V.S Langley Court, j In November, 1926, poultry farmer A. contracted to buy from B. several thousand eggs for hatching. Prior to the delivery of this large consignment, 150 eggs were incubated and several chicks died from B.W.D. (bacillus isolated and identified by laboratory tests)* Incubation was carried out in the usual way, a Mammoth incubator being used, and the following is the result of the hatchings and the mortality from B.W.D. up to the 28th day. after which no records were kept. Lot of No. chicks chick3. hatched. $ hatched. died A. 1,263 70 42 B. 340 69 63 C. 900 69 59 D. 500 65 57 E, 173 65 71 P. 100 65 29 G. 1,466 67 18 H. 605 58 28 I. 2, 518 75 36 B.W.D. was confirmed by laboratory tests on several chicks in each lot. The percentage death rate includes chicks killed by farmer A. who did not wait till chicks actually died but killed all ailing birds whenever noticed. B.W.D. did not exist on farm A. previous to the 1926 hatching. On two occasions all unhatched eggs were sent to the labora¬ tory for examination. Lot 1 consisted of 130 eggs, of which 59 were non- fertile and 71 contained dead chicks in varying stages of development. Cultures were made from the contents of all eggs, and from 25 B. pullorum was isolated. Lot 2 consisted of 143 eggs, of which 68 were non-fertile and 75 contained dead chicks. Cultures of 3. pullorum were isolated from the contents of 30 eggs. ~ ~~ On farm B. intradermic (I.D, ) and agglutination (Agg. ) tests were carried out on 645 hens which had produced the eggs hatched by farmer