Biomedical subjects
D D Welchman
Publications and source records attributed to D D Welchman.
Isolation and identification of Streptococcus suis serotypes 3, 4 and 7.
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An inherited congenital goitre in pigs.
A diagnosis of congenital goitre was confirmed histologically in piglets which were born hairless and swollen, and with significantly enlarged thyroid glands. The iodine content of the thyroid glands and the serum total thyroxine concentrations were very low. No evidence was found of iodine deficiency or significant goitrogenic activity in the diet fed to the sows. An investigation of the parentage of six affected litters revealed that they all had one or other of two boars as the sire, grandsire or great grandsire. The suspicion of an inherited disorder was confirmed when a test mating of a suspect carrier boar and sow resulted in the birth of two affected piglets. The ratio of the numbers of affected and unaffected piglets was statistically consistent with an autosomal recessive mode of inheritance.
Dandy-Walker malformation in lambs.
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Haematology of veal calves reared in different husbandry systems and the assessment of iron deficiency.
Calves were reared for veal and fed milk replacer either alone or with straw or dry feed of varied iron content. Measurements of haematology and iron biochemistry were made at the start of the rearing period and before slaughter at 16 to 20 weeks of age. When the total dietary iron intake rose to approximately 12,500 mg (an average of 112 mg/dl, approximately 60 mg/kg dry matter) haemoglobin concentration reached a mean value (+/- sd) of 12.4 +/- 1.1 g/dl, similar to control calves. There was no further increase in haemoglobin when more iron was fed, indicating that there was sufficient iron in the diet for normal erythropoiesis. The borderline of iron deficiency anaemia at 16 to 20 weeks of age was defined as a haemoglobin concentration of 9 g/dl and a saturation of total iron binding capacity of 10 per cent. There was evidence of diurnal variation in serum iron concentration in calves fed in a periodic manner. The feeding of straw to veal calves did not prevent iron deficient erythropoiesis.
A survey of abomasal ulceration in veal calves.
Abomasal ulceration was found in 264 of 304 commercially reared veal calves at slaughter. The incidence and severity of lesions were greatest in loose housed calves with access to straw and fed milk substitute ad libitum. The majority of lesions were located in the distal pylorus. There was no evidence that the abomasal erosions and ulcers found in the majority of veal calves affected their growth rate or were deleterious to their welfare. It is suggested that pyloric ulceration may be related to the diet of veal calves.