TAILIEUCHUNG - Black's veterinary dictionary 21st edition - D

Từ điển thú y vần D | D D-Value This is the percentage of digestible organic matter in the dry matter of the feed. D-value is used to assess or describe the digestibility of animal feeds such as dried grass hay silage etc. Daft Lambs Those affected with cerebellar atrophy a condition associated with incoordination of head and leg movements. The lambs are normal at birth but have problems walking there is incoordination of limbs straddled leg stance head arched backwards and muscle tremors. It is to due to a recessive gene. See GENETICS Genetic defects. Dachsunds Small long-bodied breed of dog with very short legs originating in Germany where they were used for badger hunting. The long body makes them prone to intervertebral disc problems. They are also liable to inherit cleft palate deafness diabetes mellitus and un-united anconeal process. Distichiasis is seen in the miniature long-haired dachsund. Over-shot jaw and progressive renal atrophy may be congenital. Dagging Removal of soiled wool by the shepherd from sheeps hindquarters as an aid to preventing STRIKE. Dairy Herd Management In 1970 herd size averaged only 30 in the UK and 80 per cent of cows were still tied up in cowsheds. There was however a growing movement towards larger herds and many of those which formerly were 50 to 70 cows became 90 to 120 in size today there are several 300-cow units and a few larger still. The imposition of milk quotas by the EU led to herd sizes becoming static but numbers are again increasing. Increase in herd size has been accompanied by other changes notably milking in a parlour and housing in a cubicle house instead of in a cowshed. See CUBICLES FOR COWS COW KENNELS. There has been a tendency to replace the tandem parlour by the herringbone. See illustration. Parlour feeding is now in up-to-date units related automatically to milk yield this Milking in a rotary herringbone parlour. 170 Dalmation both makes for economy and avoids the problem of cow identification in the big herd so far as the .

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